LinuxLists.cc - [PATCH V4 0/2] pinctrl: tegra: Add support for IO pad control

2016-11-24 08:55:55

Subject: [PATCH V4 0/2] pinctrl: tegra: Add support for IO pad control

NVIDIA Tegra124 and later SoCs support the multi-voltage level and
low power state of some of its IO pads. The IO pads can work in
the voltage of the 1.8V and 3.3V of IO power rail sources. When IO
interface are not used then IO pads can be configure in low power
state to reduce the power from that IO pads.

This series add the support of configuration of IO pad via pinctrl
framework. The io pad driver uses the tegra PMC interface.

---
This driver was sent earlier for review along with soc/tegra pmc
changes. During review, decided to first conclude in soc/tegra pmc
patches and then review this.

Thierry applied the pmc patches in the private tree
https://github.com/thierryreding/linux/tree/tegra186
and he wanted to have the patches for user of the new APIs so that
it can be pushed to mainline.

Sending the pinctrl driver. This needs Ack/reviewed from pinctrl subsystem
i.e. Linus Welleij to apply in the Thierry's T186 branch along with
PMC patches.

---
Changes from V1:
- use the regulator framework to get the IO voltage instead of table from
DT. The regulator handle is provided from DT.

Changes from V2:
- Nit fixes and variable/allocation optimisation as per review comment from
V2.

Changes from V3:
Use devm_regulator_get() instead of devm_regulator_get_optional().

Laxman Dewangan (2):
pinctrl: tegra: Add DT binding for io pads control
pinctrl: tegra: Add driver to configure voltage and power of io pads

.../bindings/pinctrl/nvidia,tegra-io-pad.txt | 126 +++++
drivers/pinctrl/tegra/Kconfig | 12 +
drivers/pinctrl/tegra/Makefile | 1 +
drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c | 530 +++++++++++++++++++++
4 files changed, 669 insertions(+)
create mode 100644 Documentation/devicetree/bindings/pinctrl/nvidia,tegra-io-pad.txt
create mode 100644 drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c

--
2.1.4

2016-11-24 08:56:08

by Laxman Dewangan

[permalink] [raw]

Subject: [PATCH V4 1/2] pinctrl: tegra: Add DT binding for io pads control

2016-11-24 08:59:30

by Laxman Dewangan

[permalink] [raw]

Subject: [PATCH V4 2/2] pinctrl: tegra: Add driver to configure voltage and power of io pads

NVIDIA Tegra124 and later SoCs support the multi-voltage level and
low power state of some of its IO pads. The IO pads can work in
the voltage of the 1.8V and 3.3V of IO voltage from IO power rail
sources. When IO interfaces are not used then IO pads can be
configure in low power state to reduce the power consumption from
that IO pads.

On Tegra124, the voltage level of IO power rail source is auto
detected by hardware(SoC) and hence it is only require to configure
in low power mode if IO pads are not used.

On T210 onwards, the auto-detection of voltage level from IO power
rail is removed from SoC and hence SW need to configure the PMC
register explicitly to set proper voltage in IO pads based on
IO rail power source voltage.

This driver adds the IO pad driver to configure the power state and
IO pad voltage based on the usage and power tree via pincontrol
framework. The configuration can be static and dynamic.

Signed-off-by: Laxman Dewangan <[email protected]>

---
Changes from V1:
- Dropped the custom properties to set pad voltage and use regulator.
- Added support for regulator to get vottage in boot and configure IO
pad voltage.
- Add support for callback to handle regulator notification and configure
IO pad voltage based on voltage change.

Changes from V2:
Mostly nit changes per Jon's feedback i.e. use macros for voltage, added
comment on macros, reduce the structure and variable name size, optimise
number of variables, and allocate memory for regulator info when it needed.

Changes from V3:
Use the devm_regulator_get() instead of devm_regulator_get_optional().

drivers/pinctrl/tegra/Kconfig | 12 +
drivers/pinctrl/tegra/Makefile | 1 +
drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c | 530 +++++++++++++++++++++++++++
3 files changed, 543 insertions(+)
create mode 100644 drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c

diff --git a/drivers/pinctrl/tegra/Kconfig b/drivers/pinctrl/tegra/Kconfig
index 24e20cc..6004e5c 100644
--- a/drivers/pinctrl/tegra/Kconfig
+++ b/drivers/pinctrl/tegra/Kconfig
@@ -23,6 +23,18 @@ config PINCTRL_TEGRA210
bool
select PINCTRL_TEGRA

+config PINCTRL_TEGRA_IO_PAD
+ bool "Tegra IO pad Control Driver"
+ depends on ARCH_TEGRA && REGULATOR
+ select PINCONF
+ select PINMUX
+ help
+ NVIDIA Tegra124/210 SoC has IO pads which supports multi-voltage
+ level of interfacing and deep power down mode of IO pads. The
+ voltage of IO pads are SW configurable based on IO rail of that
+ pads on T210. This driver provides the interface to change IO pad
+ voltage and power state via pincontrol interface.
+
config PINCTRL_TEGRA_XUSB
def_bool y if ARCH_TEGRA
select GENERIC_PHY
diff --git a/drivers/pinctrl/tegra/Makefile b/drivers/pinctrl/tegra/Makefile
index d9ea2be..3ebaaa2 100644
--- a/drivers/pinctrl/tegra/Makefile
+++ b/drivers/pinctrl/tegra/Makefile
@@ -4,4 +4,5 @@ obj-$(CONFIG_PINCTRL_TEGRA30) += pinctrl-tegra30.o
obj-$(CONFIG_PINCTRL_TEGRA114) += pinctrl-tegra114.o
obj-$(CONFIG_PINCTRL_TEGRA124) += pinctrl-tegra124.o
obj-$(CONFIG_PINCTRL_TEGRA210) += pinctrl-tegra210.o
+obj-$(CONFIG_PINCTRL_TEGRA_IO_PAD) += pinctrl-tegra-io-pad.o
obj-$(CONFIG_PINCTRL_TEGRA_XUSB) += pinctrl-tegra-xusb.o
diff --git a/drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c b/drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c
new file mode 100644
index 0000000..aab02d0
--- /dev/null
+++ b/drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c
@@ -0,0 +1,530 @@
+/*
+ * pinctrl-tegra-io-pad: IO PAD driver for configuration of IO rail and deep
+ * Power Down mode via pinctrl framework.
+ *
+ * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
+ *
+ * Author: Laxman Dewangan <[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 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pinctrl/pinctrl.h>
+#include <linux/pinctrl/pinconf-generic.h>
+#include <linux/pinctrl/pinconf.h>
+#include <linux/pinctrl/pinmux.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <soc/tegra/pmc.h>
+
+#include "../core.h"
+#include "../pinconf.h"
+#include "../pinctrl-utils.h"
+
+#define TEGRA_IO_RAIL_1800000UV 1800000
+#define TEGRA_IO_RAIL_3300000UV 3300000
+
+/* Covert IO voltage to IO pad voltage enum */
+#define tegra_io_uv_to_io_pads_uv(io_uv) \
+ (((io_uv) == TEGRA_IO_RAIL_1800000UV) ? \
+ TEGRA_IO_PAD_1800000UV : TEGRA_IO_PAD_3300000UV)
+
+#define tegra_io_voltage_is_valid(io_uv) \
+ ({ typeof(io_uv) io_uv_ = (io_uv); \
+ ((io_uv_ == TEGRA_IO_RAIL_1800000UV) || \
+ (io_uv_ == TEGRA_IO_RAIL_3300000UV)); })
+
+struct tegra_io_pads_cfg {
+ const char *name;
+ const unsigned int pins[1];
+ const char *vsupply;
+ enum tegra_io_pad id;
+ bool supports_low_power;
+};
+
+struct tegra_io_pads_soc_data {
+ const struct tegra_io_pads_cfg *cfg;
+ int num_cfg;
+ const struct pinctrl_pin_desc *desc;
+ int num_desc;
+};
+
+struct tegra_io_pads_info {
+ struct device *dev;
+ struct pinctrl_dev *pctl;
+ const struct tegra_io_pads_soc_data *soc_data;
+};
+
+struct tegra_io_pads_regulator_info {
+ struct tegra_io_pads_info *tiopi;
+ const struct tegra_io_pads_cfg *cfg;
+ struct regulator *regulator;
+ struct notifier_block regulator_nb;
+};
+
+static int tegra_io_pads_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+
+ return tiopi->soc_data->num_cfg;
+}
+
+static const char *tegra_io_pads_pinctrl_get_group_name(
+ struct pinctrl_dev *pctldev, unsigned int group)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+
+ return tiopi->soc_data->cfg[group].name;
+}
+
+static int tegra_io_pads_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
+ unsigned int group,
+ const unsigned int **pins,
+ unsigned int *num_pins)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+
+ *pins = tiopi->soc_data->cfg[group].pins;
+ *num_pins = 1;
+
+ return 0;
+}
+
+static const struct pinctrl_ops tegra_io_pads_pinctrl_ops = {
+ .get_groups_count = tegra_io_pads_pinctrl_get_groups_count,
+ .get_group_name = tegra_io_pads_pinctrl_get_group_name,
+ .get_group_pins = tegra_io_pads_pinctrl_get_group_pins,
+ .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
+ .dt_free_map = pinctrl_utils_free_map,
+};
+
+static int tegra_io_pads_pinconf_get(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *config)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+ int param = pinconf_to_config_param(*config);
+ const struct tegra_io_pads_cfg *cfg = &tiopi->soc_data->cfg[pin];
+ int arg = 0;
+ int ret;
+
+ switch (param) {
+ case PIN_CONFIG_LOW_POWER_MODE:
+ if (!cfg->supports_low_power) {
+ dev_err(tiopi->dev,
+ "IO pad %s does not support low power\n",
+ cfg->name);
+ return -EINVAL;
+ }
+
+ ret = tegra_io_pad_power_get_status(cfg->id);
+ if (ret < 0)
+ return ret;
+ arg = !ret;
+ break;
+
+ default:
+ dev_err(tiopi->dev, "The parameter %d not supported\n", param);
+ return -EINVAL;
+ }
+
+ *config = pinconf_to_config_packed(param, (u16)arg);
+
+ return 0;
+}
+
+static int tegra_io_pads_pinconf_set(struct pinctrl_dev *pctldev,
+ unsigned int pin, unsigned long *configs,
+ unsigned int num_configs)
+{
+ struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
+ const struct tegra_io_pads_cfg *cfg = &tiopi->soc_data->cfg[pin];
+ int i;
+
+ for (i = 0; i < num_configs; i++) {
+ int ret;
+ int param = pinconf_to_config_param(configs[i]);
+ u16 param_val = pinconf_to_config_argument(configs[i]);
+
+ switch (param) {
+ case PIN_CONFIG_LOW_POWER_MODE:
+ if (!cfg->supports_low_power) {
+ dev_err(tiopi->dev,
+ "IO pad %s does not support low power\n",
+ cfg->name);
+ return -EINVAL;
+ }
+ if (param_val)
+ ret = tegra_io_pad_power_disable(cfg->id);
+ else
+ ret = tegra_io_pad_power_enable(cfg->id);
+ if (ret < 0) {
+ dev_err(tiopi->dev,
+ "Failed to set DPD %d of io-pad %s: %d\n",
+ param_val, cfg->name, ret);
+ return ret;
+ }
+ break;
+
+ default:
+ dev_err(tiopi->dev, "The parameter %d not supported\n",
+ param);
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
+static const struct pinconf_ops tegra_io_pads_pinconf_ops = {
+ .pin_config_get = tegra_io_pads_pinconf_get,
+ .pin_config_set = tegra_io_pads_pinconf_set,
+};
+
+static struct pinctrl_desc tegra_io_pads_pinctrl_desc = {
+ .name = "pinctrl-tegra-io-pads",
+ .pctlops = &tegra_io_pads_pinctrl_ops,
+ .confops = &tegra_io_pads_pinconf_ops,
+};
+
+static int tegra_io_pads_rail_change_notify_cb(struct notifier_block *nb,
+ unsigned long event, void *data)
+{
+ struct tegra_io_pads_regulator_info *rinfo;
+ struct pre_voltage_change_data *vdata;
+ unsigned long int io_volt_uv;
+ enum tegra_io_pad_voltage pad_volt;
+ int ret;
+
+ rinfo = container_of(nb, struct tegra_io_pads_regulator_info,
+ regulator_nb);
+
+ switch (event) {
+ case REGULATOR_EVENT_PRE_VOLTAGE_CHANGE:
+ vdata = data;
+
+ if (!tegra_io_voltage_is_valid(vdata->old_uV) ||
+ !tegra_io_voltage_is_valid(vdata->min_uV)) {
+ dev_err(rinfo->tiopi->dev,
+ "IO rail %s voltage is not 1.8/3.3V: %lu:%lu\n",
+ rinfo->cfg->name, vdata->old_uV, vdata->min_uV);
+ return -EINVAL;
+ }
+
+ /**
+ * Change IO pad voltage before changing IO voltage when it
+ * changes from 1.8V to 3.3V
+ */
+ if (vdata->min_uV == TEGRA_IO_RAIL_1800000UV)
+ break;
+
+ ret = tegra_io_pad_set_voltage(rinfo->cfg->id,
+ TEGRA_IO_PAD_3300000UV);
+ if (ret < 0) {
+ dev_err(rinfo->tiopi->dev,
+ "Failed to set voltage %lu of pad %s: %d\n",
+ vdata->min_uV, rinfo->cfg->name, ret);
+ return ret;
+ }
+ break;
+
+ case REGULATOR_EVENT_VOLTAGE_CHANGE:
+ io_volt_uv = (unsigned long)data;
+ ret = tegra_io_pad_get_voltage(rinfo->cfg->id);
+ if (ret < 0) {
+ dev_err(rinfo->tiopi->dev,
+ "Failed to get IO pad voltage: %d\n", ret);
+ return ret;
+ }
+
+ if (!tegra_io_voltage_is_valid(io_volt_uv)) {
+ dev_err(rinfo->tiopi->dev,
+ "IO rail %s voltage is not 1.8/3.3V: %lu\n",
+ rinfo->cfg->name, io_volt_uv);
+ return -EINVAL;
+ }
+
+ /*
+ * If IO pad configuration matching with IO rail voltage then
+ * do nothing.
+ */
+ if (((io_volt_uv == TEGRA_IO_RAIL_1800000UV) &&
+ (ret == TEGRA_IO_PAD_1800000UV)) ||
+ ((io_volt_uv == TEGRA_IO_RAIL_3300000UV) &&
+ (ret == TEGRA_IO_PAD_3300000UV)))
+ break;
+
+ ret = tegra_io_pad_set_voltage(rinfo->cfg->id,
+ TEGRA_IO_PAD_1800000UV);
+ if (ret < 0) {
+ dev_err(rinfo->tiopi->dev,
+ "Failed to set voltage %lu of pad %s: %d\n",
+ vdata->min_uV, rinfo->cfg->name, ret);
+ return ret;
+ }
+ break;
+
+ case REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE:
+ io_volt_uv = (unsigned long)data;
+
+ if (!tegra_io_voltage_is_valid(io_volt_uv)) {
+ dev_err(rinfo->tiopi->dev,
+ "IO rail %s voltage is not 1.8/3.3V: %lu\n",
+ rinfo->cfg->name, io_volt_uv);
+ return -EINVAL;
+ }
+
+ pad_volt = tegra_io_uv_to_io_pads_uv(io_volt_uv);
+ ret = tegra_io_pad_set_voltage(rinfo->cfg->id, pad_volt);
+ if (ret < 0) {
+ dev_err(rinfo->tiopi->dev,
+ "Failed to set voltage %lu of pad %s: %d\n",
+ io_volt_uv, rinfo->cfg->name, ret);
+ return ret;
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+
+static int tegra_io_pads_pinctrl_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ const struct platform_device_id *id = platform_get_device_id(pdev);
+ const struct tegra_io_pads_soc_data *soc_data =
+ (const struct tegra_io_pads_soc_data *)id->driver_data;
+ struct tegra_io_pads_info *tiopi;
+ int ret, i;
+
+ if (!pdev->dev.parent->of_node) {
+ dev_err(dev, "PMC should be register from DT\n");
+ return -ENODEV;
+ }
+
+ tiopi = devm_kzalloc(dev, sizeof(*tiopi), GFP_KERNEL);
+ if (!tiopi)
+ return -ENOMEM;
+
+ tiopi->dev = &pdev->dev;
+ pdev->dev.of_node = pdev->dev.parent->of_node;
+ tiopi->soc_data = soc_data;
+
+ for (i = 0; i < soc_data->num_cfg; ++i) {
+ struct tegra_io_pads_regulator_info *rinfo;
+ enum tegra_io_pad_voltage pad_volt;
+ int io_volt_uv;
+
+ if (!soc_data->cfg[i].vsupply)
+ continue;
+
+ rinfo = devm_kzalloc(dev, sizeof(*rinfo), GFP_KERNEL);
+ if (!rinfo)
+ return -ENOMEM;
+
+ rinfo->tiopi = tiopi;
+ rinfo->cfg = &soc_data->cfg[i];
+
+ rinfo->regulator = devm_regulator_get(dev,
+ soc_data->cfg[i].vsupply);
+ if (IS_ERR(rinfo->regulator)) {
+ ret = PTR_ERR(rinfo->regulator);
+ if (ret == -EPROBE_DEFER)
+ return ret;
+ continue;
+ }
+
+ io_volt_uv = regulator_get_voltage(rinfo->regulator);
+ if (io_volt_uv < 0) {
+ dev_warn(dev, "Failed to get voltage for rail %s: %d\n",
+ soc_data->cfg[i].vsupply, io_volt_uv);
+ continue;
+ }
+
+ if (!tegra_io_voltage_is_valid(io_volt_uv)) {
+ dev_warn(dev, "IO rail %s voltage is not 1.8/3.3V: %d\n",
+ soc_data->cfg[i].vsupply, io_volt_uv);
+ continue;
+ }
+
+ pad_volt = tegra_io_uv_to_io_pads_uv(io_volt_uv);
+ ret = tegra_io_pad_set_voltage(soc_data->cfg[i].id, pad_volt);
+ if (ret < 0) {
+ dev_err(dev, "Failed to set voltage %d of pad %s: %d\n",
+ io_volt_uv, soc_data->cfg[i].name, ret);
+ return ret;
+ }
+
+ rinfo->regulator_nb.notifier_call =
+ tegra_io_pads_rail_change_notify_cb;
+ ret = devm_regulator_register_notifier(rinfo->regulator,
+ &rinfo->regulator_nb);
+ if (ret < 0) {
+ dev_err(dev, "Failed to register regulator %s notifier: %d\n",
+ soc_data->cfg[i].name, ret);
+ return ret;
+ }
+ }
+
+ tegra_io_pads_pinctrl_desc.pins = tiopi->soc_data->desc;
+ tegra_io_pads_pinctrl_desc.npins = tiopi->soc_data->num_desc;
+ platform_set_drvdata(pdev, tiopi);
+
+ tiopi->pctl = devm_pinctrl_register(dev, &tegra_io_pads_pinctrl_desc,
+ tiopi);
+ if (IS_ERR(tiopi->pctl)) {
+ ret = PTR_ERR(tiopi->pctl);
+ dev_err(dev, "Failed to register io-pad pinctrl driver: %d\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+#define TEGRA124_PAD_INFO_TABLE(_entry_) \
+ _entry_(0, "audio", AUDIO, true, NULL), \
+ _entry_(1, "bb", BB, true, NULL), \
+ _entry_(2, "cam", CAM, true, NULL), \
+ _entry_(3, "comp", COMP, true, NULL), \
+ _entry_(4, "csia", CSIA, true, NULL), \
+ _entry_(5, "csib", CSIB, true, NULL), \
+ _entry_(6, "csie", CSIE, true, NULL), \
+ _entry_(7, "dsi", DSI, true, NULL), \
+ _entry_(8, "dsib", DSIB, true, NULL), \
+ _entry_(9, "dsic", DSIC, true, NULL), \
+ _entry_(10, "dsid", DSID, true, NULL), \
+ _entry_(11, "hdmi", HDMI, true, NULL), \
+ _entry_(12, "hsic", HSIC, true, NULL), \
+ _entry_(13, "hv", HV, true, NULL), \
+ _entry_(14, "lvds", LVDS, true, NULL), \
+ _entry_(15, "mipi-bias", MIPI_BIAS, true, NULL), \
+ _entry_(16, "nand", NAND, true, NULL), \
+ _entry_(17, "pex-bias", PEX_BIAS, true, NULL), \
+ _entry_(18, "pex-clk1", PEX_CLK1, true, NULL), \
+ _entry_(19, "pex-clk2", PEX_CLK2, true, NULL), \
+ _entry_(20, "pex-ctrl", PEX_CNTRL, true, NULL), \
+ _entry_(21, "sdmmc1", SDMMC1, true, NULL), \
+ _entry_(22, "sdmmc3", SDMMC3, true, NULL), \
+ _entry_(23, "sdmmc4", SDMMC4, true, NULL), \
+ _entry_(24, "sys-ddc", SYS_DDC, true, NULL), \
+ _entry_(25, "uart", UART, true, NULL), \
+ _entry_(26, "usb0", USB0, true, NULL), \
+ _entry_(27, "usb1", USB1, true, NULL), \
+ _entry_(28, "usb2", USB2, true, NULL), \
+ _entry_(29, "usb-bias", USB_BIAS, true, NULL)
+
+#define TEGRA210_PAD_INFO_TABLE(_entry_) \
+ _entry_(0, "audio", AUDIO, true, "vddio-audio"), \
+ _entry_(1, "audio-hv", AUDIO_HV, true, "vddio-audio-hv"), \
+ _entry_(2, "cam", CAM, true, "vddio-cam"), \
+ _entry_(3, "csia", CSIA, true, NULL), \
+ _entry_(4, "csib", CSIB, true, NULL), \
+ _entry_(5, "csic", CSIC, true, NULL), \
+ _entry_(6, "csid", CSID, true, NULL), \
+ _entry_(7, "csie", CSIE, true, NULL), \
+ _entry_(8, "csif", CSIF, true, NULL), \
+ _entry_(9, "dbg", DBG, true, "vddio-dbg"), \
+ _entry_(10, "debug-nonao", DEBUG_NONAO, true, NULL), \
+ _entry_(11, "dmic", DMIC, true, "vddio-dmic"), \
+ _entry_(12, "dp", DP, true, NULL), \
+ _entry_(13, "dsi", DSI, true, NULL), \
+ _entry_(14, "dsib", DSIB, true, NULL), \
+ _entry_(15, "dsic", DSIC, true, NULL), \
+ _entry_(16, "dsid", DSID, true, NULL), \
+ _entry_(17, "emmc", SDMMC4, true, NULL), \
+ _entry_(18, "emmc2", EMMC2, true, NULL), \
+ _entry_(19, "gpio", GPIO, true, "vddio-gpio"), \
+ _entry_(20, "hdmi", HDMI, true, NULL), \
+ _entry_(21, "hsic", HSIC, true, NULL), \
+ _entry_(22, "lvds", LVDS, true, NULL), \
+ _entry_(23, "mipi-bias", MIPI_BIAS, true, NULL), \
+ _entry_(24, "pex-bias", PEX_BIAS, true, NULL), \
+ _entry_(25, "pex-clk1", PEX_CLK1, true, NULL), \
+ _entry_(26, "pex-clk2", PEX_CLK2, true, NULL), \
+ _entry_(27, "pex-ctrl", PEX_CNTRL, false, "vddio-pex-ctrl"), \
+ _entry_(28, "sdmmc1", SDMMC1, true, "vddio-sdmmc1"), \
+ _entry_(29, "sdmmc3", SDMMC3, true, "vddio-sdmmc3"), \
+ _entry_(30, "spi", SPI, true, "vddio-spi"), \
+ _entry_(31, "spi-hv", SPI_HV, true, "vddio-spi-hv"), \
+ _entry_(32, "uart", UART, true, "vddio-uart"), \
+ _entry_(33, "usb0", USB0, true, NULL), \
+ _entry_(34, "usb1", USB1, true, NULL), \
+ _entry_(35, "usb2", USB2, true, NULL), \
+ _entry_(36, "usb3", USB3, true, NULL), \
+ _entry_(37, "usb-bias", USB_BIAS, true, NULL)
+
+#define TEGRA_IO_PAD_INFO(_pin, _name, _id, _lpstate, _vsupply) \
+ { \
+ .name = _name, \
+ .pins = {(_pin)}, \
+ .id = TEGRA_IO_PAD_##_id, \
+ .vsupply = (_vsupply), \
+ .supports_low_power = (_lpstate), \
+ }
+
+static const struct tegra_io_pads_cfg tegra124_io_pads_cfg_info[] = {
+ TEGRA124_PAD_INFO_TABLE(TEGRA_IO_PAD_INFO),
+};
+
+static const struct tegra_io_pads_cfg tegra210_io_pads_cfg_info[] = {
+ TEGRA210_PAD_INFO_TABLE(TEGRA_IO_PAD_INFO),
+};
+
+#define TEGRA_IO_PAD_DESC(_pin, _name, _id, _lpstate, _vsupply) \
+ PINCTRL_PIN(_pin, _name)
+
+static const struct pinctrl_pin_desc tegra124_io_pads_pinctrl_desc[] = {
+ TEGRA124_PAD_INFO_TABLE(TEGRA_IO_PAD_DESC),
+};
+
+static const struct pinctrl_pin_desc tegra210_io_pads_pinctrl_desc[] = {
+ TEGRA210_PAD_INFO_TABLE(TEGRA_IO_PAD_DESC),
+};
+
+static const struct tegra_io_pads_soc_data tegra124_io_pad_soc_data = {
+ .desc = tegra124_io_pads_pinctrl_desc,
+ .num_desc = ARRAY_SIZE(tegra124_io_pads_pinctrl_desc),
+ .cfg = tegra124_io_pads_cfg_info,
+ .num_cfg = ARRAY_SIZE(tegra124_io_pads_cfg_info),
+};
+
+static const struct tegra_io_pads_soc_data tegra210_io_pad_soc_data = {
+ .desc = tegra210_io_pads_pinctrl_desc,
+ .num_desc = ARRAY_SIZE(tegra210_io_pads_pinctrl_desc),
+ .cfg = tegra210_io_pads_cfg_info,
+ .num_cfg = ARRAY_SIZE(tegra210_io_pads_cfg_info),
+};
+
+static const struct platform_device_id tegra_io_pads_dev_id[] = {
+ {
+ .name = "pinctrl-t124-io-pad",
+ .driver_data = (kernel_ulong_t)&tegra124_io_pad_soc_data,
+ }, {
+ .name = "pinctrl-t210-io-pad",
+ .driver_data = (kernel_ulong_t)&tegra210_io_pad_soc_data,
+ }, {
+ },
+};
+MODULE_DEVICE_TABLE(platform, tegra_io_pads_dev_id);
+
+static struct platform_driver tegra_io_pads_pinctrl_driver = {
+ .driver = {
+ .name = "pinctrl-tegra-io-pad",
+ },
+ .probe = tegra_io_pads_pinctrl_probe,
+ .id_table = tegra_io_pads_dev_id,
+};
+
+module_platform_driver(tegra_io_pads_pinctrl_driver);
+
+MODULE_DESCRIPTION("NVIDIA TEGRA IO pad Control Driver");
+MODULE_AUTHOR("Laxman Dewangan <[email protected]>");
+MODULE_LICENSE("GPL v2");
--
2.1.4

2016-11-25 09:58:08

by Thierry Reding

[permalink] [raw]

Subject: Re: [PATCH V4 2/2] pinctrl: tegra: Add driver to configure voltage and power of io pads

On Thu, Nov 24, 2016 at 02:08:54PM +0530, Laxman Dewangan wrote:
> NVIDIA Tegra124 and later SoCs support the multi-voltage level and
> low power state of some of its IO pads. The IO pads can work in
> the voltage of the 1.8V and 3.3V of IO voltage from IO power rail
> sources. When IO interfaces are not used then IO pads can be
> configure in low power state to reduce the power consumption from
> that IO pads.
>
> On Tegra124, the voltage level of IO power rail source is auto
> detected by hardware(SoC) and hence it is only require to configure
> in low power mode if IO pads are not used.
>
> On T210 onwards, the auto-detection of voltage level from IO power
> rail is removed from SoC and hence SW need to configure the PMC
> register explicitly to set proper voltage in IO pads based on
> IO rail power source voltage.
>
> This driver adds the IO pad driver to configure the power state and
> IO pad voltage based on the usage and power tree via pincontrol
> framework. The configuration can be static and dynamic.
>
> Signed-off-by: Laxman Dewangan <[email protected]>
>
> ---
> Changes from V1:
> - Dropped the custom properties to set pad voltage and use regulator.
> - Added support for regulator to get vottage in boot and configure IO
> pad voltage.
> - Add support for callback to handle regulator notification and configure
> IO pad voltage based on voltage change.
>
> Changes from V2:
> Mostly nit changes per Jon's feedback i.e. use macros for voltage, added
> comment on macros, reduce the structure and variable name size, optimise
> number of variables, and allocate memory for regulator info when it needed.
>
> Changes from V3:
> Use the devm_regulator_get() instead of devm_regulator_get_optional().
>
> drivers/pinctrl/tegra/Kconfig | 12 +
> drivers/pinctrl/tegra/Makefile | 1 +
> drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c | 530 +++++++++++++++++++++++++++
> 3 files changed, 543 insertions(+)
> create mode 100644 drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c
>
> diff --git a/drivers/pinctrl/tegra/Kconfig b/drivers/pinctrl/tegra/Kconfig
> index 24e20cc..6004e5c 100644
> --- a/drivers/pinctrl/tegra/Kconfig
> +++ b/drivers/pinctrl/tegra/Kconfig
> @@ -23,6 +23,18 @@ config PINCTRL_TEGRA210
> bool
> select PINCTRL_TEGRA
>
> +config PINCTRL_TEGRA_IO_PAD
> + bool "Tegra IO pad Control Driver"
> + depends on ARCH_TEGRA && REGULATOR
> + select PINCONF
> + select PINMUX
> + help
> + NVIDIA Tegra124/210 SoC has IO pads which supports multi-voltage
> + level of interfacing and deep power down mode of IO pads. The
> + voltage of IO pads are SW configurable based on IO rail of that
> + pads on T210. This driver provides the interface to change IO pad
> + voltage and power state via pincontrol interface.

This has a lot of chip-specific text. Will all of that have to be
updated if support for new chips is added?

> +
> config PINCTRL_TEGRA_XUSB
> def_bool y if ARCH_TEGRA
> select GENERIC_PHY
> diff --git a/drivers/pinctrl/tegra/Makefile b/drivers/pinctrl/tegra/Makefile
> index d9ea2be..3ebaaa2 100644
> --- a/drivers/pinctrl/tegra/Makefile
> +++ b/drivers/pinctrl/tegra/Makefile
> @@ -4,4 +4,5 @@ obj-$(CONFIG_PINCTRL_TEGRA30) += pinctrl-tegra30.o
> obj-$(CONFIG_PINCTRL_TEGRA114) += pinctrl-tegra114.o
> obj-$(CONFIG_PINCTRL_TEGRA124) += pinctrl-tegra124.o
> obj-$(CONFIG_PINCTRL_TEGRA210) += pinctrl-tegra210.o
> +obj-$(CONFIG_PINCTRL_TEGRA_IO_PAD) += pinctrl-tegra-io-pad.o
> obj-$(CONFIG_PINCTRL_TEGRA_XUSB) += pinctrl-tegra-xusb.o
> diff --git a/drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c b/drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c
> new file mode 100644
> index 0000000..aab02d0
> --- /dev/null
> +++ b/drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c
> @@ -0,0 +1,530 @@
> +/*
> + * pinctrl-tegra-io-pad: IO PAD driver for configuration of IO rail and deep
> + * Power Down mode via pinctrl framework.
> + *
> + * Copyright (C) 2016 NVIDIA CORPORATION. All rights reserved.
> + *
> + * Author: Laxman Dewangan <[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 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/pinctrl/pinctrl.h>
> +#include <linux/pinctrl/pinconf-generic.h>
> +#include <linux/pinctrl/pinconf.h>
> +#include <linux/pinctrl/pinmux.h>
> +#include <linux/platform_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <soc/tegra/pmc.h>

Have you considered moving this code into the PMC driver? It seems a
little over the top to go through all of the platform device creation
and driver registration dance only to call into a public API later on.

> +#include "../core.h"
> +#include "../pinconf.h"
> +#include "../pinctrl-utils.h"
> +
> +#define TEGRA_IO_RAIL_1800000UV 1800000
> +#define TEGRA_IO_RAIL_3300000UV 3300000

Is there really a point in having these defines? They are really long
and effectively don't carry more information than just the plain
numbers.

> +
> +/* Covert IO voltage to IO pad voltage enum */

Convert

> +#define tegra_io_uv_to_io_pads_uv(io_uv) \
> + (((io_uv) == TEGRA_IO_RAIL_1800000UV) ? \
> + TEGRA_IO_PAD_1800000UV : TEGRA_IO_PAD_3300000UV)
> +
> +#define tegra_io_voltage_is_valid(io_uv) \
> + ({ typeof(io_uv) io_uv_ = (io_uv); \
> + ((io_uv_ == TEGRA_IO_RAIL_1800000UV) || \
> + (io_uv_ == TEGRA_IO_RAIL_3300000UV)); })
>
Maybe make both of these static inline functions to improve readability?
I find the above very hard to read.

> +struct tegra_io_pads_cfg {
> + const char *name;
> + const unsigned int pins[1];
> + const char *vsupply;
> + enum tegra_io_pad id;
> + bool supports_low_power;
> +};

Pretty much everything in this driver operates on single pads, so it's a
little confusing to use the "pads" in the names. I think it would be
more appropriate to name this structure tegra_io_pad_cfg because it is
configuration data associated with a single pad.

> +
> +struct tegra_io_pads_soc_data {

I think the _data suffix is redundant and can be dropped.

The use of "pads" in this structure name is fine because it really does
contain data for multiple pads.

> + const struct tegra_io_pads_cfg *cfg;
> + int num_cfg;

This can be unsigned int. Also I think it's more common to use the
plural in these (cfgs, num_cfgs).

> + const struct pinctrl_pin_desc *desc;
> + int num_desc;

Same here.

> +};
> +
> +struct tegra_io_pads_info {
> + struct device *dev;
> + struct pinctrl_dev *pctl;
> + const struct tegra_io_pads_soc_data *soc_data;

If you drop the _data suffix from the type I think you can also drop it
from the field name.

"pads" is fine here as well because, again, this deals with multiple
pads.

> +};
> +
> +struct tegra_io_pads_regulator_info {
> + struct tegra_io_pads_info *tiopi;
> + const struct tegra_io_pads_cfg *cfg;
> + struct regulator *regulator;
> + struct notifier_block regulator_nb;

The regulator_ prefix is redundent here. It's contained within a
structure named tegra_io_pads_regulator_info, so it's fairly obvious
that this is related to regulators.

This deals only with a single pad, so tegra_io_pad_regulator_info would
be less confusing, I think. Perhaps even drop the _info suffix while at
it because it doesn't add anything useful.

> +};
> +
> +static int tegra_io_pads_pinctrl_get_groups_count(struct pinctrl_dev *pctldev)
> +{
> + struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
> +
> + return tiopi->soc_data->num_cfg;
> +}
> +
> +static const char *tegra_io_pads_pinctrl_get_group_name(
> + struct pinctrl_dev *pctldev, unsigned int group)
> +{
> + struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
> +
> + return tiopi->soc_data->cfg[group].name;
> +}
> +
> +static int tegra_io_pads_pinctrl_get_group_pins(struct pinctrl_dev *pctldev,
> + unsigned int group,
> + const unsigned int **pins,
> + unsigned int *num_pins)
> +{
> + struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
> +
> + *pins = tiopi->soc_data->cfg[group].pins;
> + *num_pins = 1;
> +
> + return 0;
> +}
> +
> +static const struct pinctrl_ops tegra_io_pads_pinctrl_ops = {
> + .get_groups_count = tegra_io_pads_pinctrl_get_groups_count,
> + .get_group_name = tegra_io_pads_pinctrl_get_group_name,
> + .get_group_pins = tegra_io_pads_pinctrl_get_group_pins,
> + .dt_node_to_map = pinconf_generic_dt_node_to_map_pin,
> + .dt_free_map = pinctrl_utils_free_map,
> +};

Nit: I don't think this padding using tabs increases readability.

> +
> +static int tegra_io_pads_pinconf_get(struct pinctrl_dev *pctldev,
> + unsigned int pin, unsigned long *config)
> +{
> + struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
> + int param = pinconf_to_config_param(*config);
> + const struct tegra_io_pads_cfg *cfg = &tiopi->soc_data->cfg[pin];
> + int arg = 0;

Why not make that a u16...

> + int ret;
> +
> + switch (param) {
> + case PIN_CONFIG_LOW_POWER_MODE:
> + if (!cfg->supports_low_power) {
> + dev_err(tiopi->dev,
> + "IO pad %s does not support low power\n",
> + cfg->name);
> + return -EINVAL;
> + }
> +
> + ret = tegra_io_pad_power_get_status(cfg->id);
> + if (ret < 0)
> + return ret;
> + arg = !ret;
> + break;
> +
> + default:
> + dev_err(tiopi->dev, "The parameter %d not supported\n", param);
> + return -EINVAL;
> + }
> +
> + *config = pinconf_to_config_packed(param, (u16)arg);

... and avoid the cast here?

> +
> + return 0;
> +}
> +
> +static int tegra_io_pads_pinconf_set(struct pinctrl_dev *pctldev,
> + unsigned int pin, unsigned long *configs,
> + unsigned int num_configs)

This last line is not quite properly aligned.

> +{
> + struct tegra_io_pads_info *tiopi = pinctrl_dev_get_drvdata(pctldev);
> + const struct tegra_io_pads_cfg *cfg = &tiopi->soc_data->cfg[pin];
> + int i;

This should be unsigned.

> +
> + for (i = 0; i < num_configs; i++) {
> + int ret;
> + int param = pinconf_to_config_param(configs[i]);

The function returns an enum pin_config_param, why not use that as the
type?

> + u16 param_val = pinconf_to_config_argument(configs[i]);
> +
> + switch (param) {
> + case PIN_CONFIG_LOW_POWER_MODE:
> + if (!cfg->supports_low_power) {
> + dev_err(tiopi->dev,
> + "IO pad %s does not support low power\n",
> + cfg->name);
> + return -EINVAL;
> + }
> + if (param_val)
> + ret = tegra_io_pad_power_disable(cfg->id);
> + else
> + ret = tegra_io_pad_power_enable(cfg->id);
> + if (ret < 0) {
> + dev_err(tiopi->dev,
> + "Failed to set DPD %d of io-pad %s: %d\n",
> + param_val, cfg->name, ret);
> + return ret;
> + }
> + break;
> +
> + default:
> + dev_err(tiopi->dev, "The parameter %d not supported\n",
> + param);
> + return -EINVAL;
> + }
> + }
> +
> + return 0;
> +}
> +
> +static const struct pinconf_ops tegra_io_pads_pinconf_ops = {
> + .pin_config_get = tegra_io_pads_pinconf_get,
> + .pin_config_set = tegra_io_pads_pinconf_set,
> +};
> +
> +static struct pinctrl_desc tegra_io_pads_pinctrl_desc = {
> + .name = "pinctrl-tegra-io-pads",
> + .pctlops = &tegra_io_pads_pinctrl_ops,
> + .confops = &tegra_io_pads_pinconf_ops,
> +};
> +
> +static int tegra_io_pads_rail_change_notify_cb(struct notifier_block *nb,
> + unsigned long event, void *data)
> +{
> + struct tegra_io_pads_regulator_info *rinfo;
> + struct pre_voltage_change_data *vdata;
> + unsigned long int io_volt_uv;

You can drop the int, it's implied by long.

> + enum tegra_io_pad_voltage pad_volt;
> + int ret;
> +
> + rinfo = container_of(nb, struct tegra_io_pads_regulator_info,
> + regulator_nb);
> +
> + switch (event) {
> + case REGULATOR_EVENT_PRE_VOLTAGE_CHANGE:
> + vdata = data;
> +
> + if (!tegra_io_voltage_is_valid(vdata->old_uV) ||
> + !tegra_io_voltage_is_valid(vdata->min_uV)) {
> + dev_err(rinfo->tiopi->dev,
> + "IO rail %s voltage is not 1.8/3.3V: %lu:%lu\n",
> + rinfo->cfg->name, vdata->old_uV, vdata->min_uV);
> + return -EINVAL;
> + }
> +
> + /**
> + * Change IO pad voltage before changing IO voltage when it
> + * changes from 1.8V to 3.3V
> + */
> + if (vdata->min_uV == TEGRA_IO_RAIL_1800000UV)
> + break;
> +
> + ret = tegra_io_pad_set_voltage(rinfo->cfg->id,
> + TEGRA_IO_PAD_3300000UV);
> + if (ret < 0) {
> + dev_err(rinfo->tiopi->dev,
> + "Failed to set voltage %lu of pad %s: %d\n",
> + vdata->min_uV, rinfo->cfg->name, ret);
> + return ret;
> + }
> + break;
> +
> + case REGULATOR_EVENT_VOLTAGE_CHANGE:
> + io_volt_uv = (unsigned long)data;
> + ret = tegra_io_pad_get_voltage(rinfo->cfg->id);
> + if (ret < 0) {
> + dev_err(rinfo->tiopi->dev,
> + "Failed to get IO pad voltage: %d\n", ret);
> + return ret;
> + }

Might be worth reassigning ret to a variable of type enum
tegra_io_pad_voltage because...

> +
> + if (!tegra_io_voltage_is_valid(io_volt_uv)) {
> + dev_err(rinfo->tiopi->dev,
> + "IO rail %s voltage is not 1.8/3.3V: %lu\n",
> + rinfo->cfg->name, io_volt_uv);
> + return -EINVAL;
> + }
> +
> + /*
> + * If IO pad configuration matching with IO rail voltage then
> + * do nothing.
> + */
> + if (((io_volt_uv == TEGRA_IO_RAIL_1800000UV) &&
> + (ret == TEGRA_IO_PAD_1800000UV)) ||
> + ((io_volt_uv == TEGRA_IO_RAIL_3300000UV) &&
> + (ret == TEGRA_IO_PAD_3300000UV)))
> + break;

... if somebody ever inserted code between the above and this, they
might be overwriting ret.

> +
> + ret = tegra_io_pad_set_voltage(rinfo->cfg->id,
> + TEGRA_IO_PAD_1800000UV);
> + if (ret < 0) {
> + dev_err(rinfo->tiopi->dev,
> + "Failed to set voltage %lu of pad %s: %d\n",
> + vdata->min_uV, rinfo->cfg->name, ret);

You might want to add the units of the voltage to avoid confusion. Same
in a couple more messages above and below.

> + return ret;
> + }
> + break;
> +
> + case REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE:
> + io_volt_uv = (unsigned long)data;
> +
> + if (!tegra_io_voltage_is_valid(io_volt_uv)) {
> + dev_err(rinfo->tiopi->dev,
> + "IO rail %s voltage is not 1.8/3.3V: %lu\n",
> + rinfo->cfg->name, io_volt_uv);
> + return -EINVAL;
> + }
> +
> + pad_volt = tegra_io_uv_to_io_pads_uv(io_volt_uv);
> + ret = tegra_io_pad_set_voltage(rinfo->cfg->id, pad_volt);
> + if (ret < 0) {
> + dev_err(rinfo->tiopi->dev,
> + "Failed to set voltage %lu of pad %s: %d\n",
> + io_volt_uv, rinfo->cfg->name, ret);
> + return ret;
> + }
> + break;
> +
> + default:
> + break;
> + }
> +
> + return NOTIFY_OK;
> +}
> +
> +static int tegra_io_pads_pinctrl_probe(struct platform_device *pdev)
> +{
> + struct device *dev = &pdev->dev;
> + const struct platform_device_id *id = platform_get_device_id(pdev);
> + const struct tegra_io_pads_soc_data *soc_data =
> + (const struct tegra_io_pads_soc_data *)id->driver_data;
> + struct tegra_io_pads_info *tiopi;
> + int ret, i;
> +
> + if (!pdev->dev.parent->of_node) {
> + dev_err(dev, "PMC should be register from DT\n");
> + return -ENODEV;
> + }
> +
> + tiopi = devm_kzalloc(dev, sizeof(*tiopi), GFP_KERNEL);
> + if (!tiopi)
> + return -ENOMEM;
> +
> + tiopi->dev = &pdev->dev;
> + pdev->dev.of_node = pdev->dev.parent->of_node;
> + tiopi->soc_data = soc_data;
> +
> + for (i = 0; i < soc_data->num_cfg; ++i) {
> + struct tegra_io_pads_regulator_info *rinfo;
> + enum tegra_io_pad_voltage pad_volt;
> + int io_volt_uv;
> +
> + if (!soc_data->cfg[i].vsupply)
> + continue;
> +
> + rinfo = devm_kzalloc(dev, sizeof(*rinfo), GFP_KERNEL);
> + if (!rinfo)
> + return -ENOMEM;
> +
> + rinfo->tiopi = tiopi;
> + rinfo->cfg = &soc_data->cfg[i];
> +
> + rinfo->regulator = devm_regulator_get(dev,
> + soc_data->cfg[i].vsupply);
> + if (IS_ERR(rinfo->regulator)) {
> + ret = PTR_ERR(rinfo->regulator);
> + if (ret == -EPROBE_DEFER)
> + return ret;
> + continue;
> + }
> +
> + io_volt_uv = regulator_get_voltage(rinfo->regulator);
> + if (io_volt_uv < 0) {
> + dev_warn(dev, "Failed to get voltage for rail %s: %d\n",
> + soc_data->cfg[i].vsupply, io_volt_uv);
> + continue;
> + }
> +
> + if (!tegra_io_voltage_is_valid(io_volt_uv)) {
> + dev_warn(dev, "IO rail %s voltage is not 1.8/3.3V: %d\n",
> + soc_data->cfg[i].vsupply, io_volt_uv);
> + continue;
> + }
> +
> + pad_volt = tegra_io_uv_to_io_pads_uv(io_volt_uv);
> + ret = tegra_io_pad_set_voltage(soc_data->cfg[i].id, pad_volt);
> + if (ret < 0) {
> + dev_err(dev, "Failed to set voltage %d of pad %s: %d\n",
> + io_volt_uv, soc_data->cfg[i].name, ret);
> + return ret;
> + }
> +
> + rinfo->regulator_nb.notifier_call =
> + tegra_io_pads_rail_change_notify_cb;
> + ret = devm_regulator_register_notifier(rinfo->regulator,
> + &rinfo->regulator_nb);
> + if (ret < 0) {
> + dev_err(dev, "Failed to register regulator %s notifier: %d\n",
> + soc_data->cfg[i].name, ret);
> + return ret;
> + }
> + }
> +
> + tegra_io_pads_pinctrl_desc.pins = tiopi->soc_data->desc;
> + tegra_io_pads_pinctrl_desc.npins = tiopi->soc_data->num_desc;

This modifies global data. Can we avoid that? I think the easiest would
be to make tegra_io_pads_pinctrl_desc a field of the tegra_io_pads_info
struct.

> + platform_set_drvdata(pdev, tiopi);
> +
> + tiopi->pctl = devm_pinctrl_register(dev, &tegra_io_pads_pinctrl_desc,
> + tiopi);
> + if (IS_ERR(tiopi->pctl)) {
> + ret = PTR_ERR(tiopi->pctl);
> + dev_err(dev, "Failed to register io-pad pinctrl driver: %d\n",
> + ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +#define TEGRA124_PAD_INFO_TABLE(_entry_) \
> + _entry_(0, "audio", AUDIO, true, NULL), \
> + _entry_(1, "bb", BB, true, NULL), \
> + _entry_(2, "cam", CAM, true, NULL), \
> + _entry_(3, "comp", COMP, true, NULL), \
> + _entry_(4, "csia", CSIA, true, NULL), \
> + _entry_(5, "csib", CSIB, true, NULL), \
> + _entry_(6, "csie", CSIE, true, NULL), \
> + _entry_(7, "dsi", DSI, true, NULL), \
> + _entry_(8, "dsib", DSIB, true, NULL), \
> + _entry_(9, "dsic", DSIC, true, NULL), \
> + _entry_(10, "dsid", DSID, true, NULL), \
> + _entry_(11, "hdmi", HDMI, true, NULL), \
> + _entry_(12, "hsic", HSIC, true, NULL), \
> + _entry_(13, "hv", HV, true, NULL), \
> + _entry_(14, "lvds", LVDS, true, NULL), \
> + _entry_(15, "mipi-bias", MIPI_BIAS, true, NULL), \
> + _entry_(16, "nand", NAND, true, NULL), \
> + _entry_(17, "pex-bias", PEX_BIAS, true, NULL), \
> + _entry_(18, "pex-clk1", PEX_CLK1, true, NULL), \
> + _entry_(19, "pex-clk2", PEX_CLK2, true, NULL), \
> + _entry_(20, "pex-ctrl", PEX_CNTRL, true, NULL), \
> + _entry_(21, "sdmmc1", SDMMC1, true, NULL), \
> + _entry_(22, "sdmmc3", SDMMC3, true, NULL), \
> + _entry_(23, "sdmmc4", SDMMC4, true, NULL), \
> + _entry_(24, "sys-ddc", SYS_DDC, true, NULL), \
> + _entry_(25, "uart", UART, true, NULL), \
> + _entry_(26, "usb0", USB0, true, NULL), \
> + _entry_(27, "usb1", USB1, true, NULL), \
> + _entry_(28, "usb2", USB2, true, NULL), \
> + _entry_(29, "usb-bias", USB_BIAS, true, NULL)
> +
> +#define TEGRA210_PAD_INFO_TABLE(_entry_) \
> + _entry_(0, "audio", AUDIO, true, "vddio-audio"), \
> + _entry_(1, "audio-hv", AUDIO_HV, true, "vddio-audio-hv"), \
> + _entry_(2, "cam", CAM, true, "vddio-cam"), \
> + _entry_(3, "csia", CSIA, true, NULL), \
> + _entry_(4, "csib", CSIB, true, NULL), \
> + _entry_(5, "csic", CSIC, true, NULL), \
> + _entry_(6, "csid", CSID, true, NULL), \
> + _entry_(7, "csie", CSIE, true, NULL), \
> + _entry_(8, "csif", CSIF, true, NULL), \
> + _entry_(9, "dbg", DBG, true, "vddio-dbg"), \
> + _entry_(10, "debug-nonao", DEBUG_NONAO, true, NULL), \
> + _entry_(11, "dmic", DMIC, true, "vddio-dmic"), \
> + _entry_(12, "dp", DP, true, NULL), \
> + _entry_(13, "dsi", DSI, true, NULL), \
> + _entry_(14, "dsib", DSIB, true, NULL), \
> + _entry_(15, "dsic", DSIC, true, NULL), \
> + _entry_(16, "dsid", DSID, true, NULL), \
> + _entry_(17, "emmc", SDMMC4, true, NULL), \
> + _entry_(18, "emmc2", EMMC2, true, NULL), \
> + _entry_(19, "gpio", GPIO, true, "vddio-gpio"), \
> + _entry_(20, "hdmi", HDMI, true, NULL), \
> + _entry_(21, "hsic", HSIC, true, NULL), \
> + _entry_(22, "lvds", LVDS, true, NULL), \
> + _entry_(23, "mipi-bias", MIPI_BIAS, true, NULL), \
> + _entry_(24, "pex-bias", PEX_BIAS, true, NULL), \
> + _entry_(25, "pex-clk1", PEX_CLK1, true, NULL), \
> + _entry_(26, "pex-clk2", PEX_CLK2, true, NULL), \
> + _entry_(27, "pex-ctrl", PEX_CNTRL, false, "vddio-pex-ctrl"), \
> + _entry_(28, "sdmmc1", SDMMC1, true, "vddio-sdmmc1"), \
> + _entry_(29, "sdmmc3", SDMMC3, true, "vddio-sdmmc3"), \
> + _entry_(30, "spi", SPI, true, "vddio-spi"), \
> + _entry_(31, "spi-hv", SPI_HV, true, "vddio-spi-hv"), \
> + _entry_(32, "uart", UART, true, "vddio-uart"), \
> + _entry_(33, "usb0", USB0, true, NULL), \
> + _entry_(34, "usb1", USB1, true, NULL), \
> + _entry_(35, "usb2", USB2, true, NULL), \
> + _entry_(36, "usb3", USB3, true, NULL), \
> + _entry_(37, "usb-bias", USB_BIAS, true, NULL)
> +
> +#define TEGRA_IO_PAD_INFO(_pin, _name, _id, _lpstate, _vsupply) \
> + { \
> + .name = _name, \
> + .pins = {(_pin)}, \
> + .id = TEGRA_IO_PAD_##_id, \
> + .vsupply = (_vsupply), \
> + .supports_low_power = (_lpstate), \
> + }
> +
> +static const struct tegra_io_pads_cfg tegra124_io_pads_cfg_info[] = {
> + TEGRA124_PAD_INFO_TABLE(TEGRA_IO_PAD_INFO),
> +};
> +
> +static const struct tegra_io_pads_cfg tegra210_io_pads_cfg_info[] = {
> + TEGRA210_PAD_INFO_TABLE(TEGRA_IO_PAD_INFO),
> +};

That's a weird way of writing these tables. Why not do something simpler
and much more common such as:

#define TEGRA_IO_PAD_INFO(...) ...

static const struct tegra_io_pads_cfg tegra124_io_pads_cfgs[] = {
TEGRA_IO_PAD_INFO(...),
...
};

static const struct tegra_io_pads_cfg tegra210_io_pad_cfgs[] = {
TEGRA_IO_PAD_INFO(...),
...
};

> +
> +#define TEGRA_IO_PAD_DESC(_pin, _name, _id, _lpstate, _vsupply) \
> + PINCTRL_PIN(_pin, _name)
> +
> +static const struct pinctrl_pin_desc tegra124_io_pads_pinctrl_desc[] = {
> + TEGRA124_PAD_INFO_TABLE(TEGRA_IO_PAD_DESC),
> +};
> +
> +static const struct pinctrl_pin_desc tegra210_io_pads_pinctrl_desc[] = {
> + TEGRA210_PAD_INFO_TABLE(TEGRA_IO_PAD_DESC),
> +};
> +
> +static const struct tegra_io_pads_soc_data tegra124_io_pad_soc_data = {
> + .desc = tegra124_io_pads_pinctrl_desc,
> + .num_desc = ARRAY_SIZE(tegra124_io_pads_pinctrl_desc),
> + .cfg = tegra124_io_pads_cfg_info,
> + .num_cfg = ARRAY_SIZE(tegra124_io_pads_cfg_info),
> +};
> +
> +static const struct tegra_io_pads_soc_data tegra210_io_pad_soc_data = {
> + .desc = tegra210_io_pads_pinctrl_desc,
> + .num_desc = ARRAY_SIZE(tegra210_io_pads_pinctrl_desc),
> + .cfg = tegra210_io_pads_cfg_info,
> + .num_cfg = ARRAY_SIZE(tegra210_io_pads_cfg_info),
> +};
> +
> +static const struct platform_device_id tegra_io_pads_dev_id[] = {
> + {
> + .name = "pinctrl-t124-io-pad",
> + .driver_data = (kernel_ulong_t)&tegra124_io_pad_soc_data,
> + }, {
> + .name = "pinctrl-t210-io-pad",
> + .driver_data = (kernel_ulong_t)&tegra210_io_pad_soc_data,
> + }, {
> + },
> +};
> +MODULE_DEVICE_TABLE(platform, tegra_io_pads_dev_id);
> +
> +static struct platform_driver tegra_io_pads_pinctrl_driver = {
> + .driver = {
> + .name = "pinctrl-tegra-io-pad",
> + },
> + .probe = tegra_io_pads_pinctrl_probe,
> + .id_table = tegra_io_pads_dev_id,
> +};
> +
> +module_platform_driver(tegra_io_pads_pinctrl_driver);
> +
> +MODULE_DESCRIPTION("NVIDIA TEGRA IO pad Control Driver");
> +MODULE_AUTHOR("Laxman Dewangan <[email protected]>");
> +MODULE_LICENSE("GPL v2");

Like I said above, I think there's a lot of boilerplate in here that's
simply there to create a virtual device and bind a driver to it. All of
that comes with very little to no benefit. I think this could all just
be moved into the PMC driver and be simplified quite a bit.

Thierry

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2016-11-25 10:27:23

Hi Laxman,

[auto build test ERROR on tegra/for-next]
[also build test ERROR on v4.9-rc7 next-20161202]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/Laxman-Dewangan/pinctrl-tegra-Add-DT-binding-for-io-pads-control/20161124-185652
base: https://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux.git for-next
config: arm-allmodconfig (attached as .config)
compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=arm

All errors (new ones prefixed by >>):

drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c: In function 'tegra_io_pads_pinconf_get':
>> drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c:124:9: error: implicit declaration of function 'tegra_io_pad_power_get_status' [-Werror=implicit-function-declaration]
ret = tegra_io_pad_power_get_status(cfg->id);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: some warnings being treated as errors

vim +/tegra_io_pad_power_get_status +124 drivers/pinctrl/tegra/pinctrl-tegra-io-pad.c

118 dev_err(tiopi->dev,
119 "IO pad %s does not support low power\n",
120 cfg->name);
121 return -EINVAL;
122 }
123
> 124 ret = tegra_io_pad_power_get_status(cfg->id);
125 if (ret < 0)
126 return ret;
127 arg = !ret;

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation

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