This series adds:
- the onboard_usb_hub_driver
- glue in the xhci-plat driver to create the onboard_usb_hub
platform device if needed
- a device tree binding for the Realtek RTS5411 USB hub controller
- device tree changes that add RTS5411 entries for the QCA SC7180
based boards trogdor and lazor
- a couple of stubs for platform device functions to avoid
unresolved symbols with certain kernel configs
The main issue the driver addresses is that a USB hub needs to be
powered before it can be discovered. For discrete onboard hubs (an
example for such a hub is the Realtek RTS5411) this is often solved
by supplying the hub with an 'always-on' regulator, which is kind
of a hack. Some onboard hubs may require further initialization
steps, like changing the state of a GPIO or enabling a clock, which
requires even more hacks. This driver creates a platform device
representing the hub which performs the necessary initialization.
Currently it only supports switching on a single regulator, support
for multiple regulators or other actions can be added as needed.
Different initialization sequences can be supported based on the
compatible string.
Besides performing the initialization the driver can be configured
to power the hub off during system suspend. This can help to extend
battery life on battery powered devices which have no requirements
to keep the hub powered during suspend. The driver can also be
configured to leave the hub powered when a wakeup capable USB device
is connected when suspending, and power it off otherwise.
(no changes since v7)
Changes in v7:
- updated DT binding
- series rebased on qcom/arm64-for-5.13
Changes in v6:
- updated summary
Changes in v5:
- cover letter added
Matthias Kaehlcke (5):
dt-bindings: usb: Add binding for Realtek RTS5411 hub controller
USB: misc: Add onboard_usb_hub driver
of/platform: Add stubs for of_platform_device_create/destroy()
usb: host: xhci-plat: Create platform device for onboard hubs in
probe()
arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub
.../sysfs-bus-platform-onboard-usb-hub | 8 +
.../bindings/usb/realtek,rts5411.yaml | 62 +++
MAINTAINERS | 7 +
.../boot/dts/qcom/sc7180-trogdor-lazor-r0.dts | 19 +-
.../boot/dts/qcom/sc7180-trogdor-lazor-r1.dts | 11 +-
.../arm64/boot/dts/qcom/sc7180-trogdor-r1.dts | 19 +-
arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 21 +-
drivers/usb/host/xhci-plat.c | 16 +
drivers/usb/misc/Kconfig | 17 +
drivers/usb/misc/Makefile | 1 +
drivers/usb/misc/onboard_usb_hub.c | 415 ++++++++++++++++++
include/linux/of_platform.h | 22 +-
include/linux/usb/hcd.h | 2 +
include/linux/usb/onboard_hub.h | 15 +
14 files changed, 599 insertions(+), 36 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-bus-platform-onboard-usb-hub
create mode 100644 Documentation/devicetree/bindings/usb/realtek,rts5411.yaml
create mode 100644 drivers/usb/misc/onboard_usb_hub.c
create mode 100644 include/linux/usb/onboard_hub.h
--
2.31.1.498.g6c1eba8ee3d-goog
Check during probe() if a hub supported by the onboard_usb_hub
driver is connected to the controller. If such a hub is found
create the corresponding platform device. This requires the
device tree to have a node for the hub with its vendor and
product id (which is not common for USB devices). Further the
platform device is only created when CONFIG_USB_ONBOARD_HUB=y/m.
Signed-off-by: Matthias Kaehlcke <[email protected]>
---
Changes in v8:
- none
Changes in v7:
- none
Changes in v6:
- none
Changes in v5:
- patch added to the series
drivers/usb/host/xhci-plat.c | 16 ++++++++++++++++
include/linux/usb/hcd.h | 2 ++
2 files changed, 18 insertions(+)
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index c1edcc9b13ce..9c0fb7e8df1f 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -15,6 +15,7 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
+#include <linux/usb/onboard_hub.h>
#include <linux/usb/phy.h>
#include <linux/slab.h>
#include <linux/acpi.h>
@@ -195,6 +196,7 @@ static int xhci_plat_probe(struct platform_device *pdev)
int ret;
int irq;
struct xhci_plat_priv *priv = NULL;
+ struct device_node *np;
if (usb_disabled())
@@ -374,6 +376,17 @@ static int xhci_plat_probe(struct platform_device *pdev)
*/
pm_runtime_forbid(&pdev->dev);
+ np = usb_of_get_device_node(hcd->self.root_hub, hcd->self.busnum);
+ if (np && of_is_onboard_usb_hub(np)) {
+ struct platform_device *pdev;
+
+ pdev = of_platform_device_create(np, NULL, NULL);
+ if (pdev)
+ hcd->onboard_hub_dev = &pdev->dev;
+ else
+ xhci_warn(xhci, "failed to create onboard hub platform device\n");
+ }
+
return 0;
@@ -420,6 +433,9 @@ static int xhci_plat_remove(struct platform_device *dev)
usb_remove_hcd(hcd);
usb_put_hcd(shared_hcd);
+ if (hcd->onboard_hub_dev)
+ of_platform_device_destroy(hcd->onboard_hub_dev, NULL);
+
clk_disable_unprepare(clk);
clk_disable_unprepare(reg_clk);
usb_put_hcd(hcd);
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h
index 96281cd50ff6..d02a508e19b0 100644
--- a/include/linux/usb/hcd.h
+++ b/include/linux/usb/hcd.h
@@ -225,6 +225,8 @@ struct usb_hcd {
* (ohci 32, uhci 1024, ehci 256/512/1024).
*/
+ struct device *onboard_hub_dev;
+
/* The HC driver's private data is stored at the end of
* this structure.
*/
--
2.31.1.498.g6c1eba8ee3d-goog
Code for platform_device_create() and of_platform_device_destroy() is
only generated if CONFIG_OF_ADDRESS=y. Add stubs to avoid unresolved
symbols when CONFIG_OF_ADDRESS is not set.
Signed-off-by: Matthias Kaehlcke <[email protected]>
---
Changes in v8:
- fixed C&P error in commit message
Changes in v7:
- none
Changes in v6:
- patch added to the series
include/linux/of_platform.h | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)
diff --git a/include/linux/of_platform.h b/include/linux/of_platform.h
index 84a966623e78..d15b6cd5e1c3 100644
--- a/include/linux/of_platform.h
+++ b/include/linux/of_platform.h
@@ -61,16 +61,18 @@ static inline struct platform_device *of_find_device_by_node(struct device_node
}
#endif
+extern int of_platform_bus_probe(struct device_node *root,
+ const struct of_device_id *matches,
+ struct device *parent);
+
+#ifdef CONFIG_OF_ADDRESS
/* Platform devices and busses creation */
extern struct platform_device *of_platform_device_create(struct device_node *np,
const char *bus_id,
struct device *parent);
extern int of_platform_device_destroy(struct device *dev, void *data);
-extern int of_platform_bus_probe(struct device_node *root,
- const struct of_device_id *matches,
- struct device *parent);
-#ifdef CONFIG_OF_ADDRESS
+
extern int of_platform_populate(struct device_node *root,
const struct of_device_id *matches,
const struct of_dev_auxdata *lookup,
@@ -84,6 +86,18 @@ extern int devm_of_platform_populate(struct device *dev);
extern void devm_of_platform_depopulate(struct device *dev);
#else
+/* Platform devices and busses creation */
+static inline struct platform_device *of_platform_device_create(struct device_node *np,
+ const char *bus_id,
+ struct device *parent)
+{
+ return NULL;
+}
+static inline int of_platform_device_destroy(struct device *dev, void *data)
+{
+ return -ENODEV;
+}
+
static inline int of_platform_populate(struct device_node *root,
const struct of_device_id *matches,
const struct of_dev_auxdata *lookup,
--
2.31.1.498.g6c1eba8ee3d-goog
The main issue this driver addresses is that a USB hub needs to be
powered before it can be discovered. For discrete onboard hubs (an
example for such a hub is the Realtek RTS5411) this is often solved
by supplying the hub with an 'always-on' regulator, which is kind
of a hack. Some onboard hubs may require further initialization
steps, like changing the state of a GPIO or enabling a clock, which
requires even more hacks. This driver creates a platform device
representing the hub which performs the necessary initialization.
Currently it only supports switching on a single regulator, support
for multiple regulators or other actions can be added as needed.
Different initialization sequences can be supported based on the
compatible string.
Besides performing the initialization the driver can be configured
to power the hub off during system suspend. This can help to extend
battery life on battery powered devices which have no requirements
to keep the hub powered during suspend. The driver can also be
configured to leave the hub powered when a wakeup capable USB device
is connected when suspending, and power it off otherwise.
Technically the driver consists of two drivers, the platform driver
described above and a very thin USB driver that subclasses the
generic driver. The purpose of this driver is to provide the platform
driver with the USB devices corresponding to the hub(s) (a hub
controller may provide multiple 'logical' hubs, e.g. one to support
USB 2.0 and another for USB 3.x).
Note: the driver currently only works with hubs connected directly
to a root hub, but it could be extended to support other
configurations if needed.
Co-developed-by: Ravi Chandra Sadineni <[email protected]>
Signed-off-by: Ravi Chandra Sadineni <[email protected]>
Signed-off-by: Matthias Kaehlcke <[email protected]>
---
Open question:
It seems to me there should be more options to configure the behavior
during system suspend. Currently we have 'keep the hub always powered'
and 'power the hub down unless a wakeup capable device is connected'.
The configuration is done through the boolean sysfs attribute
'always_powered_in_suspend'. Maybe this should be changed to
powered_in_suspend: yes/no/wakeup
or similar, with some flexibility when writing the boolean values.
Changes in v8:
- none
Changes in v7:
- don't declare stub for of_is_onboard_usb_hub() when
CONFIG_COMPILE_TEST is defined
Changes in v6:
- use 'companion-hub' to locate the platform device, instead of
scanning through the nodes of the parent
- added ABI documentation for 'always_powered_in_suspend'
- sysfs_emit() instead of sprintf() in always_powered_in_suspend_show()
- register sysfs attribute through driver.dev_groups
- evaluate return value of driver_attach() in _probe()
- use dev_warn() instead of WARN_ON() in _probe()
- include 'onboard_hub.h'
Changes in v5:
- the platform device is now instantiated from the same DT node
as the 'primary' USB hub device
- use the USB compatible strings for the platform device
- refactored _find_onboard_hub() to search the parents child
nodes for a platform device with a matching compatible string
- added exported function of_is_onboard_usb_hub() to allow other
drivers (like xhci_plat) to check if one of their child DT nodes
is a supported hub
- use late suspend to make sure info about wakeup enabled descendants
is updated
- call driver_attach() for the USB driver in onboard_hub_probe() to
make sure the driver is re-attached after the device_release_driver()
calls in onboard_hub_remove()
- renamed sysfs attribute 'power_off_in_suspend' to
'always_powered_in_suspend'
- added sysfs symlinks between platform device and USB devices
- marked 'onboard_hub_pm_ops' as __maybe_unused
- removed 'realtek' compatible string which is not needed at this
point
- fix log for regulator_disable() failure
Changes in v4:
- updated Kconfig documentation
- changed the loop in onboard_hub_remove() to release the hub lock
before unbinding the USB device and make self deadlock prevention
less clunky
- fixed return value in onboard_hub_usbdev_probe()
- added entry to MAINTAINERS file
Changes in v3:
- updated the commit message
- updated description in Kconfig
- remove include of 'core/usb.h'
- use 'is_powered_on' flag instead of 'has_wakeup_capable_descendants'
- added 'going_away' flag to struct onboard_hub
- don't allow adding new USB devices when the platform device is going away
- don't bother with deleting the list item in onboard_hub_remove_usbdev()
when the platform device is going away
- don't assume in onboard_hub_suspend() that all USB hub devices are
connected to the same controller
- removed unnecessary devm_kfree() from onboard_hub_remove_usbdev()
- fixed error handling in onboard_hub_remove_usbdev()
- use kstrtobool() instead of strtobool() in power_off_in_suspend_store()
- unbind USB devices in onboard_hub_remove() to avoid dangling references
to the platform device
- moved put_device() for platform device to _find_onboard_hub()
- changed return value of onboard_hub_remove_usbdev() to void
- evaluate return value of onboard_hub_add_usbdev()
- register 'power_off_in_suspend' as managed device attribute
- use USB_DEVICE macro instead manual initialization
- add unwinding to onboard_hub_init()
- updated MODULE_DESCRIPTION
- use module_init() instead of device_initcall()
Changes in v2:
- check wakeup enabled state of the USB controller instead of
using 'wakeup-source' property
- use sysfs attribute instead of DT property to determine if
the hub should be powered off at all during system suspend
- added missing brace in onboard_hub_suspend()
- updated commit message
- use pm_ptr for pm_ops as suggested by Alan
Changes in v1:
- renamed the driver to 'onboard_usb_hub'
- single file for platform and USB driver
- USB hub devices register with the platform device
- the DT includes a phandle of the platform device
- the platform device now controls when power is turned off
- the USB driver became a very thin subclass of the generic USB
driver
- enabled autosuspend support
.../sysfs-bus-platform-onboard-usb-hub | 8 +
MAINTAINERS | 7 +
drivers/usb/misc/Kconfig | 17 +
drivers/usb/misc/Makefile | 1 +
drivers/usb/misc/onboard_usb_hub.c | 415 ++++++++++++++++++
include/linux/usb/onboard_hub.h | 15 +
6 files changed, 463 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-bus-platform-onboard-usb-hub
create mode 100644 drivers/usb/misc/onboard_usb_hub.c
create mode 100644 include/linux/usb/onboard_hub.h
diff --git a/Documentation/ABI/testing/sysfs-bus-platform-onboard-usb-hub b/Documentation/ABI/testing/sysfs-bus-platform-onboard-usb-hub
new file mode 100644
index 000000000000..e981d83648e6
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-platform-onboard-usb-hub
@@ -0,0 +1,8 @@
+What: /sys/bus/platform/devices/<dev>/always_powered_in_suspend
+Date: March 2021
+KernelVersion: 5.13
+Contact: Matthias Kaehlcke <[email protected]>
+ [email protected]
+Description:
+ (RW) Controls whether the USB hub remains always powered
+ during system suspend or not.
\ No newline at end of file
diff --git a/MAINTAINERS b/MAINTAINERS
index d92f85ca831d..882ae6e378c5 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -13297,6 +13297,13 @@ S: Maintained
T: git git://linuxtv.org/media_tree.git
F: drivers/media/i2c/ov9734.c
+ONBOARD USB HUB DRIVER
+M: Matthias Kaehlcke <[email protected]>
+L: [email protected]
+S: Maintained
+F: Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
+F: drivers/usb/misc/onboard_usb_hub.c
+
ONENAND FLASH DRIVER
M: Kyungmin Park <[email protected]>
L: [email protected]
diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
index 8f1144359012..f534269fbb20 100644
--- a/drivers/usb/misc/Kconfig
+++ b/drivers/usb/misc/Kconfig
@@ -284,3 +284,20 @@ config BRCM_USB_PINMAP
This option enables support for remapping some USB external
signals, which are typically on dedicated pins on the chip,
to any gpio.
+
+config USB_ONBOARD_HUB
+ tristate "Onboard USB hub support"
+ depends on OF || COMPILE_TEST
+ help
+ Say Y here if you want to support discrete onboard USB hubs that
+ don't require an additional control bus for initialization, but
+ need some nontrivial form of initialization, such as enabling a
+ power regulator. An example for such a hub is the Realtek
+ RTS5411.
+
+ The driver can be configured to turn off the power of the hub
+ during system suspend. This may reduce power consumption while
+ the system is suspended.
+
+ To compile this driver as a module, choose M here: the
+ module will be called onboard_usb_hub.
diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
index 5f4e598573ab..2c5aec6f1b26 100644
--- a/drivers/usb/misc/Makefile
+++ b/drivers/usb/misc/Makefile
@@ -32,3 +32,4 @@ obj-$(CONFIG_USB_CHAOSKEY) += chaoskey.o
obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/
obj-$(CONFIG_USB_LINK_LAYER_TEST) += lvstest.o
obj-$(CONFIG_BRCM_USB_PINMAP) += brcmstb-usb-pinmap.o
+obj-$(CONFIG_USB_ONBOARD_HUB) += onboard_usb_hub.o
diff --git a/drivers/usb/misc/onboard_usb_hub.c b/drivers/usb/misc/onboard_usb_hub.c
new file mode 100644
index 000000000000..db926699a5ec
--- /dev/null
+++ b/drivers/usb/misc/onboard_usb_hub.c
@@ -0,0 +1,415 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for onboard USB hubs
+ *
+ * Copyright (c) 2020, Google LLC
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/suspend.h>
+#include <linux/sysfs.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/onboard_hub.h>
+
+static struct usb_device_driver onboard_hub_usbdev_driver;
+
+/************************** Platform driver **************************/
+
+struct udev_node {
+ struct usb_device *udev;
+ struct list_head list;
+};
+
+struct onboard_hub {
+ struct regulator *vdd;
+ struct device *dev;
+ bool always_powered_in_suspend;
+ bool is_powered_on;
+ bool going_away;
+ struct list_head udev_list;
+ struct mutex lock;
+};
+
+static int onboard_hub_power_on(struct onboard_hub *hub)
+{
+ int err;
+
+ err = regulator_enable(hub->vdd);
+ if (err) {
+ dev_err(hub->dev, "failed to enable regulator: %d\n", err);
+ return err;
+ }
+
+ hub->is_powered_on = true;
+
+ return 0;
+}
+
+static int onboard_hub_power_off(struct onboard_hub *hub)
+{
+ int err;
+
+ err = regulator_disable(hub->vdd);
+ if (err) {
+ dev_err(hub->dev, "failed to disable regulator: %d\n", err);
+ return err;
+ }
+
+ hub->is_powered_on = false;
+
+ return 0;
+}
+
+static int __maybe_unused onboard_hub_suspend(struct device *dev)
+{
+ struct onboard_hub *hub = dev_get_drvdata(dev);
+ struct udev_node *node;
+ bool power_off;
+ int rc = 0;
+
+ if (hub->always_powered_in_suspend)
+ return 0;
+
+ power_off = true;
+
+ mutex_lock(&hub->lock);
+
+ list_for_each_entry(node, &hub->udev_list, list) {
+ if (!device_may_wakeup(node->udev->bus->controller))
+ continue;
+
+ if (usb_wakeup_enabled_descendants(node->udev)) {
+ power_off = false;
+ break;
+ }
+ }
+
+ mutex_unlock(&hub->lock);
+
+ if (power_off)
+ rc = onboard_hub_power_off(hub);
+
+ return rc;
+}
+
+static int __maybe_unused onboard_hub_resume(struct device *dev)
+{
+ struct onboard_hub *hub = dev_get_drvdata(dev);
+ int rc = 0;
+
+ if (!hub->is_powered_on)
+ rc = onboard_hub_power_on(hub);
+
+ return rc;
+}
+
+static int onboard_hub_add_usbdev(struct onboard_hub *hub, struct usb_device *udev)
+{
+ struct udev_node *node;
+ char link_name[64];
+ int ret = 0;
+
+ mutex_lock(&hub->lock);
+
+ if (hub->going_away) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ node = devm_kzalloc(hub->dev, sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
+ node->udev = udev;
+
+ list_add(&node->list, &hub->udev_list);
+
+ snprintf(link_name, sizeof(link_name), "usb_dev.%s", dev_name(&udev->dev));
+ WARN_ON(sysfs_create_link(&hub->dev->kobj, &udev->dev.kobj, link_name));
+
+unlock:
+ mutex_unlock(&hub->lock);
+
+ return ret;
+}
+
+static void onboard_hub_remove_usbdev(struct onboard_hub *hub, struct usb_device *udev)
+{
+ struct udev_node *node;
+ char link_name[64];
+
+ snprintf(link_name, sizeof(link_name), "usb_dev.%s", dev_name(&udev->dev));
+ sysfs_remove_link(&hub->dev->kobj, link_name);
+
+ mutex_lock(&hub->lock);
+
+ list_for_each_entry(node, &hub->udev_list, list) {
+ if (node->udev == udev) {
+ list_del(&node->list);
+ break;
+ }
+ }
+
+ mutex_unlock(&hub->lock);
+}
+
+static ssize_t always_powered_in_suspend_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct onboard_hub *hub = dev_get_drvdata(dev);
+
+ return sysfs_emit(buf, "%d\n", hub->always_powered_in_suspend);
+}
+
+static ssize_t always_powered_in_suspend_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct onboard_hub *hub = dev_get_drvdata(dev);
+ bool val;
+ int ret;
+
+ ret = kstrtobool(buf, &val);
+ if (ret < 0)
+ return ret;
+
+ hub->always_powered_in_suspend = val;
+
+ return count;
+}
+static DEVICE_ATTR_RW(always_powered_in_suspend);
+
+static struct attribute *onboard_hub_attrs[] = {
+ &dev_attr_always_powered_in_suspend.attr,
+ NULL,
+};
+ATTRIBUTE_GROUPS(onboard_hub);
+
+static int onboard_hub_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct onboard_hub *hub;
+ int err;
+
+ hub = devm_kzalloc(dev, sizeof(*hub), GFP_KERNEL);
+ if (!hub)
+ return -ENOMEM;
+
+ hub->vdd = devm_regulator_get(dev, "vdd");
+ if (IS_ERR(hub->vdd))
+ return PTR_ERR(hub->vdd);
+
+ hub->dev = dev;
+ mutex_init(&hub->lock);
+ INIT_LIST_HEAD(&hub->udev_list);
+
+ dev_set_drvdata(dev, hub);
+
+ err = onboard_hub_power_on(hub);
+ if (err)
+ return err;
+
+ /*
+ * The USB driver might have been detached from the USB devices by
+ * onboard_hub_remove(), make sure to re-attach it if needed.
+ */
+ err = driver_attach(&onboard_hub_usbdev_driver.drvwrap.driver);
+ if (err) {
+ onboard_hub_power_off(hub);
+ return err;
+ }
+
+ return 0;
+}
+
+static int onboard_hub_remove(struct platform_device *pdev)
+{
+ struct onboard_hub *hub = dev_get_drvdata(&pdev->dev);
+ struct udev_node *node;
+ struct usb_device *udev;
+
+ hub->going_away = true;
+
+ mutex_lock(&hub->lock);
+
+ /* unbind the USB devices to avoid dangling references to this device */
+ while (!list_empty(&hub->udev_list)) {
+ node = list_first_entry(&hub->udev_list, struct udev_node, list);
+ udev = node->udev;
+
+ /*
+ * Unbinding the driver will call onboard_hub_remove_usbdev(),
+ * which acquires hub->lock. We must release the lock first.
+ */
+ get_device(&udev->dev);
+ mutex_unlock(&hub->lock);
+ device_release_driver(&udev->dev);
+ put_device(&udev->dev);
+ mutex_lock(&hub->lock);
+ }
+
+ mutex_unlock(&hub->lock);
+
+ return onboard_hub_power_off(hub);
+}
+
+static const struct of_device_id onboard_hub_match[] = {
+ { .compatible = "usbbda,411" },
+ { .compatible = "usbbda,5411" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, onboard_hub_match);
+
+bool of_is_onboard_usb_hub(const struct device_node *np)
+{
+ return !!of_match_node(onboard_hub_match, np);
+}
+EXPORT_SYMBOL_GPL(of_is_onboard_usb_hub);
+
+static const struct dev_pm_ops __maybe_unused onboard_hub_pm_ops = {
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(onboard_hub_suspend, onboard_hub_resume)
+};
+
+static struct platform_driver onboard_hub_driver = {
+ .probe = onboard_hub_probe,
+ .remove = onboard_hub_remove,
+
+ .driver = {
+ .name = "onboard-usb-hub",
+ .of_match_table = onboard_hub_match,
+ .pm = pm_ptr(&onboard_hub_pm_ops),
+ .dev_groups = onboard_hub_groups,
+ },
+};
+
+/************************** USB driver **************************/
+
+#define VENDOR_ID_REALTEK 0x0bda
+
+/*
+ * Returns the onboard_hub platform device that is associated with the USB
+ * device passed as parameter.
+ */
+static struct onboard_hub *_find_onboard_hub(struct device *dev)
+{
+ struct platform_device *pdev;
+ struct device_node *np;
+ phandle ph;
+
+ pdev = of_find_device_by_node(dev->of_node);
+ if (!pdev) {
+ if (of_property_read_u32(dev->of_node, "companion-hub", &ph)) {
+ dev_err(dev, "failed to read 'companion-hub' property\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ np = of_find_node_by_phandle(ph);
+ if (!np) {
+ dev_err(dev, "failed to find device node for companion hub\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdev = of_find_device_by_node(np);
+ of_node_put(np);
+
+ if (!pdev)
+ return ERR_PTR(-EPROBE_DEFER);
+ }
+
+ put_device(&pdev->dev);
+
+ return dev_get_drvdata(&pdev->dev);
+}
+
+static int onboard_hub_usbdev_probe(struct usb_device *udev)
+{
+ struct device *dev = &udev->dev;
+ struct onboard_hub *hub;
+ int err;
+
+ /* ignore supported hubs without device tree node */
+ if (!dev->of_node)
+ return -ENODEV;
+
+ hub = _find_onboard_hub(dev);
+ if (IS_ERR(hub))
+ return PTR_ERR(hub);
+
+ dev_set_drvdata(dev, hub);
+
+ err = onboard_hub_add_usbdev(hub, udev);
+ if (err)
+ return err;
+
+ err = sysfs_create_link(&udev->dev.kobj, &hub->dev->kobj, "onboard_hub_dev");
+ if (err)
+ dev_warn(&udev->dev, "failed to create symlink to platform device: %d\n", err);
+
+ return 0;
+}
+
+static void onboard_hub_usbdev_disconnect(struct usb_device *udev)
+{
+ struct onboard_hub *hub = dev_get_drvdata(&udev->dev);
+
+ sysfs_remove_link(&udev->dev.kobj, "onboard_hub_dev");
+
+ onboard_hub_remove_usbdev(hub, udev);
+}
+
+static const struct usb_device_id onboard_hub_id_table[] = {
+ { USB_DEVICE(VENDOR_ID_REALTEK, 0x0411) }, /* RTS5411 USB 3.0 */
+ { USB_DEVICE(VENDOR_ID_REALTEK, 0x5411) }, /* RTS5411 USB 2.0 */
+ {},
+};
+
+MODULE_DEVICE_TABLE(usb, onboard_hub_id_table);
+
+static struct usb_device_driver onboard_hub_usbdev_driver = {
+
+ .name = "onboard-usb-hub",
+ .probe = onboard_hub_usbdev_probe,
+ .disconnect = onboard_hub_usbdev_disconnect,
+ .generic_subclass = 1,
+ .supports_autosuspend = 1,
+ .id_table = onboard_hub_id_table,
+};
+
+/************************** Driver (de)registration **************************/
+
+static int __init onboard_hub_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&onboard_hub_driver);
+ if (ret)
+ return ret;
+
+ ret = usb_register_device_driver(&onboard_hub_usbdev_driver, THIS_MODULE);
+ if (ret)
+ platform_driver_unregister(&onboard_hub_driver);
+
+ return ret;
+}
+module_init(onboard_hub_init);
+
+static void __exit onboard_hub_exit(void)
+{
+ usb_deregister_device_driver(&onboard_hub_usbdev_driver);
+ platform_driver_unregister(&onboard_hub_driver);
+}
+module_exit(onboard_hub_exit);
+
+MODULE_AUTHOR("Matthias Kaehlcke <[email protected]>");
+MODULE_DESCRIPTION("Driver for discrete onboard USB hubs");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/usb/onboard_hub.h b/include/linux/usb/onboard_hub.h
new file mode 100644
index 000000000000..daaf42a0764f
--- /dev/null
+++ b/include/linux/usb/onboard_hub.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __LINUX_USB_ONBOARD_HUB_H
+#define __LINUX_USB_ONBOARD_HUB_H
+
+#if defined(CONFIG_USB_ONBOARD_HUB) || defined(CONFIG_COMPILE_TEST)
+bool of_is_onboard_usb_hub(const struct device_node *np);
+#else
+static inline bool of_is_onboard_usb_hub(const struct device_node *np)
+{
+ return false;
+}
+#endif
+
+#endif /* __LINUX_USB_ONBOARD_HUB_H */
--
2.31.1.498.g6c1eba8ee3d-goog
Hi Matthias,
I love your patch! Yet something to improve:
[auto build test ERROR on driver-core/driver-core-testing]
[also build test ERROR on linus/master v5.12 next-20210428]
[cannot apply to usb/usb-testing robh/for-next char-misc/char-misc-testing]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Matthias-Kaehlcke/USB-misc-Add-onboard_usb_hub-driver/20210429-024426
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git acd3d28594536e9096c1ea76c5867d8a68babef6
config: x86_64-randconfig-a003-20210428 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 87fc97169e7901dfe56ca0da0d92da0c02d2ef48)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install x86_64 cross compiling tool for clang build
# apt-get install binutils-x86-64-linux-gnu
# https://github.com/0day-ci/linux/commit/3910d7e75c8f52afa953dbac4dc3bd4469749da8
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Matthias-Kaehlcke/USB-misc-Add-onboard_usb_hub-driver/20210429-024426
git checkout 3910d7e75c8f52afa953dbac4dc3bd4469749da8
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=x86_64
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All errors (new ones prefixed by >>, old ones prefixed by <<):
>> ERROR: modpost: "of_is_onboard_usb_hub" [drivers/usb/host/xhci-plat-hcd.ko] undefined!
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
Hi Matthias,
I love your patch! Yet something to improve:
[auto build test ERROR on driver-core/driver-core-testing]
[also build test ERROR on linus/master v5.12 next-20210428]
[cannot apply to usb/usb-testing robh/for-next char-misc/char-misc-testing]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]
url: https://github.com/0day-ci/linux/commits/Matthias-Kaehlcke/USB-misc-Add-onboard_usb_hub-driver/20210429-024426
base: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git acd3d28594536e9096c1ea76c5867d8a68babef6
config: arm-randconfig-r032-20210428 (attached as .config)
compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/0day-ci/linux/commit/3910d7e75c8f52afa953dbac4dc3bd4469749da8
git remote add linux-review https://github.com/0day-ci/linux
git fetch --no-tags linux-review Matthias-Kaehlcke/USB-misc-Add-onboard_usb_hub-driver/20210429-024426
git checkout 3910d7e75c8f52afa953dbac4dc3bd4469749da8
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=arm
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All errors (new ones prefixed by >>):
arm-linux-gnueabi-ld: drivers/usb/host/xhci-plat.o: in function `xhci_plat_probe':
>> xhci-plat.c:(.text+0x1734): undefined reference to `of_is_onboard_usb_hub'
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]
On Wed, 28 Apr 2021 11:41:30 -0700, Matthias Kaehlcke wrote:
> Code for platform_device_create() and of_platform_device_destroy() is
> only generated if CONFIG_OF_ADDRESS=y. Add stubs to avoid unresolved
> symbols when CONFIG_OF_ADDRESS is not set.
>
> Signed-off-by: Matthias Kaehlcke <[email protected]>
> ---
>
> Changes in v8:
> - fixed C&P error in commit message
>
> Changes in v7:
> - none
>
> Changes in v6:
> - patch added to the series
>
> include/linux/of_platform.h | 22 ++++++++++++++++++----
> 1 file changed, 18 insertions(+), 4 deletions(-)
>
Acked-by: Rob Herring <[email protected]>