2016-10-14 03:00:27

by Peter Chen

Subject: [PATCH v8 0/8] power: add power sequence library

Hi all,

This is a follow-up for my last power sequence framework patch set [1].
According to Rob Herring and Ulf Hansson's comments[2]. The kinds of
power sequence instances will be added at postcore_initcall, the match
criteria is compatible string first, if the compatible string is not
matched between dts and library, it will try to use generic power sequence.

The host driver just needs to call of_pwrseq_on/of_pwrseq_off
if only one power sequence instance is needed, for more power sequences
are used, using of_pwrseq_on_list/of_pwrseq_off_list instead (eg, USB hub driver).

In future, if there are special power sequence requirements, the special
power sequence library can be created.

This patch set is tested on i.mx6 sabresx evk using a dts change, I use
two hot-plug devices to simulate this use case, the related binding
change is updated at patch [1/6], The udoo board changes were tested
using my last power sequence patch set.[3]

Except for hard-wired MMC and USB devices, I find the USB ULPI PHY also
need to power on itself before it can be found by ULPI bus.

[1] http://www.spinics.net/lists/linux-usb/msg142755.html
[2] http://www.spinics.net/lists/linux-usb/msg143106.html
[3] http://www.spinics.net/lists/linux-usb/msg142815.html

Changes for v8:
- Allocate one extra pwrseq instance if pwrseq_get has succeed, it can avoid
preallocate instances problem which the number of instance is decided at
compile time, thanks for Heiko Stuebner's suggestion [Patch 2/8]
- Delete pwrseq_compatible_sample.c which is the demo purpose to show compatible
match method. [Patch 2/8]
- Add Maciej S. Szmigiero's tested-by. [Patch 7/8]

Changes for v7:
- Create kinds of power sequence instance at postcore_initcall, and match
the instance with node using compatible string, the beneit of this is
the host driver doesn't need to consider which pwrseq instance needs
to be used, and pwrseq core will match it, however, it eats some memories
if less power sequence instances are used. [Patch 2/8]
- Add pwrseq_compatible_sample.c to test match pwrseq using device_id. [Patch 2/8]
- Fix the comments Vaibhav Hiremath adds for error path for clock and do not
use device_node for parameters at pwrseq_on. [Patch 2/8]
- Simplify the caller to use power sequence, follows Alan's commnets [Patch 4/8]
- Tested three pwrseq instances together using both specific compatible string and
generic libraries.

Changes for v6:
- Add Matthias Kaehlcke's Reviewed-by and Tested-by. (patch [2/6])
- Change chipidea core of_node assignment for coming user. (patch [5/6])
- Applies Joshua Clayton's three dts changes for two boards,
the USB device's reg has only #address-cells, but without #size-cells.

Changes for v5:
- Delete pwrseq_register/pwrseq_unregister, which is useless currently
- Fix the linker error when the pwrseq user is compiled as module

Changes for v4:
- Create the patch on next-20160722
- Fix the of_node is not NULL after chipidea driver is unbinded [Patch 5/6]
- Using more friendly wait method for reset gpio [Patch 2/6]
- Support multiple input clocks [Patch 2/6]
- Add Rob Herring's ack for DT changes
- Add Joshua Clayton's Tested-by

Changes for v3:
- Delete "power-sequence" property at binding-doc, and change related code
at both library and user code.
- Change binding-doc example node name with Rob's comments
- of_get_named_gpio_flags only gets the gpio, but without setting gpio flags,
add additional code request gpio with proper gpio flags
- Add Philipp Zabel's Ack and MAINTAINER's entry

Changes for v2:
- Delete "pwrseq" prefix and clock-names for properties at dt binding
- Should use structure not but its pointer for kzalloc
- Since chipidea core has no of_node, let core's of_node equals glue
layer's at core's probe

Joshua Clayton (2):
ARM: dts: imx6qdl: Enable usb node children with <reg>
ARM: dts: imx6q-evi: Fix onboard hub reset line

Peter Chen (6):
binding-doc: power: pwrseq-generic: add binding doc for generic power
sequence library
power: add power sequence library
binding-doc: usb: usb-device: add optional properties for power
sequence
usb: core: add power sequence handling for USB devices
usb: chipidea: let chipidea core device of_node equal's glue layer
device of_node
ARM: dts: imx6qdl-udoo.dtsi: fix onboard USB HUB property

.../bindings/power/pwrseq/pwrseq-generic.txt | 48 ++++++
.../devicetree/bindings/usb/usb-device.txt | 10 +-
MAINTAINERS | 9 +
arch/arm/boot/dts/imx6q-evi.dts | 25 +--
arch/arm/boot/dts/imx6qdl-udoo.dtsi | 26 ++-
arch/arm/boot/dts/imx6qdl.dtsi | 6 +
drivers/power/Kconfig | 1 +
drivers/power/Makefile | 1 +
drivers/power/pwrseq/Kconfig | 19 ++
drivers/power/pwrseq/Makefile | 2 +
drivers/power/pwrseq/core.c | 191 +++++++++++++++++++++
drivers/power/pwrseq/pwrseq_generic.c | 183 ++++++++++++++++++++
drivers/usb/chipidea/core.c | 27 ++-
drivers/usb/core/hub.c | 41 ++++-
drivers/usb/core/hub.h | 1 +
include/linux/power/pwrseq.h | 72 ++++++++
16 files changed, 621 insertions(+), 41 deletions(-)
create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
create mode 100644 drivers/power/pwrseq/Kconfig
create mode 100644 drivers/power/pwrseq/Makefile
create mode 100644 drivers/power/pwrseq/core.c
create mode 100644 drivers/power/pwrseq/pwrseq_generic.c
create mode 100644 include/linux/power/pwrseq.h

--
2.7.4

2016-10-14 03:00:51

by Peter Chen

Subject: [PATCH v8 2/8] power: add power sequence library

We have an well-known problem that the device needs to do some power
sequence before it can be recognized by related host, the typical
example like hard-wired mmc devices and usb devices.

This power sequence is hard to be described at device tree and handled by
related host driver, so we have created a common power sequence
library to cover this requirement. The core code has supplied
some common helpers for host driver, and individual power sequence
libraries handle kinds of power sequence for devices. The pwrseq
librares always need to allocate extra instance for compatible
string match.

pwrseq_generic is intended for general purpose of power sequence, which
handles gpios and clocks currently, and can cover other controls in
future. The host driver just needs to call of_pwrseq_on/of_pwrseq_off
if only one power sequence is needed, else call of_pwrseq_on_list
/of_pwrseq_off_list instead (eg, USB hub driver).

For new power sequence library, it can add its compatible string
to pwrseq_of_match_table, then the pwrseq core will match it with
DT's, and choose this library at runtime.

Signed-off-by: Peter Chen <[email protected]>
Tested-by Joshua Clayton <[email protected]>
Reviewed-by: Matthias Kaehlcke <[email protected]>
Tested-by: Matthias Kaehlcke <[email protected]>
---
MAINTAINERS | 9 ++
drivers/power/Kconfig | 1 +
drivers/power/Makefile | 1 +
drivers/power/pwrseq/Kconfig | 19 ++++
drivers/power/pwrseq/Makefile | 2 +
drivers/power/pwrseq/core.c | 191 ++++++++++++++++++++++++++++++++++
drivers/power/pwrseq/pwrseq_generic.c | 183 ++++++++++++++++++++++++++++++++
include/linux/power/pwrseq.h | 72 +++++++++++++
8 files changed, 478 insertions(+)
create mode 100644 drivers/power/pwrseq/Kconfig
create mode 100644 drivers/power/pwrseq/Makefile
create mode 100644 drivers/power/pwrseq/core.c
create mode 100644 drivers/power/pwrseq/pwrseq_generic.c
create mode 100644 include/linux/power/pwrseq.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 3bb6640..7e1fcb9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9384,6 +9384,15 @@ F: include/linux/pm_*
F: include/linux/powercap.h
F: drivers/powercap/

+POWER SEQUENCE LIBRARY
+M: Peter Chen <[email protected]>
+T: git git://git.kernel.org/pub/scm/linux/kernel/git/peter.chen/usb.git
+L: [email protected]
+S: Maintained
+F: Documentation/devicetree/bindings/power/pwrseq/
+F: drivers/power/pwrseq/
+F: include/linux/power/pwrseq.h/
+
POWER SUPPLY CLASS/SUBSYSTEM and DRIVERS
M: Sebastian Reichel <[email protected]>
M: Dmitry Eremin-Solenikov <[email protected]>
diff --git a/drivers/power/Kconfig b/drivers/power/Kconfig
index acd4a15..f6aa4fd 100644
--- a/drivers/power/Kconfig
+++ b/drivers/power/Kconfig
@@ -515,3 +515,4 @@ endif # POWER_SUPPLY

source "drivers/power/reset/Kconfig"
source "drivers/power/avs/Kconfig"
+source "drivers/power/pwrseq/Kconfig"
diff --git a/drivers/power/Makefile b/drivers/power/Makefile
index e46b75d..4ed2e12 100644
--- a/drivers/power/Makefile
+++ b/drivers/power/Makefile
@@ -74,3 +74,4 @@ obj-$(CONFIG_CHARGER_TPS65217) += tps65217_charger.o
obj-$(CONFIG_POWER_RESET) += reset/
obj-$(CONFIG_AXP288_FUEL_GAUGE) += axp288_fuel_gauge.o
obj-$(CONFIG_AXP288_CHARGER) += axp288_charger.o
+obj-$(CONFIG_POWER_SEQUENCE) += pwrseq/
diff --git a/drivers/power/pwrseq/Kconfig b/drivers/power/pwrseq/Kconfig
new file mode 100644
index 0000000..3859a67
--- /dev/null
+++ b/drivers/power/pwrseq/Kconfig
@@ -0,0 +1,19 @@
+#
+# Power Sequence library
+#
+
+config POWER_SEQUENCE
+ bool
+
+menu "Power Sequence Support"
+
+config PWRSEQ_GENERIC
+ bool "Generic power sequence control"
+ depends on OF
+ select POWER_SEQUENCE
+ help
+ It is used for drivers which needs to do power sequence
+ (eg, turn on clock, toggle reset gpio) before the related
+ devices can be found by hardware. This generic one can be
+ used for common power sequence control.
+endmenu
diff --git a/drivers/power/pwrseq/Makefile b/drivers/power/pwrseq/Makefile
new file mode 100644
index 0000000..ad82389
--- /dev/null
+++ b/drivers/power/pwrseq/Makefile
@@ -0,0 +1,2 @@
+obj-$(CONFIG_POWER_SEQUENCE) += core.o
+obj-$(CONFIG_PWRSEQ_GENERIC) += pwrseq_generic.o
diff --git a/drivers/power/pwrseq/core.c b/drivers/power/pwrseq/core.c
new file mode 100644
index 0000000..9cb1223
--- /dev/null
+++ b/drivers/power/pwrseq/core.c
@@ -0,0 +1,191 @@
+/*
+ * core.c power sequence core file
+ *
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Author: Peter Chen <[email protected]>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/slab.h>
+#include <linux/power/pwrseq.h>
+
+static DEFINE_MUTEX(pwrseq_list_mutex);
+static LIST_HEAD(pwrseq_list);
+
+int pwrseq_get(struct device_node *np, struct pwrseq *p)
+{
+ if (p && p->get)
+ return p->get(np, p);
+
+ return -ENOTSUPP;
+}
+EXPORT_SYMBOL_GPL(pwrseq_get);
+
+int pwrseq_on(struct pwrseq *p)
+{
+ if (p && p->on)
+ return p->on(p);
+
+ return -ENOTSUPP;
+}
+EXPORT_SYMBOL_GPL(pwrseq_on);
+
+void pwrseq_off(struct pwrseq *p)
+{
+ if (p && p->off)
+ p->off(p);
+}
+EXPORT_SYMBOL_GPL(pwrseq_off);
+
+void pwrseq_put(struct pwrseq *p)
+{
+ if (p && p->put)
+ p->put(p);
+}
+EXPORT_SYMBOL_GPL(pwrseq_put);
+
+int pwrseq_suspend(struct pwrseq *p)
+{
+ if (p && p->suspend)
+ return p->suspend(p);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pwrseq_suspend);
+
+int pwrseq_resume(struct pwrseq *p)
+{
+ if (p && p->resume)
+ return p->resume(p);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pwrseq_resume);
+
+void pwrseq_register(struct pwrseq *pwrseq)
+{
+ mutex_lock(&pwrseq_list_mutex);
+ list_add(&pwrseq->node, &pwrseq_list);
+ mutex_unlock(&pwrseq_list_mutex);
+}
+EXPORT_SYMBOL_GPL(pwrseq_register);
+
+void pwrseq_unregister(struct pwrseq *pwrseq)
+{
+ mutex_lock(&pwrseq_list_mutex);
+ list_del(&pwrseq->node);
+ mutex_unlock(&pwrseq_list_mutex);
+}
+EXPORT_SYMBOL_GPL(pwrseq_unregister);
+
+static struct pwrseq *pwrseq_find_available_instance(struct device_node *np)
+{
+ struct pwrseq *pwrseq;
+
+ list_for_each_entry(pwrseq, &pwrseq_list, node) {
+ if (pwrseq->used)
+ continue;
+
+ /* compare compatible string for pwrseq node */
+ if (of_match_node(pwrseq->pwrseq_of_match_table, np)) {
+ pwrseq->used = true;
+ return pwrseq;
+ }
+
+ /* return generic pwrseq instance */
+ if (!strcmp(pwrseq->pwrseq_of_match_table->compatible,
+ "generic")) {
+ pr_debug("using generic pwrseq instance for %s\n",
+ np->full_name);
+ pwrseq->used = true;
+ return pwrseq;
+ }
+ }
+ pr_warn("Can't find any pwrseq instances for %s\n", np->full_name);
+
+ return NULL;
+}
+
+struct pwrseq *of_pwrseq_on(struct device_node *np)
+{
+ struct pwrseq *pwrseq;
+ int ret;
+
+ pwrseq = pwrseq_find_available_instance(np);
+ if (!pwrseq)
+ return ERR_PTR(-ENONET);
+
+ ret = pwrseq_get(np, pwrseq);
+ if (ret) {
+ /* Mark current pwrseq as unused */
+ pwrseq->used = false;
+ return ERR_PTR(ret);
+ }
+
+ ret = pwrseq_on(pwrseq);
+ if (ret)
+ goto pwr_put;
+
+ return pwrseq;
+
+pwr_put:
+ pwrseq_put(pwrseq);
+ return ERR_PTR(ret);
+}
+EXPORT_SYMBOL_GPL(of_pwrseq_on);
+
+void of_pwrseq_off(struct pwrseq *pwrseq)
+{
+ pwrseq_off(pwrseq);
+ pwrseq_put(pwrseq);
+}
+EXPORT_SYMBOL_GPL(of_pwrseq_off);
+
+int of_pwrseq_on_list(struct device_node *np, struct list_head *head)
+{
+ struct pwrseq *pwrseq;
+ struct pwrseq_list_per_dev *pwrseq_list_node;
+
+ pwrseq = of_pwrseq_on(np);
+ if (IS_ERR(pwrseq))
+ return PTR_ERR(pwrseq);
+
+ pwrseq_list_node = kzalloc(sizeof(*pwrseq_list_node), GFP_KERNEL);
+ if (!pwrseq_list_node) {
+ of_pwrseq_off(pwrseq);
+ return -ENOMEM;
+ }
+ pwrseq_list_node->pwrseq = pwrseq;
+ list_add(&pwrseq_list_node->list, head);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(of_pwrseq_on_list);
+
+void of_pwrseq_off_list(struct list_head *head)
+{
+ struct pwrseq *pwrseq;
+ struct pwrseq_list_per_dev *pwrseq_list_node, *tmp_node;
+
+ list_for_each_entry_safe(pwrseq_list_node, tmp_node, head, list) {
+ pwrseq = pwrseq_list_node->pwrseq;
+ of_pwrseq_off(pwrseq);
+ list_del(&pwrseq_list_node->list);
+ kfree(pwrseq_list_node);
+ }
+}
+EXPORT_SYMBOL_GPL(of_pwrseq_off_list);
diff --git a/drivers/power/pwrseq/pwrseq_generic.c b/drivers/power/pwrseq/pwrseq_generic.c
new file mode 100644
index 0000000..d7a77f2
--- /dev/null
+++ b/drivers/power/pwrseq/pwrseq_generic.c
@@ -0,0 +1,183 @@
+/*
+ * pwrseq_generic.c Generic power sequence handling
+ *
+ * Copyright (C) 2016 Freescale Semiconductor, Inc.
+ * Author: Peter Chen <[email protected]>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 of
+ * the License as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/slab.h>
+
+#include <linux/power/pwrseq.h>
+
+struct pwrseq_generic {
+ struct pwrseq pwrseq;
+ struct gpio_desc *gpiod_reset;
+ struct clk *clks[PWRSEQ_MAX_CLKS];
+ u32 duration_us;
+};
+
+#define to_generic_pwrseq(p) container_of(p, struct pwrseq_generic, pwrseq)
+
+static int pwrseq_generic_alloc_instance(void);
+static const struct of_device_id generic_id_table[] = {
+ { .compatible = "generic",},
+ { /* sentinel */ }
+};
+
+static void pwrseq_generic_put(struct pwrseq *pwrseq)
+{
+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq);
+ int clk;
+
+ if (pwrseq_gen->gpiod_reset)
+ gpiod_put(pwrseq_gen->gpiod_reset);
+
+ for (clk = 0; clk < PWRSEQ_MAX_CLKS; clk++)
+ clk_put(pwrseq_gen->clks[clk]);
+
+ pwrseq_unregister(&pwrseq_gen->pwrseq);
+ kfree(pwrseq_gen);
+}
+
+static void pwrseq_generic_off(struct pwrseq *pwrseq)
+{
+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq);
+ int clk;
+
+ for (clk = PWRSEQ_MAX_CLKS - 1; clk >= 0; clk--)
+ clk_disable_unprepare(pwrseq_gen->clks[clk]);
+}
+
+static int pwrseq_generic_on(struct pwrseq *pwrseq)
+{
+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq);
+ int clk, ret = 0;
+ struct gpio_desc *gpiod_reset = pwrseq_gen->gpiod_reset;
+
+ for (clk = 0; clk < PWRSEQ_MAX_CLKS && pwrseq_gen->clks[clk]; clk++) {
+ ret = clk_prepare_enable(pwrseq_gen->clks[clk]);
+ if (ret) {
+ pr_err("Can't enable clock, ret=%d\n", ret);
+ goto err_disable_clks;
+ }
+ }
+
+ if (gpiod_reset) {
+ u32 duration_us = pwrseq_gen->duration_us;
+
+ if (duration_us <= 10)
+ udelay(10);
+ else
+ usleep_range(duration_us, duration_us + 100);
+ gpiod_set_value(gpiod_reset, 0);
+ }
+
+ return ret;
+
+err_disable_clks:
+ while (--clk >= 0)
+ clk_disable_unprepare(pwrseq_gen->clks[clk]);
+
+ return ret;
+}
+
+static int pwrseq_generic_get(struct device_node *np, struct pwrseq *pwrseq)
+{
+ struct pwrseq_generic *pwrseq_gen = to_generic_pwrseq(pwrseq);
+ enum of_gpio_flags flags;
+ int reset_gpio, clk, ret = 0;
+
+ for (clk = 0; clk < PWRSEQ_MAX_CLKS; clk++) {
+ pwrseq_gen->clks[clk] = of_clk_get(np, clk);
+ if (IS_ERR(pwrseq_gen->clks[clk])) {
+ ret = PTR_ERR(pwrseq_gen->clks[clk]);
+ if (ret != -ENOENT)
+ goto err_put_clks;
+ pwrseq_gen->clks[clk] = NULL;
+ break;
+ }
+ }
+
+ reset_gpio = of_get_named_gpio_flags(np, "reset-gpios", 0, &flags);
+ if (gpio_is_valid(reset_gpio)) {
+ unsigned long gpio_flags;
+
+ if (flags & OF_GPIO_ACTIVE_LOW)
+ gpio_flags = GPIOF_ACTIVE_LOW | GPIOF_OUT_INIT_LOW;
+ else
+ gpio_flags = GPIOF_OUT_INIT_HIGH;
+
+ ret = gpio_request_one(reset_gpio, gpio_flags,
+ "pwrseq-reset-gpios");
+ if (ret)
+ goto err_put_clks;
+
+ pwrseq_gen->gpiod_reset = gpio_to_desc(reset_gpio);
+ of_property_read_u32(np, "reset-duration-us",
+ &pwrseq_gen->duration_us);
+ } else if (reset_gpio == -ENOENT) {
+ ; /* no such gpio */
+ } else {
+ ret = reset_gpio;
+ pr_err("Failed to get reset gpio on %s, err = %d\n",
+ np->full_name, reset_gpio);
+ goto err_put_clks;
+ }
+
+ /* allocate new one for later pwrseq instance request */
+ ret = pwrseq_generic_alloc_instance();
+ if (ret)
+ goto err_put_gpio;
+
+ return 0;
+
+err_put_gpio:
+ if (pwrseq_gen->gpiod_reset)
+ gpiod_put(pwrseq_gen->gpiod_reset);
+err_put_clks:
+ while (--clk >= 0)
+ clk_put(pwrseq_gen->clks[clk]);
+ return ret;
+}
+
+static int pwrseq_generic_alloc_instance(void)
+{
+ struct pwrseq_generic *pwrseq_gen;
+
+ pwrseq_gen = kzalloc(sizeof(*pwrseq_gen), GFP_KERNEL);
+ if (!pwrseq_gen)
+ return -ENOMEM;
+
+ pwrseq_gen->pwrseq.pwrseq_of_match_table = generic_id_table;
+ pwrseq_gen->pwrseq.get = pwrseq_generic_get;
+ pwrseq_gen->pwrseq.on = pwrseq_generic_on;
+ pwrseq_gen->pwrseq.off = pwrseq_generic_off;
+ pwrseq_gen->pwrseq.put = pwrseq_generic_put;
+
+ pwrseq_register(&pwrseq_gen->pwrseq);
+ return 0;
+}
+
+static int __init pwrseq_generic_register(void)
+{
+ return pwrseq_generic_alloc_instance();
+}
+postcore_initcall(pwrseq_generic_register)
diff --git a/include/linux/power/pwrseq.h b/include/linux/power/pwrseq.h
new file mode 100644
index 0000000..4f37275
--- /dev/null
+++ b/include/linux/power/pwrseq.h
@@ -0,0 +1,72 @@
+#ifndef __LINUX_PWRSEQ_H
+#define __LINUX_PWRSEQ_H
+
+#include <linux/of.h>
+
+#define PWRSEQ_MAX_CLKS 3
+
+struct pwrseq {
+ const struct of_device_id *pwrseq_of_match_table;
+ struct list_head node;
+ int (*get)(struct device_node *np, struct pwrseq *p);
+ int (*on)(struct pwrseq *p);
+ void (*off)(struct pwrseq *p);
+ void (*put)(struct pwrseq *p);
+ int (*suspend)(struct pwrseq *p);
+ int (*resume)(struct pwrseq *p);
+ bool used;
+};
+
+/* used for power sequence instance list in one driver */
+struct pwrseq_list_per_dev {
+ struct pwrseq *pwrseq;
+ struct list_head list;
+};
+
+#if IS_ENABLED(CONFIG_POWER_SEQUENCE)
+int pwrseq_get(struct device_node *np, struct pwrseq *p);
+int pwrseq_on(struct pwrseq *p);
+void pwrseq_off(struct pwrseq *p);
+void pwrseq_put(struct pwrseq *p);
+int pwrseq_suspend(struct pwrseq *p);
+int pwrseq_resume(struct pwrseq *p);
+void pwrseq_register(struct pwrseq *pwrseq);
+void pwrseq_unregister(struct pwrseq *pwrseq);
+struct pwrseq *of_pwrseq_on(struct device_node *np);
+void of_pwrseq_off(struct pwrseq *pwrseq);
+int of_pwrseq_on_list(struct device_node *np, struct list_head *head);
+void of_pwrseq_off_list(struct list_head *head);
+#else
+static inline int pwrseq_get(struct device_node *np, struct pwrseq *p)
+{
+ return 0;
+}
+static inline int pwrseq_on(struct pwrseq *p)
+{
+ return 0;
+}
+static inline void pwrseq_off(struct pwrseq *p) {}
+static inline void pwrseq_put(struct pwrseq *p) {}
+static inline int pwrseq_suspend(struct pwrseq *p)
+{
+ return 0;
+}
+static inline int pwrseq_resume(struct pwrseq *p)
+{
+ return 0;
+}
+static inline void pwrseq_register(struct pwrseq *pwrseq) {}
+static inline void pwrseq_unregister(struct pwrseq *pwrseq) {}
+static inline struct pwrseq *of_pwrseq_on(struct device_node *np)
+{
+ return NULL;
+}
+void of_pwrseq_off(struct pwrseq *pwrseq) {}
+int of_pwrseq_on_list(struct device_node *np, struct list_head *head)
+{
+ return 0;
+}
+void of_pwrseq_off_list(struct list_head *head) {}
+#endif /* CONFIG_POWER_SEQUENCE */
+
+#endif /* __LINUX_PWRSEQ_H */
--
2.7.4

2016-10-14 03:15:43

by Peter Chen

Subject: [PATCH v8 1/8] binding-doc: power: pwrseq-generic: add binding doc for generic power sequence library

Add binding doc for generic power sequence library.

Signed-off-by: Peter Chen <[email protected]>
Acked-by: Philipp Zabel <[email protected]>
Acked-by: Rob Herring <[email protected]>
---
.../bindings/power/pwrseq/pwrseq-generic.txt | 48 ++++++++++++++++++++++
1 file changed, 48 insertions(+)
create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt

diff --git a/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
new file mode 100644
index 0000000..ebf0d47
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
@@ -0,0 +1,48 @@
+The generic power sequence library
+
+Some hard-wired devices (eg USB/MMC) need to do power sequence before
+the device can be enumerated on the bus, the typical power sequence
+like: enable USB PHY clock, toggle reset pin, etc. But current
+Linux device driver lacks of such code to do it, it may cause some
+hard-wired devices works abnormal or can't be recognized by
+controller at all. The power sequence will be done before this device
+can be found at the bus.
+
+The power sequence properties is under the device node.
+
+Optional properties:
+- clocks: the input clocks for device.
+- reset-gpios: Should specify the GPIO for reset.
+- reset-duration-us: the duration in microsecond for assert reset signal.
+
+Below is the example of USB power sequence properties on USB device
+nodes which have two level USB hubs.
+
+&usbotg1 {
+ vbus-supply = <&reg_usb_otg1_vbus>;
+ pinctrl-names = "default";
+ pinctrl-0 = <&pinctrl_usb_otg1_id>;
+ status = "okay";
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+ genesys: hub@1 {
+ compatible = "usb5e3,608";
+ reg = <1>;
+
+ clocks = <&clks IMX6SX_CLK_CKO>;
+ reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>; /* hub reset pin */
+ reset-duration-us = <10>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+ asix: ethernet@1 {
+ compatible = "usbb95,1708";
+ reg = <1>;
+
+ clocks = <&clks IMX6SX_CLK_IPG>;
+ reset-gpios = <&gpio4 6 GPIO_ACTIVE_LOW>; /* ethernet_rst */
+ reset-duration-us = <15>;
+ };
+ };
+};
--
2.7.4

2016-10-14 03:16:02

by Peter Chen

Subject: [PATCH v8 3/8] binding-doc: usb: usb-device: add optional properties for power sequence

Add optional properties for power sequence.

Signed-off-by: Peter Chen <[email protected]>
Acked-by: Rob Herring <[email protected]>
---
Documentation/devicetree/bindings/usb/usb-device.txt | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/usb/usb-device.txt b/Documentation/devicetree/bindings/usb/usb-device.txt
index 1c35e7b..3661dd2 100644
--- a/Documentation/devicetree/bindings/usb/usb-device.txt
+++ b/Documentation/devicetree/bindings/usb/usb-device.txt
@@ -13,6 +13,10 @@ Required properties:
- reg: the port number which this device is connecting to, the range
is 1-31.

+Optional properties:
+power sequence properties, see
+Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt for detail
+
Example:

&usb1 {
@@ -21,8 +25,12 @@ Example:
#address-cells = <1>;
#size-cells = <0>;

- hub: genesys@1 {
+ genesys: hub@1 {
compatible = "usb5e3,608";
reg = <1>;
+
+ clocks = <&clks IMX6SX_CLK_CKO>;
+ reset-gpios = <&gpio4 5 GPIO_ACTIVE_LOW>; /* hub reset pin */
+ reset-duration-us = <10>;
};
}
--
2.7.4

2016-10-14 03:16:16

by Peter Chen

Subject: [PATCH v8 4/8] usb: core: add power sequence handling for USB devices

Some hard-wired USB devices need to do power sequence to let the
device work normally, the typical power sequence like: enable USB
PHY clock, toggle reset pin, etc. But current Linux USB driver
lacks of such code to do it, it may cause some hard-wired USB devices
works abnormal or can't be recognized by controller at all.

In this patch, it calls power sequence library APIs to finish
the power sequence events. It will do power on sequence at hub's
probe for all devices under this hub (includes root hub).
At hub_disconnect, it will do power off sequence which is at powered
on list.

Signed-off-by: Peter Chen <[email protected]>
Tested-by Joshua Clayton <[email protected]>
---
drivers/usb/core/hub.c | 41 ++++++++++++++++++++++++++++++++++++++---
drivers/usb/core/hub.h | 1 +
2 files changed, 39 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index cbb1467..acbbf0a 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -26,6 +26,7 @@
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/pm_qos.h>
+#include <linux/power/pwrseq.h>

#include <asm/uaccess.h>
#include <asm/byteorder.h>
@@ -1695,6 +1696,7 @@ static void hub_disconnect(struct usb_interface *intf)
hub->error = 0;
hub_quiesce(hub, HUB_DISCONNECT);

+ of_pwrseq_off_list(&hub->pwrseq_on_list);
mutex_lock(&usb_port_peer_mutex);

/* Avoid races with recursively_mark_NOTATTACHED() */
@@ -1722,12 +1724,41 @@ static void hub_disconnect(struct usb_interface *intf)
kref_put(&hub->kref, hub_release);
}

+#ifdef CONFIG_OF
+static int hub_of_pwrseq_on(struct usb_hub *hub)
+{
+ struct device *parent;
+ struct usb_device *hdev = hub->hdev;
+ struct device_node *np;
+ int ret;
+
+ if (hdev->parent)
+ parent = &hdev->dev;
+ else
+ parent = bus_to_hcd(hdev->bus)->self.controller;
+
+ for_each_child_of_node(parent->of_node, np) {
+ ret = of_pwrseq_on_list(np, &hub->pwrseq_on_list);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+#else
+static int hub_of_pwrseq_on(struct usb_hub *hub)
+{
+ return 0;
+}
+#endif
+
static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
struct usb_host_interface *desc;
struct usb_endpoint_descriptor *endpoint;
struct usb_device *hdev;
struct usb_hub *hub;
+ int ret = -ENODEV;

desc = intf->cur_altsetting;
hdev = interface_to_usbdev(intf);
@@ -1832,6 +1863,7 @@ descriptor_error:
INIT_DELAYED_WORK(&hub->leds, led_work);
INIT_DELAYED_WORK(&hub->init_work, NULL);
INIT_WORK(&hub->events, hub_event);
+ INIT_LIST_HEAD(&hub->pwrseq_on_list);
usb_get_intf(intf);
usb_get_dev(hdev);

@@ -1845,11 +1877,14 @@ descriptor_error:
if (id->driver_info & HUB_QUIRK_CHECK_PORT_AUTOSUSPEND)
hub->quirk_check_port_auto_suspend = 1;

- if (hub_configure(hub, endpoint) >= 0)
- return 0;
+ if (hub_configure(hub, endpoint) >= 0) {
+ ret = hub_of_pwrseq_on(hub);
+ if (!ret)
+ return 0;
+ }

hub_disconnect(intf);
- return -ENODEV;
+ return ret;
}

static int
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 34c1a7e..cd86f91 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -78,6 +78,7 @@ struct usb_hub {
struct delayed_work init_work;
struct work_struct events;
struct usb_port **ports;
+ struct list_head pwrseq_on_list; /* powered pwrseq node list */
};

/**
--
2.7.4

2016-10-14 03:16:31

by Peter Chen

Subject: [PATCH v8 6/8] ARM: dts: imx6qdl: Enable usb node children with <reg>

From: Joshua Clayton <[email protected]>

Give usb nodes #address and #size attributes, so that a child node
representing a permanently connected device such as an onboard hub may
be addressed with a <reg> attribute

Signed-off-by: Joshua Clayton <[email protected]>
Signed-off-by: Peter Chen <[email protected]>
---
arch/arm/boot/dts/imx6qdl.dtsi | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/imx6qdl.dtsi b/arch/arm/boot/dts/imx6qdl.dtsi
index b13b0b2..8fc66e1 100644
--- a/arch/arm/boot/dts/imx6qdl.dtsi
+++ b/arch/arm/boot/dts/imx6qdl.dtsi
@@ -935,6 +935,8 @@

usbh1: usb@02184200 {
compatible = "fsl,imx6q-usb", "fsl,imx27-usb";
+ #address-cells = <1>;
+ #size-cells = <0>;
reg = <0x02184200 0x200>;
interrupts = <0 40 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6QDL_CLK_USBOH3>;
@@ -949,6 +951,8 @@

usbh2: usb@02184400 {
compatible = "fsl,imx6q-usb", "fsl,imx27-usb";
+ #address-cells = <1>;
+ #size-cells = <0>;
reg = <0x02184400 0x200>;
interrupts = <0 41 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6QDL_CLK_USBOH3>;
@@ -962,6 +966,8 @@

usbh3: usb@02184600 {
compatible = "fsl,imx6q-usb", "fsl,imx27-usb";
+ #address-cells = <1>;
+ #size-cells = <0>;
reg = <0x02184600 0x200>;
interrupts = <0 42 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX6QDL_CLK_USBOH3>;
--
2.7.4

2016-10-14 03:16:38

by Peter Chen

Subject: [PATCH v8 7/8] ARM: dts: imx6qdl-udoo.dtsi: fix onboard USB HUB property

The current dts describes USB HUB's property at USB controller's
entry, it is improper. The USB HUB should be the child node
under USB controller, and power sequence properties are under
it. Besides, using gpio pinctrl setting for USB2415's reset pin.

Tested-by: Maciej S. Szmigiero <[email protected]>
Signed-off-by: Peter Chen <[email protected]>
Signed-off-by: Joshua Clayton <[email protected]>
---
arch/arm/boot/dts/imx6qdl-udoo.dtsi | 26 ++++++++++++--------------
1 file changed, 12 insertions(+), 14 deletions(-)

diff --git a/arch/arm/boot/dts/imx6qdl-udoo.dtsi b/arch/arm/boot/dts/imx6qdl-udoo.dtsi
index 3bee2f9..87fe31f 100644
--- a/arch/arm/boot/dts/imx6qdl-udoo.dtsi
+++ b/arch/arm/boot/dts/imx6qdl-udoo.dtsi
@@ -9,6 +9,8 @@
*
*/

+#include <dt-bindings/gpio/gpio.h>
+
/ {
aliases {
backlight = &backlight;
@@ -58,17 +60,6 @@
#address-cells = <1>;
#size-cells = <0>;

- reg_usb_h1_vbus: regulator@0 {
- compatible = "regulator-fixed";
- reg = <0>;
- regulator-name = "usb_h1_vbus";
- regulator-min-microvolt = <5000000>;
- regulator-max-microvolt = <5000000>;
- enable-active-high;
- startup-delay-us = <2>; /* USB2415 requires a POR of 1 us minimum */
- gpio = <&gpio7 12 0>;
- };
-
reg_panel: regulator@1 {
compatible = "regulator-fixed";
reg = <1>;
@@ -188,7 +179,7 @@

pinctrl_usbh: usbhgrp {
fsl,pins = <
- MX6QDL_PAD_GPIO_17__GPIO7_IO12 0x80000000
+ MX6QDL_PAD_GPIO_17__GPIO7_IO12 0x1b0b0
MX6QDL_PAD_NANDF_CS2__CCM_CLKO2 0x130b0
>;
};
@@ -259,9 +250,16 @@
&usbh1 {
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usbh>;
- vbus-supply = <&reg_usb_h1_vbus>;
- clocks = <&clks IMX6QDL_CLK_CKO>;
status = "okay";
+
+ usb2415: hub@1 {
+ compatible = "usb424,2514";
+ reg = <1>;
+
+ clocks = <&clks IMX6QDL_CLK_CKO>;
+ reset-gpios = <&gpio7 12 GPIO_ACTIVE_LOW>;
+ reset-duration-us = <3000>;
+ };
};

&usdhc3 {
--
2.7.4

2016-10-14 03:16:50

by Peter Chen

Subject: [PATCH v8 5/8] usb: chipidea: let chipidea core device of_node equal's glue layer device of_node

From: Peter Chen <[email protected]>

At device tree, we have no device node for chipidea core,
the glue layer's node is the parent node for host and udc
device. But in related driver, the parent device is chipidea
core. So, in order to let the common driver get parent's node,
we let the core's device node equals glue layer device node.

Signed-off-by: Peter Chen <[email protected]>
Tested-by: Maciej S. Szmigiero <[email protected]>
Tested-by Joshua Clayton <[email protected]>
---
drivers/usb/chipidea/core.c | 27 ++++++++++++++++++++++-----
1 file changed, 22 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 69426e6..6839e19 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -927,6 +927,16 @@ static int ci_hdrc_probe(struct platform_device *pdev)
return -ENODEV;
}

+ /*
+ * At device tree, we have no device node for chipidea core,
+ * the glue layer's node is the parent node for host and udc
+ * device. But in related driver, the parent device is chipidea
+ * core. So, in order to let the common driver get parent's node,
+ * we let the core's device node equals glue layer's node.
+ */
+ if (dev->parent && dev->parent->of_node)
+ dev->of_node = dev->parent->of_node;
+
if (ci->platdata->phy) {
ci->phy = ci->platdata->phy;
} else if (ci->platdata->usb_phy) {
@@ -937,11 +947,15 @@ static int ci_hdrc_probe(struct platform_device *pdev)

/* if both generic PHY and USB PHY layers aren't enabled */
if (PTR_ERR(ci->phy) == -ENOSYS &&
- PTR_ERR(ci->usb_phy) == -ENXIO)
- return -ENXIO;
+ PTR_ERR(ci->usb_phy) == -ENXIO) {
+ ret = -ENXIO;
+ goto clear_of_node;
+ }

- if (IS_ERR(ci->phy) && IS_ERR(ci->usb_phy))
- return -EPROBE_DEFER;
+ if (IS_ERR(ci->phy) && IS_ERR(ci->usb_phy)) {
+ ret = -EPROBE_DEFER;
+ goto clear_of_node;
+ }

if (IS_ERR(ci->phy))
ci->phy = NULL;
@@ -952,7 +966,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
ret = ci_usb_phy_init(ci);
if (ret) {
dev_err(dev, "unable to init phy: %d\n", ret);
- return ret;
+ goto clear_of_node;
}

ci->hw_bank.phys = res->start;
@@ -1058,6 +1072,8 @@ stop:
ci_role_destroy(ci);
deinit_phy:
ci_usb_phy_exit(ci);
+clear_of_node:
+ dev->of_node = NULL;

return ret;
}
@@ -1076,6 +1092,7 @@ static int ci_hdrc_remove(struct platform_device *pdev)
ci_extcon_unregister(ci);
ci_role_destroy(ci);
ci_hdrc_enter_lpm(ci, true);
+ ci->dev->of_node = NULL;
ci_usb_phy_exit(ci);

return 0;
--
2.7.4

2016-10-14 03:17:21

by Peter Chen

Subject: [PATCH v8 8/8] ARM: dts: imx6q-evi: Fix onboard hub reset line

From: Joshua Clayton <[email protected]>

Previously the onboard hub was made to work by treating its
reset gpio as a regulator enable.
Get rid of that kludge now that pwseq has added reset gpio support
Move pin muxing the hub reset pin into the usbh1 group

Signed-off-by: Joshua Clayton <[email protected]>
Signed-off-by: Peter Chen <[email protected]>
---
arch/arm/boot/dts/imx6q-evi.dts | 25 +++++++------------------
1 file changed, 7 insertions(+), 18 deletions(-)

diff --git a/arch/arm/boot/dts/imx6q-evi.dts b/arch/arm/boot/dts/imx6q-evi.dts
index 4fa5601..49c6f61 100644
--- a/arch/arm/boot/dts/imx6q-evi.dts
+++ b/arch/arm/boot/dts/imx6q-evi.dts
@@ -54,18 +54,6 @@
reg = <0x10000000 0x40000000>;
};

- reg_usbh1_vbus: regulator-usbhubreset {
- compatible = "regulator-fixed";
- regulator-name = "usbh1_vbus";
- regulator-min-microvolt = <5000000>;
- regulator-max-microvolt = <5000000>;
- enable-active-high;
- startup-delay-us = <2>;
- pinctrl-names = "default";
- pinctrl-0 = <&pinctrl_usbh1_hubreset>;
- gpio = <&gpio7 12 GPIO_ACTIVE_HIGH>;
- };
-
reg_usb_otg_vbus: regulator-usbotgvbus {
compatible = "regulator-fixed";
regulator-name = "usb_otg_vbus";
@@ -204,12 +192,18 @@
};

&usbh1 {
- vbus-supply = <&reg_usbh1_vbus>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usbh1>;
dr_mode = "host";
disable-over-current;
status = "okay";
+
+ usb2415host: hub@1 {
+ compatible = "usb424,2513";
+ reg = <1>;
+ reset-gpios = <&gpio7 12 GPIO_ACTIVE_LOW>;
+ reset-duration-us = <3000>;
+ };
};

&usbotg {
@@ -467,11 +461,6 @@
MX6QDL_PAD_GPIO_3__USB_H1_OC 0x1b0b0
/* usbh1_b OC */
MX6QDL_PAD_GPIO_0__GPIO1_IO00 0x1b0b0
- >;
- };
-
- pinctrl_usbh1_hubreset: usbh1hubresetgrp {
- fsl,pins = <
MX6QDL_PAD_GPIO_17__GPIO7_IO12 0x1b0b0
>;
};
--
2.7.4

2016-10-14 12:02:54

by Rafael J. Wysocki

Subject: Re: [PATCH v8 0/8] power: add power sequence library

On Friday, October 14, 2016 10:59:47 AM Peter Chen wrote:
> Hi all,
>
> This is a follow-up for my last power sequence framework patch set [1].
> According to Rob Herring and Ulf Hansson's comments[2]. The kinds of
> power sequence instances will be added at postcore_initcall, the match
> criteria is compatible string first, if the compatible string is not
> matched between dts and library, it will try to use generic power sequence.
>
> The host driver just needs to call of_pwrseq_on/of_pwrseq_off
> if only one power sequence instance is needed, for more power sequences
> are used, using of_pwrseq_on_list/of_pwrseq_off_list instead (eg, USB hub driver).
>
> In future, if there are special power sequence requirements, the special
> power sequence library can be created.
>
> This patch set is tested on i.mx6 sabresx evk using a dts change, I use
> two hot-plug devices to simulate this use case, the related binding
> change is updated at patch [1/6], The udoo board changes were tested
> using my last power sequence patch set.[3]
>
> Except for hard-wired MMC and USB devices, I find the USB ULPI PHY also
> need to power on itself before it can be found by ULPI bus.
>
> [1] http://www.spinics.net/lists/linux-usb/msg142755.html
> [2] http://www.spinics.net/lists/linux-usb/msg143106.html
> [3] http://www.spinics.net/lists/linux-usb/msg142815.html
>
> Changes for v8:
> - Allocate one extra pwrseq instance if pwrseq_get has succeed, it can avoid
> preallocate instances problem which the number of instance is decided at
> compile time, thanks for Heiko Stuebner's suggestion [Patch 2/8]
> - Delete pwrseq_compatible_sample.c which is the demo purpose to show compatible
> match method. [Patch 2/8]
> - Add Maciej S. Szmigiero's tested-by. [Patch 7/8]
>
> Changes for v7:
> - Create kinds of power sequence instance at postcore_initcall, and match
> the instance with node using compatible string, the beneit of this is
> the host driver doesn't need to consider which pwrseq instance needs
> to be used, and pwrseq core will match it, however, it eats some memories
> if less power sequence instances are used. [Patch 2/8]
> - Add pwrseq_compatible_sample.c to test match pwrseq using device_id. [Patch 2/8]
> - Fix the comments Vaibhav Hiremath adds for error path for clock and do not
> use device_node for parameters at pwrseq_on. [Patch 2/8]
> - Simplify the caller to use power sequence, follows Alan's commnets [Patch 4/8]
> - Tested three pwrseq instances together using both specific compatible string and
> generic libraries.
>
> Changes for v6:
> - Add Matthias Kaehlcke's Reviewed-by and Tested-by. (patch [2/6])
> - Change chipidea core of_node assignment for coming user. (patch [5/6])
> - Applies Joshua Clayton's three dts changes for two boards,
> the USB device's reg has only #address-cells, but without #size-cells.
>
> Changes for v5:
> - Delete pwrseq_register/pwrseq_unregister, which is useless currently
> - Fix the linker error when the pwrseq user is compiled as module
>
> Changes for v4:
> - Create the patch on next-20160722
> - Fix the of_node is not NULL after chipidea driver is unbinded [Patch 5/6]
> - Using more friendly wait method for reset gpio [Patch 2/6]
> - Support multiple input clocks [Patch 2/6]
> - Add Rob Herring's ack for DT changes
> - Add Joshua Clayton's Tested-by
>
> Changes for v3:
> - Delete "power-sequence" property at binding-doc, and change related code
> at both library and user code.
> - Change binding-doc example node name with Rob's comments
> - of_get_named_gpio_flags only gets the gpio, but without setting gpio flags,
> add additional code request gpio with proper gpio flags
> - Add Philipp Zabel's Ack and MAINTAINER's entry
>
> Changes for v2:
> - Delete "pwrseq" prefix and clock-names for properties at dt binding
> - Should use structure not but its pointer for kzalloc
> - Since chipidea core has no of_node, let core's of_node equals glue
> layer's at core's probe
>
> Joshua Clayton (2):
> ARM: dts: imx6qdl: Enable usb node children with <reg>
> ARM: dts: imx6q-evi: Fix onboard hub reset line
>
> Peter Chen (6):
> binding-doc: power: pwrseq-generic: add binding doc for generic power
> sequence library
> power: add power sequence library
> binding-doc: usb: usb-device: add optional properties for power
> sequence
> usb: core: add power sequence handling for USB devices
> usb: chipidea: let chipidea core device of_node equal's glue layer
> device of_node
> ARM: dts: imx6qdl-udoo.dtsi: fix onboard USB HUB property
>
> .../bindings/power/pwrseq/pwrseq-generic.txt | 48 ++++++
> .../devicetree/bindings/usb/usb-device.txt | 10 +-
> MAINTAINERS | 9 +
> arch/arm/boot/dts/imx6q-evi.dts | 25 +--
> arch/arm/boot/dts/imx6qdl-udoo.dtsi | 26 ++-
> arch/arm/boot/dts/imx6qdl.dtsi | 6 +
> drivers/power/Kconfig | 1 +
> drivers/power/Makefile | 1 +
> drivers/power/pwrseq/Kconfig | 19 ++
> drivers/power/pwrseq/Makefile | 2 +
> drivers/power/pwrseq/core.c | 191 +++++++++++++++++++++
> drivers/power/pwrseq/pwrseq_generic.c | 183 ++++++++++++++++++++
> drivers/usb/chipidea/core.c | 27 ++-
> drivers/usb/core/hub.c | 41 ++++-
> drivers/usb/core/hub.h | 1 +
> include/linux/power/pwrseq.h | 72 ++++++++
> 16 files changed, 621 insertions(+), 41 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
> create mode 100644 drivers/power/pwrseq/Kconfig
> create mode 100644 drivers/power/pwrseq/Makefile
> create mode 100644 drivers/power/pwrseq/core.c
> create mode 100644 drivers/power/pwrseq/pwrseq_generic.c
> create mode 100644 include/linux/power/pwrseq.h

Meta question: Who's the maintainer you are targetting this at?

Thanks,
Rafael

2016-10-17 01:31:33

by Peter Chen

Subject: Re: [PATCH v8 0/8] power: add power sequence library

On Fri, Oct 14, 2016 at 02:09:31PM +0200, Rafael J. Wysocki wrote:
> On Friday, October 14, 2016 10:59:47 AM Peter Chen wrote:
> > Hi all,
> >
> > This is a follow-up for my last power sequence framework patch set [1].
> > According to Rob Herring and Ulf Hansson's comments[2]. The kinds of
> > power sequence instances will be added at postcore_initcall, the match
> > criteria is compatible string first, if the compatible string is not
> > matched between dts and library, it will try to use generic power sequence.
> >
> > The host driver just needs to call of_pwrseq_on/of_pwrseq_off
> > if only one power sequence instance is needed, for more power sequences
> > are used, using of_pwrseq_on_list/of_pwrseq_off_list instead (eg, USB hub driver).
> >
> > In future, if there are special power sequence requirements, the special
> > power sequence library can be created.
> >
> > This patch set is tested on i.mx6 sabresx evk using a dts change, I use
> > two hot-plug devices to simulate this use case, the related binding
> > change is updated at patch [1/6], The udoo board changes were tested
> > using my last power sequence patch set.[3]
> >
> > Except for hard-wired MMC and USB devices, I find the USB ULPI PHY also
> > need to power on itself before it can be found by ULPI bus.
> >
> > [1] http://www.spinics.net/lists/linux-usb/msg142755.html
> > [2] http://www.spinics.net/lists/linux-usb/msg143106.html
> > [3] http://www.spinics.net/lists/linux-usb/msg142815.html
> >
> > Changes for v8:
> > - Allocate one extra pwrseq instance if pwrseq_get has succeed, it can avoid
> > preallocate instances problem which the number of instance is decided at
> > compile time, thanks for Heiko Stuebner's suggestion [Patch 2/8]
> > - Delete pwrseq_compatible_sample.c which is the demo purpose to show compatible
> > match method. [Patch 2/8]
> > - Add Maciej S. Szmigiero's tested-by. [Patch 7/8]
> >
> > Changes for v7:
> > - Create kinds of power sequence instance at postcore_initcall, and match
> > the instance with node using compatible string, the beneit of this is
> > the host driver doesn't need to consider which pwrseq instance needs
> > to be used, and pwrseq core will match it, however, it eats some memories
> > if less power sequence instances are used. [Patch 2/8]
> > - Add pwrseq_compatible_sample.c to test match pwrseq using device_id. [Patch 2/8]
> > - Fix the comments Vaibhav Hiremath adds for error path for clock and do not
> > use device_node for parameters at pwrseq_on. [Patch 2/8]
> > - Simplify the caller to use power sequence, follows Alan's commnets [Patch 4/8]
> > - Tested three pwrseq instances together using both specific compatible string and
> > generic libraries.
> >
> > Changes for v6:
> > - Add Matthias Kaehlcke's Reviewed-by and Tested-by. (patch [2/6])
> > - Change chipidea core of_node assignment for coming user. (patch [5/6])
> > - Applies Joshua Clayton's three dts changes for two boards,
> > the USB device's reg has only #address-cells, but without #size-cells.
> >
> > Changes for v5:
> > - Delete pwrseq_register/pwrseq_unregister, which is useless currently
> > - Fix the linker error when the pwrseq user is compiled as module
> >
> > Changes for v4:
> > - Create the patch on next-20160722
> > - Fix the of_node is not NULL after chipidea driver is unbinded [Patch 5/6]
> > - Using more friendly wait method for reset gpio [Patch 2/6]
> > - Support multiple input clocks [Patch 2/6]
> > - Add Rob Herring's ack for DT changes
> > - Add Joshua Clayton's Tested-by
> >
> > Changes for v3:
> > - Delete "power-sequence" property at binding-doc, and change related code
> > at both library and user code.
> > - Change binding-doc example node name with Rob's comments
> > - of_get_named_gpio_flags only gets the gpio, but without setting gpio flags,
> > add additional code request gpio with proper gpio flags
> > - Add Philipp Zabel's Ack and MAINTAINER's entry
> >
> > Changes for v2:
> > - Delete "pwrseq" prefix and clock-names for properties at dt binding
> > - Should use structure not but its pointer for kzalloc
> > - Since chipidea core has no of_node, let core's of_node equals glue
> > layer's at core's probe
> >
> > Joshua Clayton (2):
> > ARM: dts: imx6qdl: Enable usb node children with <reg>
> > ARM: dts: imx6q-evi: Fix onboard hub reset line
> >
> > Peter Chen (6):
> > binding-doc: power: pwrseq-generic: add binding doc for generic power
> > sequence library
> > power: add power sequence library
> > binding-doc: usb: usb-device: add optional properties for power
> > sequence
> > usb: core: add power sequence handling for USB devices
> > usb: chipidea: let chipidea core device of_node equal's glue layer
> > device of_node
> > ARM: dts: imx6qdl-udoo.dtsi: fix onboard USB HUB property
> >
> > .../bindings/power/pwrseq/pwrseq-generic.txt | 48 ++++++
> > .../devicetree/bindings/usb/usb-device.txt | 10 +-
> > MAINTAINERS | 9 +
> > arch/arm/boot/dts/imx6q-evi.dts | 25 +--
> > arch/arm/boot/dts/imx6qdl-udoo.dtsi | 26 ++-
> > arch/arm/boot/dts/imx6qdl.dtsi | 6 +
> > drivers/power/Kconfig | 1 +
> > drivers/power/Makefile | 1 +
> > drivers/power/pwrseq/Kconfig | 19 ++
> > drivers/power/pwrseq/Makefile | 2 +
> > drivers/power/pwrseq/core.c | 191 +++++++++++++++++++++
> > drivers/power/pwrseq/pwrseq_generic.c | 183 ++++++++++++++++++++
> > drivers/usb/chipidea/core.c | 27 ++-
> > drivers/usb/core/hub.c | 41 ++++-
> > drivers/usb/core/hub.h | 1 +
> > include/linux/power/pwrseq.h | 72 ++++++++
> > 16 files changed, 621 insertions(+), 41 deletions(-)
> > create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
> > create mode 100644 drivers/power/pwrseq/Kconfig
> > create mode 100644 drivers/power/pwrseq/Makefile
> > create mode 100644 drivers/power/pwrseq/core.c
> > create mode 100644 drivers/power/pwrseq/pwrseq_generic.c
> > create mode 100644 include/linux/power/pwrseq.h
>
> Meta question: Who's the maintainer you are targetting this at?
>

Sebastian Reichel mentioned it is better through your tree.
I could be the maintainer for it, and send "GIT PULL" for you
through my git
(https://git.kernel.org/cgit/linux/kernel/git/peter.chen/usb.git/)
Is it ok for you?

--

Best Regards,
Peter Chen

2016-10-18 00:28:54

by Rafael J. Wysocki

Subject: Re: [PATCH v8 0/8] power: add power sequence library

On Monday, October 17, 2016 09:30:59 AM Peter Chen wrote:
> On Fri, Oct 14, 2016 at 02:09:31PM +0200, Rafael J. Wysocki wrote:
> > On Friday, October 14, 2016 10:59:47 AM Peter Chen wrote:
> > > Hi all,
> > >
> > > This is a follow-up for my last power sequence framework patch set [1].
> > > According to Rob Herring and Ulf Hansson's comments[2]. The kinds of
> > > power sequence instances will be added at postcore_initcall, the match
> > > criteria is compatible string first, if the compatible string is not
> > > matched between dts and library, it will try to use generic power sequence.
> > >
> > > The host driver just needs to call of_pwrseq_on/of_pwrseq_off
> > > if only one power sequence instance is needed, for more power sequences
> > > are used, using of_pwrseq_on_list/of_pwrseq_off_list instead (eg, USB hub driver).
> > >
> > > In future, if there are special power sequence requirements, the special
> > > power sequence library can be created.
> > >
> > > This patch set is tested on i.mx6 sabresx evk using a dts change, I use
> > > two hot-plug devices to simulate this use case, the related binding
> > > change is updated at patch [1/6], The udoo board changes were tested
> > > using my last power sequence patch set.[3]
> > >
> > > Except for hard-wired MMC and USB devices, I find the USB ULPI PHY also
> > > need to power on itself before it can be found by ULPI bus.
> > >
> > > [1] http://www.spinics.net/lists/linux-usb/msg142755.html
> > > [2] http://www.spinics.net/lists/linux-usb/msg143106.html
> > > [3] http://www.spinics.net/lists/linux-usb/msg142815.html
> > >
> > > Changes for v8:
> > > - Allocate one extra pwrseq instance if pwrseq_get has succeed, it can avoid
> > > preallocate instances problem which the number of instance is decided at
> > > compile time, thanks for Heiko Stuebner's suggestion [Patch 2/8]
> > > - Delete pwrseq_compatible_sample.c which is the demo purpose to show compatible
> > > match method. [Patch 2/8]
> > > - Add Maciej S. Szmigiero's tested-by. [Patch 7/8]
> > >
> > > Changes for v7:
> > > - Create kinds of power sequence instance at postcore_initcall, and match
> > > the instance with node using compatible string, the beneit of this is
> > > the host driver doesn't need to consider which pwrseq instance needs
> > > to be used, and pwrseq core will match it, however, it eats some memories
> > > if less power sequence instances are used. [Patch 2/8]
> > > - Add pwrseq_compatible_sample.c to test match pwrseq using device_id. [Patch 2/8]
> > > - Fix the comments Vaibhav Hiremath adds for error path for clock and do not
> > > use device_node for parameters at pwrseq_on. [Patch 2/8]
> > > - Simplify the caller to use power sequence, follows Alan's commnets [Patch 4/8]
> > > - Tested three pwrseq instances together using both specific compatible string and
> > > generic libraries.
> > >
> > > Changes for v6:
> > > - Add Matthias Kaehlcke's Reviewed-by and Tested-by. (patch [2/6])
> > > - Change chipidea core of_node assignment for coming user. (patch [5/6])
> > > - Applies Joshua Clayton's three dts changes for two boards,
> > > the USB device's reg has only #address-cells, but without #size-cells.
> > >
> > > Changes for v5:
> > > - Delete pwrseq_register/pwrseq_unregister, which is useless currently
> > > - Fix the linker error when the pwrseq user is compiled as module
> > >
> > > Changes for v4:
> > > - Create the patch on next-20160722
> > > - Fix the of_node is not NULL after chipidea driver is unbinded [Patch 5/6]
> > > - Using more friendly wait method for reset gpio [Patch 2/6]
> > > - Support multiple input clocks [Patch 2/6]
> > > - Add Rob Herring's ack for DT changes
> > > - Add Joshua Clayton's Tested-by
> > >
> > > Changes for v3:
> > > - Delete "power-sequence" property at binding-doc, and change related code
> > > at both library and user code.
> > > - Change binding-doc example node name with Rob's comments
> > > - of_get_named_gpio_flags only gets the gpio, but without setting gpio flags,
> > > add additional code request gpio with proper gpio flags
> > > - Add Philipp Zabel's Ack and MAINTAINER's entry
> > >
> > > Changes for v2:
> > > - Delete "pwrseq" prefix and clock-names for properties at dt binding
> > > - Should use structure not but its pointer for kzalloc
> > > - Since chipidea core has no of_node, let core's of_node equals glue
> > > layer's at core's probe
> > >
> > > Joshua Clayton (2):
> > > ARM: dts: imx6qdl: Enable usb node children with <reg>
> > > ARM: dts: imx6q-evi: Fix onboard hub reset line
> > >
> > > Peter Chen (6):
> > > binding-doc: power: pwrseq-generic: add binding doc for generic power
> > > sequence library
> > > power: add power sequence library
> > > binding-doc: usb: usb-device: add optional properties for power
> > > sequence
> > > usb: core: add power sequence handling for USB devices
> > > usb: chipidea: let chipidea core device of_node equal's glue layer
> > > device of_node
> > > ARM: dts: imx6qdl-udoo.dtsi: fix onboard USB HUB property
> > >
> > > .../bindings/power/pwrseq/pwrseq-generic.txt | 48 ++++++
> > > .../devicetree/bindings/usb/usb-device.txt | 10 +-
> > > MAINTAINERS | 9 +
> > > arch/arm/boot/dts/imx6q-evi.dts | 25 +--
> > > arch/arm/boot/dts/imx6qdl-udoo.dtsi | 26 ++-
> > > arch/arm/boot/dts/imx6qdl.dtsi | 6 +
> > > drivers/power/Kconfig | 1 +
> > > drivers/power/Makefile | 1 +
> > > drivers/power/pwrseq/Kconfig | 19 ++
> > > drivers/power/pwrseq/Makefile | 2 +
> > > drivers/power/pwrseq/core.c | 191 +++++++++++++++++++++
> > > drivers/power/pwrseq/pwrseq_generic.c | 183 ++++++++++++++++++++
> > > drivers/usb/chipidea/core.c | 27 ++-
> > > drivers/usb/core/hub.c | 41 ++++-
> > > drivers/usb/core/hub.h | 1 +
> > > include/linux/power/pwrseq.h | 72 ++++++++
> > > 16 files changed, 621 insertions(+), 41 deletions(-)
> > > create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
> > > create mode 100644 drivers/power/pwrseq/Kconfig
> > > create mode 100644 drivers/power/pwrseq/Makefile
> > > create mode 100644 drivers/power/pwrseq/core.c
> > > create mode 100644 drivers/power/pwrseq/pwrseq_generic.c
> > > create mode 100644 include/linux/power/pwrseq.h
> >
> > Meta question: Who's the maintainer you are targetting this at?
> >
>
> Sebastian Reichel mentioned it is better through your tree.
> I could be the maintainer for it, and send "GIT PULL" for you
> through my git
> (https://git.kernel.org/cgit/linux/kernel/git/peter.chen/usb.git/)
> Is it ok for you?

Let me review the series first. :-)

Thanks,
Rafael

2016-10-18 01:16:52

by Peter Chen

Subject: Re: [PATCH v8 0/8] power: add power sequence library

On Tue, Oct 18, 2016 at 02:35:38AM +0200, Rafael J. Wysocki wrote:
> On Monday, October 17, 2016 09:30:59 AM Peter Chen wrote:
> > On Fri, Oct 14, 2016 at 02:09:31PM +0200, Rafael J. Wysocki wrote:
> > > On Friday, October 14, 2016 10:59:47 AM Peter Chen wrote:
> > > > Hi all,
> > > >
> > > > This is a follow-up for my last power sequence framework patch set [1].
> > > > According to Rob Herring and Ulf Hansson's comments[2]. The kinds of
> > > > power sequence instances will be added at postcore_initcall, the match
> > > > criteria is compatible string first, if the compatible string is not
> > > > matched between dts and library, it will try to use generic power sequence.
> > > >
> > > > The host driver just needs to call of_pwrseq_on/of_pwrseq_off
> > > > if only one power sequence instance is needed, for more power sequences
> > > > are used, using of_pwrseq_on_list/of_pwrseq_off_list instead (eg, USB hub driver).
> > > >
> > > > In future, if there are special power sequence requirements, the special
> > > > power sequence library can be created.
> > > >
> > > > This patch set is tested on i.mx6 sabresx evk using a dts change, I use
> > > > two hot-plug devices to simulate this use case, the related binding
> > > > change is updated at patch [1/6], The udoo board changes were tested
> > > > using my last power sequence patch set.[3]
> > > >
> > > > Except for hard-wired MMC and USB devices, I find the USB ULPI PHY also
> > > > need to power on itself before it can be found by ULPI bus.
> > > >
> > > > [1] http://www.spinics.net/lists/linux-usb/msg142755.html
> > > > [2] http://www.spinics.net/lists/linux-usb/msg143106.html
> > > > [3] http://www.spinics.net/lists/linux-usb/msg142815.html
> > > >
> > > > Changes for v8:
> > > > - Allocate one extra pwrseq instance if pwrseq_get has succeed, it can avoid
> > > > preallocate instances problem which the number of instance is decided at
> > > > compile time, thanks for Heiko Stuebner's suggestion [Patch 2/8]
> > > > - Delete pwrseq_compatible_sample.c which is the demo purpose to show compatible
> > > > match method. [Patch 2/8]
> > > > - Add Maciej S. Szmigiero's tested-by. [Patch 7/8]
> > > >
> > > > Changes for v7:
> > > > - Create kinds of power sequence instance at postcore_initcall, and match
> > > > the instance with node using compatible string, the beneit of this is
> > > > the host driver doesn't need to consider which pwrseq instance needs
> > > > to be used, and pwrseq core will match it, however, it eats some memories
> > > > if less power sequence instances are used. [Patch 2/8]
> > > > - Add pwrseq_compatible_sample.c to test match pwrseq using device_id. [Patch 2/8]
> > > > - Fix the comments Vaibhav Hiremath adds for error path for clock and do not
> > > > use device_node for parameters at pwrseq_on. [Patch 2/8]
> > > > - Simplify the caller to use power sequence, follows Alan's commnets [Patch 4/8]
> > > > - Tested three pwrseq instances together using both specific compatible string and
> > > > generic libraries.
> > > >
> > > > Changes for v6:
> > > > - Add Matthias Kaehlcke's Reviewed-by and Tested-by. (patch [2/6])
> > > > - Change chipidea core of_node assignment for coming user. (patch [5/6])
> > > > - Applies Joshua Clayton's three dts changes for two boards,
> > > > the USB device's reg has only #address-cells, but without #size-cells.
> > > >
> > > > Changes for v5:
> > > > - Delete pwrseq_register/pwrseq_unregister, which is useless currently
> > > > - Fix the linker error when the pwrseq user is compiled as module
> > > >
> > > > Changes for v4:
> > > > - Create the patch on next-20160722
> > > > - Fix the of_node is not NULL after chipidea driver is unbinded [Patch 5/6]
> > > > - Using more friendly wait method for reset gpio [Patch 2/6]
> > > > - Support multiple input clocks [Patch 2/6]
> > > > - Add Rob Herring's ack for DT changes
> > > > - Add Joshua Clayton's Tested-by
> > > >
> > > > Changes for v3:
> > > > - Delete "power-sequence" property at binding-doc, and change related code
> > > > at both library and user code.
> > > > - Change binding-doc example node name with Rob's comments
> > > > - of_get_named_gpio_flags only gets the gpio, but without setting gpio flags,
> > > > add additional code request gpio with proper gpio flags
> > > > - Add Philipp Zabel's Ack and MAINTAINER's entry
> > > >
> > > > Changes for v2:
> > > > - Delete "pwrseq" prefix and clock-names for properties at dt binding
> > > > - Should use structure not but its pointer for kzalloc
> > > > - Since chipidea core has no of_node, let core's of_node equals glue
> > > > layer's at core's probe
> > > >
> > > > Joshua Clayton (2):
> > > > ARM: dts: imx6qdl: Enable usb node children with <reg>
> > > > ARM: dts: imx6q-evi: Fix onboard hub reset line
> > > >
> > > > Peter Chen (6):
> > > > binding-doc: power: pwrseq-generic: add binding doc for generic power
> > > > sequence library
> > > > power: add power sequence library
> > > > binding-doc: usb: usb-device: add optional properties for power
> > > > sequence
> > > > usb: core: add power sequence handling for USB devices
> > > > usb: chipidea: let chipidea core device of_node equal's glue layer
> > > > device of_node
> > > > ARM: dts: imx6qdl-udoo.dtsi: fix onboard USB HUB property
> > > >
> > > > .../bindings/power/pwrseq/pwrseq-generic.txt | 48 ++++++
> > > > .../devicetree/bindings/usb/usb-device.txt | 10 +-
> > > > MAINTAINERS | 9 +
> > > > arch/arm/boot/dts/imx6q-evi.dts | 25 +--
> > > > arch/arm/boot/dts/imx6qdl-udoo.dtsi | 26 ++-
> > > > arch/arm/boot/dts/imx6qdl.dtsi | 6 +
> > > > drivers/power/Kconfig | 1 +
> > > > drivers/power/Makefile | 1 +
> > > > drivers/power/pwrseq/Kconfig | 19 ++
> > > > drivers/power/pwrseq/Makefile | 2 +
> > > > drivers/power/pwrseq/core.c | 191 +++++++++++++++++++++
> > > > drivers/power/pwrseq/pwrseq_generic.c | 183 ++++++++++++++++++++
> > > > drivers/usb/chipidea/core.c | 27 ++-
> > > > drivers/usb/core/hub.c | 41 ++++-
> > > > drivers/usb/core/hub.h | 1 +
> > > > include/linux/power/pwrseq.h | 72 ++++++++
> > > > 16 files changed, 621 insertions(+), 41 deletions(-)
> > > > create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
> > > > create mode 100644 drivers/power/pwrseq/Kconfig
> > > > create mode 100644 drivers/power/pwrseq/Makefile
> > > > create mode 100644 drivers/power/pwrseq/core.c
> > > > create mode 100644 drivers/power/pwrseq/pwrseq_generic.c
> > > > create mode 100644 include/linux/power/pwrseq.h
> > >
> > > Meta question: Who's the maintainer you are targetting this at?
> > >
> >
> > Sebastian Reichel mentioned it is better through your tree.
> > I could be the maintainer for it, and send "GIT PULL" for you
> > through my git
> > (https://git.kernel.org/cgit/linux/kernel/git/peter.chen/usb.git/)
> > Is it ok for you?
>
> Let me review the series first. :-)
>

Thanks, Rafael.

--

Best Regards,
Peter Chen

2016-10-26 01:28:18

by Peter Chen

Subject: Re: [PATCH v8 0/8] power: add power sequence library

On Tue, Oct 18, 2016 at 02:35:38AM +0200, Rafael J. Wysocki wrote:
> On Monday, October 17, 2016 09:30:59 AM Peter Chen wrote:
> > On Fri, Oct 14, 2016 at 02:09:31PM +0200, Rafael J. Wysocki wrote:
> > > On Friday, October 14, 2016 10:59:47 AM Peter Chen wrote:
> > > > Hi all,
> > > >
> > > > This is a follow-up for my last power sequence framework patch set [1].
> > > > According to Rob Herring and Ulf Hansson's comments[2]. The kinds of
> > > > power sequence instances will be added at postcore_initcall, the match
> > > > criteria is compatible string first, if the compatible string is not
> > > > matched between dts and library, it will try to use generic power sequence.
> > > >
> > > > The host driver just needs to call of_pwrseq_on/of_pwrseq_off
> > > > if only one power sequence instance is needed, for more power sequences
> > > > are used, using of_pwrseq_on_list/of_pwrseq_off_list instead (eg, USB hub driver).
> > > >
> > > > In future, if there are special power sequence requirements, the special
> > > > power sequence library can be created.
> > > >
> > > > This patch set is tested on i.mx6 sabresx evk using a dts change, I use
> > > > two hot-plug devices to simulate this use case, the related binding
> > > > change is updated at patch [1/6], The udoo board changes were tested
> > > > using my last power sequence patch set.[3]
> > > >
> > > > Except for hard-wired MMC and USB devices, I find the USB ULPI PHY also
> > > > need to power on itself before it can be found by ULPI bus.
> > > >
> > > > [1] http://www.spinics.net/lists/linux-usb/msg142755.html
> > > > [2] http://www.spinics.net/lists/linux-usb/msg143106.html
> > > > [3] http://www.spinics.net/lists/linux-usb/msg142815.html
> > > >
> > > > Changes for v8:
> > > > - Allocate one extra pwrseq instance if pwrseq_get has succeed, it can avoid
> > > > preallocate instances problem which the number of instance is decided at
> > > > compile time, thanks for Heiko Stuebner's suggestion [Patch 2/8]
> > > > - Delete pwrseq_compatible_sample.c which is the demo purpose to show compatible
> > > > match method. [Patch 2/8]
> > > > - Add Maciej S. Szmigiero's tested-by. [Patch 7/8]
> > > >
> > > > Changes for v7:
> > > > - Create kinds of power sequence instance at postcore_initcall, and match
> > > > the instance with node using compatible string, the beneit of this is
> > > > the host driver doesn't need to consider which pwrseq instance needs
> > > > to be used, and pwrseq core will match it, however, it eats some memories
> > > > if less power sequence instances are used. [Patch 2/8]
> > > > - Add pwrseq_compatible_sample.c to test match pwrseq using device_id. [Patch 2/8]
> > > > - Fix the comments Vaibhav Hiremath adds for error path for clock and do not
> > > > use device_node for parameters at pwrseq_on. [Patch 2/8]
> > > > - Simplify the caller to use power sequence, follows Alan's commnets [Patch 4/8]
> > > > - Tested three pwrseq instances together using both specific compatible string and
> > > > generic libraries.
> > > >
> > > > Changes for v6:
> > > > - Add Matthias Kaehlcke's Reviewed-by and Tested-by. (patch [2/6])
> > > > - Change chipidea core of_node assignment for coming user. (patch [5/6])
> > > > - Applies Joshua Clayton's three dts changes for two boards,
> > > > the USB device's reg has only #address-cells, but without #size-cells.
> > > >
> > > > Changes for v5:
> > > > - Delete pwrseq_register/pwrseq_unregister, which is useless currently
> > > > - Fix the linker error when the pwrseq user is compiled as module
> > > >
> > > > Changes for v4:
> > > > - Create the patch on next-20160722
> > > > - Fix the of_node is not NULL after chipidea driver is unbinded [Patch 5/6]
> > > > - Using more friendly wait method for reset gpio [Patch 2/6]
> > > > - Support multiple input clocks [Patch 2/6]
> > > > - Add Rob Herring's ack for DT changes
> > > > - Add Joshua Clayton's Tested-by
> > > >
> > > > Changes for v3:
> > > > - Delete "power-sequence" property at binding-doc, and change related code
> > > > at both library and user code.
> > > > - Change binding-doc example node name with Rob's comments
> > > > - of_get_named_gpio_flags only gets the gpio, but without setting gpio flags,
> > > > add additional code request gpio with proper gpio flags
> > > > - Add Philipp Zabel's Ack and MAINTAINER's entry
> > > >
> > > > Changes for v2:
> > > > - Delete "pwrseq" prefix and clock-names for properties at dt binding
> > > > - Should use structure not but its pointer for kzalloc
> > > > - Since chipidea core has no of_node, let core's of_node equals glue
> > > > layer's at core's probe
> > > >
> > > > Joshua Clayton (2):
> > > > ARM: dts: imx6qdl: Enable usb node children with <reg>
> > > > ARM: dts: imx6q-evi: Fix onboard hub reset line
> > > >
> > > > Peter Chen (6):
> > > > binding-doc: power: pwrseq-generic: add binding doc for generic power
> > > > sequence library
> > > > power: add power sequence library
> > > > binding-doc: usb: usb-device: add optional properties for power
> > > > sequence
> > > > usb: core: add power sequence handling for USB devices
> > > > usb: chipidea: let chipidea core device of_node equal's glue layer
> > > > device of_node
> > > > ARM: dts: imx6qdl-udoo.dtsi: fix onboard USB HUB property
> > > >
> > > > .../bindings/power/pwrseq/pwrseq-generic.txt | 48 ++++++
> > > > .../devicetree/bindings/usb/usb-device.txt | 10 +-
> > > > MAINTAINERS | 9 +
> > > > arch/arm/boot/dts/imx6q-evi.dts | 25 +--
> > > > arch/arm/boot/dts/imx6qdl-udoo.dtsi | 26 ++-
> > > > arch/arm/boot/dts/imx6qdl.dtsi | 6 +
> > > > drivers/power/Kconfig | 1 +
> > > > drivers/power/Makefile | 1 +
> > > > drivers/power/pwrseq/Kconfig | 19 ++
> > > > drivers/power/pwrseq/Makefile | 2 +
> > > > drivers/power/pwrseq/core.c | 191 +++++++++++++++++++++
> > > > drivers/power/pwrseq/pwrseq_generic.c | 183 ++++++++++++++++++++
> > > > drivers/usb/chipidea/core.c | 27 ++-
> > > > drivers/usb/core/hub.c | 41 ++++-
> > > > drivers/usb/core/hub.h | 1 +
> > > > include/linux/power/pwrseq.h | 72 ++++++++
> > > > 16 files changed, 621 insertions(+), 41 deletions(-)
> > > > create mode 100644 Documentation/devicetree/bindings/power/pwrseq/pwrseq-generic.txt
> > > > create mode 100644 drivers/power/pwrseq/Kconfig
> > > > create mode 100644 drivers/power/pwrseq/Makefile
> > > > create mode 100644 drivers/power/pwrseq/core.c
> > > > create mode 100644 drivers/power/pwrseq/pwrseq_generic.c
> > > > create mode 100644 include/linux/power/pwrseq.h
> > >
> > > Meta question: Who's the maintainer you are targetting this at?
> > >
> >
> > Sebastian Reichel mentioned it is better through your tree.
> > I could be the maintainer for it, and send "GIT PULL" for you
> > through my git
> > (https://git.kernel.org/cgit/linux/kernel/git/peter.chen/usb.git/)
> > Is it ok for you?
>
> Let me review the series first. :-)
>

A nice ping..., thanks.

Just see someone is also waiting this series.
http://www.spinics.net/lists/devicetree/msg147655.html

--

Best Regards,
Peter Chen