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Message-ID: <CAPdUM4PzaSdKHUEE_XUOu9bKV2rzqL5XTKR2_QS=eT28vmnmCw@mail.gmail.com>
Date: Thu, 31 Jan 2013 15:26:25 +0530
From: Rahul Sharma <r.sh.open@...il.com>
To: Amit Daniel Kachhap <amit.daniel@...sung.com>
Cc: linux-kernel@...r.kernel.org, Sangbeom Kim <sbkim73@...sung.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
amit.kachhap@...il.com, Thomas Abraham <thomas.abraham@...aro.org>,
linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH V2] regulator: add device tree support for s5m8767
On Thu, Jan 31, 2013 at 3:10 AM, Amit Daniel Kachhap
<amit.daniel@...sung.com> wrote:
> This device tree support is added for PMIC block of S5m8767 multi
> function driver. The usage detail is added in the device tree
> documentation section. This change is tested on exynos5250 based
> arndale platform by regulator voltage set/get API's.
>
> Reviewed-by: Thomas Abraham <thomas.abraham@...aro.org>
> Signed-off-by: Amit Daniel Kachhap <amit.daniel@...sung.com>
> ---
> Change since V1:
> * Added description of pmic-buck-ds-gpios and op_mode in the device tree
> documentation as suggested by Thomas Abraham.
> * Incorporated coding guidelines review comments.
>
> This patch is based on Mark Brown's tree next branch.
> git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator.git
>
> .../bindings/regulator/s5m8767-regulator.txt | 152 ++++++++++++++++
> drivers/mfd/sec-core.c | 75 ++++++++-
> drivers/regulator/s5m8767.c | 188 +++++++++++++++++++-
> include/linux/mfd/samsung/core.h | 11 +-
> 4 files changed, 419 insertions(+), 7 deletions(-)
> create mode 100644 Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
>
> diff --git a/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt b/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
> new file mode 100644
> index 0000000..a35ff99
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/s5m8767-regulator.txt
> @@ -0,0 +1,152 @@
> +* Samsung S5M8767 Voltage and Current Regulator
> +
> +The Samsung S5M8767 is a multi-function device which includes volatage and
> +current regulators, rtc, charger controller and other sub-blocks. It is
> +interfaced to the host controller using a i2c interface. Each sub-block is
> +addressed by the host system using different i2c slave address. This document
> +describes the bindings for 'pmic' sub-block of s5m8767.
> +
> +Required properties:
> +- compatible: Should be "samsung,s5m8767-pmic".
> +- reg: Specifies the i2c slave address of the pmic block. It should be 0x66.
> +
> +- s5m8767,pmic-buck2-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
> + units for buck2 when changing voltage using gpio dvs. Refer to [1] below
> + for additional information.
> +
> +- s5m8767,pmic-buck3-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
> + units for buck3 when changing voltage using gpio dvs. Refer to [1] below
> + for additional information.
> +
> +- s5m8767,pmic-buck4-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
> + units for buck4 when changing voltage using gpio dvs. Refer to [1] below
> + for additional information.
> +
> +- s5m8767,pmic-buck-ds-gpios: GPIO specifiers for three host gpio's used
> + for selecting GPIO DVS lines. It is one-to-one mapped to dvs gpio lines.
> +
> +[1] If none of the 's5m8767,pmic-buck[2/3/4]-uses-gpio-dvs' optional
> + property is specified, the 's5m8767,pmic-buck[2/3/4]-dvs-voltage'
> + property should specify atleast one voltage level (which would be a
> + safe operating voltage).
> +
> + If either of the 's5m8767,pmic-buck[2/3/4]-uses-gpio-dvs' optional
> + property is specified, then all the eight voltage values for the
> + 's5m8767,pmic-buck[2/3/4]-dvs-voltage' should be specified.
> +
> +Optional properties:
> +- interrupt-parent: Specifies the phandle of the interrupt controller to which
> + the interrupts from s5m8767 are delivered to.
> +- interrupts: Interrupt specifiers for two interrupt sources.
> + - First interrupt specifier is for 'irq1' interrupt.
> + - Second interrupt specifier is for 'alert' interrupt.
> +- s5m8767,pmic-buck2-uses-gpio-dvs: 'buck2' can be controlled by gpio dvs.
> +- s5m8767,pmic-buck3-uses-gpio-dvs: 'buck3' can be controlled by gpio dvs.
> +- s5m8767,pmic-buck4-uses-gpio-dvs: 'buck4' can be controlled by gpio dvs.
> +
> +Additional properties required if either of the optional properties are used:
> +
> +- s5m8767,pmic-buck234-default-dvs-idx: Default voltage setting selected from
> + the possible 8 options selectable by the dvs gpios. The value of this
> + property should be between 0 and 7. If not specified or if out of range, the
> + default value of this property is set to 0.
> +
> +- s5m8767,pmic-buck-dvs-gpios: GPIO specifiers for three host gpio's used
> + for dvs. The format of the gpio specifier depends in the gpio controller.
> +
> +Regulators: The regulators of s5m8767 that have to be instantiated should be
> +included in a sub-node named 'regulators'. Regulator nodes included in this
> +sub-node should be of the format as listed below.
> +
> + regulator_name {
> + ldo1_reg: LDO1 {
> + regulator-name = "VDD_ALIVE_1.0V";
> + regulator-min-microvolt = <1100000>;
> + regulator-max-microvolt = <1100000>;
> + regulator-always-on;
> + regulator-boot-on;
> + op_mode = <1>; /* Normal Mode */
> + };
> + };
> +The above regulator entries are defined in regulator bindings documentation
> +except op_mode description.
> + - op_mode: describes the different operating modes of the LDO's with
> + power mode change in SOC. The different possible values are,
> + 0 - always off mode
> + 1 - on in normal mode
> + 2 - low power mode
> + 3 - suspend mode
> +
> +The following are the names of the regulators that the s5m8767 pmic block
> +supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number
> +as per the datasheet of s5m8767.
> +
> + - LDOn
> + - valid values for n are 1 to 28
> + - Example: LDO0, LD01, LDO28
> + - BUCKn
> + - valid values for n are 1 to 9.
> + - Example: BUCK1, BUCK2, BUCK9
> +
> +The bindings inside the regulator nodes use the standard regulator bindings
> +which are documented elsewhere.
> +
> +Example:
> +
> + s5m8767_pmic@66 {
> + compatible = "samsung,s5m8767-pmic";
> + reg = <0x66>;
> +
> + s5m8767,pmic-buck2-uses-gpio-dvs;
> + s5m8767,pmic-buck3-uses-gpio-dvs;
> + s5m8767,pmic-buck4-uses-gpio-dvs;
> +
> + s5m8767,pmic-buck-default-dvs-idx = <0>;
> +
> + s5m8767,pmic-buck-dvs-gpios = <&gpx0 0 1 0 0>, /* DVS1 */
> + <&gpx0 1 1 0 0>, /* DVS2 */
> + <&gpx0 2 1 0 0>; /* DVS3 */
> +
> + s5m8767,pmic-buck-ds-gpios = <&gpx2 3 1 0 0>, /* SET1 */
> + <&gpx2 4 1 0 0>, /* SET2 */
> + <&gpx2 5 1 0 0>; /* SET3 */
> +
> + s5m8767,pmic-buck2-dvs-voltage = <1350000>, <1300000>,
> + <1250000>, <1200000>,
> + <1150000>, <1100000>,
> + <1000000>, <950000>;
> +
> + s5m8767,pmic-buck3-dvs-voltage = <1100000>, <1100000>,
> + <1100000>, <1100000>,
> + <1000000>, <1000000>,
> + <1000000>, <1000000>;
> +
> + s5m8767,pmic-buck4-dvs-voltage = <1200000>, <1200000>,
> + <1200000>, <1200000>,
> + <1200000>, <1200000>,
> + <1200000>, <1200000>;
> +
> + regulators {
> + ldo1_reg: LDO1 {
> + regulator-name = "VDD_ABB_3.3V";
> + regulator-min-microvolt = <3300000>;
> + regulator-max-microvolt = <3300000>;
> + op_mode = <1>; /* Normal Mode */
> + };
> +
> + ldo2_reg: LDO2 {
> + regulator-name = "VDD_ALIVE_1.1V";
> + regulator-min-microvolt = <1100000>;
> + regulator-max-microvolt = <1100000>;
> + regulator-always-on;
> + };
> +
> + buck1_reg: BUCK1 {
> + regulator-name = "VDD_MIF_1.2V";
> + regulator-min-microvolt = <950000>;
> + regulator-max-microvolt = <1350000>;
> + regulator-always-on;
> + regulator-boot-on;
> + };
> + };
> + };
> diff --git a/drivers/mfd/sec-core.c b/drivers/mfd/sec-core.c
> index 49d361a..453c326 100644
> --- a/drivers/mfd/sec-core.c
> +++ b/drivers/mfd/sec-core.c
> @@ -17,6 +17,7 @@
> #include <linux/err.h>
> #include <linux/slab.h>
> #include <linux/i2c.h>
> +#include <linux/of_irq.h>
> #include <linux/interrupt.h>
> #include <linux/pm_runtime.h>
> #include <linux/mutex.h>
> @@ -60,6 +61,15 @@ static struct mfd_cell s2mps11_devs[] = {
> },
> };
>
> +#ifdef CONFIG_OF
> +static struct of_device_id sec_dt_match[] = {
> + { .compatible = "samsung,s5m8767-pmic",
> + .data = (void *)S5M8767X,
> + },
> + {},
> +};
> +#endif
> +
> int sec_reg_read(struct sec_pmic_dev *sec_pmic, u8 reg, void *dest)
> {
> return regmap_read(sec_pmic->regmap, reg, dest);
> @@ -95,6 +105,57 @@ static struct regmap_config sec_regmap_config = {
> .val_bits = 8,
> };
>
> +
> +#ifdef CONFIG_OF
> +/*
> + * Only the common platform data elements for s5m8767 are parsed here from the
> + * device tree. Other sub-modules of s5m8767 such as pmic, rtc , charger and
> + * others have to parse their own platform data elements from device tree.
> + *
> + * The s5m8767 platform data structure is instantiated here and the drivers for
> + * the sub-modules need not instantiate another instance while parsing their
> + * platform data.
> + */
> +static struct sec_platform_data *sec_pmic_i2c_parse_dt_pdata(
> + struct device *dev)
> +{
> + struct sec_platform_data *pd;
> +
> + pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
> + if (!pd) {
> + dev_err(dev, "could not allocate memory for pdata\n");
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + /*
> + * ToDo: the 'wakeup' member in the platform data is more of a linux
> + * specfic information. Hence, there is no binding for that yet and
> + * not parsed here.
> + */
> +
> + return pd;
> +}
> +#else
> +static struct sec_platform_data *sec_i2c_parse_dt_pdata(
> + struct device *dev)
> +{
> + return 0;
> +}
> +#endif
> +
> +static inline int sec_i2c_get_driver_data(struct i2c_client *i2c,
> + const struct i2c_device_id *id)
> +{
> +#ifdef CONFIG_OF
> + if (i2c->dev.of_node) {
> + const struct of_device_id *match;
> + match = of_match_node(sec_dt_match, i2c->dev.of_node);
> + return (int)match->data;
> + }
> +#endif
> + return (int)id->driver_data;
> +}
> +
> static int sec_pmic_probe(struct i2c_client *i2c,
> const struct i2c_device_id *id)
> {
> @@ -111,13 +172,22 @@ static int sec_pmic_probe(struct i2c_client *i2c,
> sec_pmic->dev = &i2c->dev;
> sec_pmic->i2c = i2c;
> sec_pmic->irq = i2c->irq;
> - sec_pmic->type = id->driver_data;
> -
> + sec_pmic->type = sec_i2c_get_driver_data(i2c, id);
> +
> + if (sec_pmic->dev->of_node) {
> + pdata = sec_pmic_i2c_parse_dt_pdata(sec_pmic->dev);
> + if (IS_ERR(pdata)) {
> + ret = PTR_ERR(pdata);
> + return ret;
> + }
> + pdata->device_type = sec_pmic->type;
> + }
> if (pdata) {
> sec_pmic->device_type = pdata->device_type;
> sec_pmic->ono = pdata->ono;
> sec_pmic->irq_base = pdata->irq_base;
> sec_pmic->wakeup = pdata->wakeup;
> + sec_pmic->pdata = pdata;
> }
>
> sec_pmic->regmap = devm_regmap_init_i2c(i2c, &sec_regmap_config);
> @@ -192,6 +262,7 @@ static struct i2c_driver sec_pmic_driver = {
> .driver = {
> .name = "sec_pmic",
> .owner = THIS_MODULE,
> + .of_match_table = of_match_ptr(sec_dt_match),
> },
> .probe = sec_pmic_probe,
> .remove = sec_pmic_remove,
> diff --git a/drivers/regulator/s5m8767.c b/drivers/regulator/s5m8767.c
> index aa0ccef..3dfe820 100644
> --- a/drivers/regulator/s5m8767.c
> +++ b/drivers/regulator/s5m8767.c
> @@ -14,6 +14,7 @@
> #include <linux/bug.h>
> #include <linux/err.h>
> #include <linux/gpio.h>
> +#include <linux/of_gpio.h>
> #include <linux/slab.h>
> #include <linux/module.h>
> #include <linux/platform_device.h>
> @@ -21,6 +22,11 @@
> #include <linux/regulator/machine.h>
> #include <linux/mfd/samsung/core.h>
> #include <linux/mfd/samsung/s5m8767.h>
> +#include <linux/regulator/of_regulator.h>
> +#include <linux/io.h>
> +#include <mach/map.h>
"mach/map.h" will cause build break for ARCH_MULTIPLATFORM.
regards,
Rahul Sharma.
> +
> +#define S5M8767_OPMODE_NORMAL_MODE 0x1
>
> struct s5m8767_info {
> struct device *dev;
> @@ -474,15 +480,194 @@ static struct regulator_desc regulators[] = {
> s5m8767_regulator_desc(BUCK9),
> };
>
> +#ifdef CONFIG_OF
> +static int s5m8767_pmic_dt_parse_dvs_gpio(struct sec_pmic_dev *iodev,
> + struct sec_platform_data *pdata,
> + struct device_node *pmic_np)
> +{
> + int i, gpio;
> +
> + for (i = 0; i < 3; i++) {
> + gpio = of_get_named_gpio(pmic_np,
> + "s5m8767,pmic-buck-dvs-gpios", i);
> + if (!gpio_is_valid(gpio)) {
> + dev_err(iodev->dev, "invalid gpio[%d]: %d\n", i, gpio);
> + return -EINVAL;
> + }
> + pdata->buck_gpios[i] = gpio;
> + }
> + return 0;
> +}
> +
> +static int s5m8767_pmic_dt_parse_ds_gpio(struct sec_pmic_dev *iodev,
> + struct sec_platform_data *pdata,
> + struct device_node *pmic_np)
> +{
> + int i, gpio;
> +
> + for (i = 0; i < 3; i++) {
> + gpio = of_get_named_gpio(pmic_np,
> + "s5m8767,pmic-buck-ds-gpios", i);
> + if (!gpio_is_valid(gpio)) {
> + dev_err(iodev->dev, "invalid gpio[%d]: %d\n", i, gpio);
> + return -EINVAL;
> + }
> + pdata->buck_ds[i] = gpio;
> + }
> + return 0;
> +}
> +
> +static int s5m8767_pmic_dt_parse_pdata(struct sec_pmic_dev *iodev,
> + struct sec_platform_data *pdata)
> +{
> + struct device_node *pmic_np, *regulators_np, *reg_np;
> + struct sec_regulator_data *rdata;
> + struct sec_opmode_data *rmode;
> + unsigned int i, dvs_voltage_nr = 1, ret;
> +
> + pmic_np = iodev->dev->of_node;
> + if (!pmic_np) {
> + dev_err(iodev->dev, "could not find pmic sub-node\n");
> + return -ENODEV;
> + }
> +
> + regulators_np = of_find_node_by_name(pmic_np, "regulators");
> + if (!regulators_np) {
> + dev_err(iodev->dev, "could not find regulators sub-node\n");
> + return -EINVAL;
> + }
> +
> + /* count the number of regulators to be supported in pmic */
> + pdata->num_regulators = 0;
> + for_each_child_of_node(regulators_np, reg_np)
> + pdata->num_regulators++;
> +
> + rdata = devm_kzalloc(iodev->dev, sizeof(*rdata) *
> + pdata->num_regulators, GFP_KERNEL);
> + if (!rdata) {
> + dev_err(iodev->dev,
> + "could not allocate memory for regulator data\n");
> + return -ENOMEM;
> + }
> +
> + rmode = devm_kzalloc(iodev->dev, sizeof(*rmode) *
> + pdata->num_regulators, GFP_KERNEL);
> + if (!rdata) {
> + dev_err(iodev->dev,
> + "could not allocate memory for regulator mode\n");
> + return -ENOMEM;
> + }
> +
> + pdata->regulators = rdata;
> + pdata->opmode = rmode;
> + for_each_child_of_node(regulators_np, reg_np) {
> + for (i = 0; i < ARRAY_SIZE(regulators); i++)
> + if (!of_node_cmp(reg_np->name, regulators[i].name))
> + break;
> +
> + if (i == ARRAY_SIZE(regulators)) {
> + dev_warn(iodev->dev,
> + "don't know how to configure regulator %s\n",
> + reg_np->name);
> + continue;
> + }
> +
> + rdata->id = i;
> + rdata->initdata = of_get_regulator_init_data(
> + iodev->dev, reg_np);
> + rdata->reg_node = reg_np;
> + rdata++;
> + rmode->id = i;
> + if (of_property_read_u32(reg_np, "op_mode",
> + &rmode->mode)) {
> + dev_warn(iodev->dev,
> + "no op_mode property property at %s\n",
> + reg_np->full_name);
> +
> + rmode->mode = S5M8767_OPMODE_NORMAL_MODE;
> + }
> + rmode++;
> + }
> +
> + if (of_get_property(pmic_np, "s5m8767,pmic-buck2-uses-gpio-dvs", NULL))
> + pdata->buck2_gpiodvs = true;
> +
> + if (of_get_property(pmic_np, "s5m8767,pmic-buck3-uses-gpio-dvs", NULL))
> + pdata->buck3_gpiodvs = true;
> +
> + if (of_get_property(pmic_np, "s5m8767,pmic-buck4-uses-gpio-dvs", NULL))
> + pdata->buck4_gpiodvs = true;
> +
> + if (pdata->buck2_gpiodvs || pdata->buck3_gpiodvs ||
> + pdata->buck4_gpiodvs) {
> + ret = s5m8767_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
> + if (ret)
> + return -EINVAL;
> +
> + if (of_property_read_u32(pmic_np,
> + "s5m8767,pmic-buck-default-dvs-idx",
> + &pdata->buck_default_idx)) {
> + pdata->buck_default_idx = 0;
> + } else {
> + if (pdata->buck_default_idx >= 8) {
> + pdata->buck_default_idx = 0;
> + dev_info(iodev->dev,
> + "invalid value for default dvs index, use 0\n");
> + }
> + }
> + dvs_voltage_nr = 8;
> + }
> +
> + ret = s5m8767_pmic_dt_parse_ds_gpio(iodev, pdata, pmic_np);
> + if (ret)
> + return -EINVAL;
> +
> + if (of_property_read_u32_array(pmic_np,
> + "s5m8767,pmic-buck2-dvs-voltage",
> + pdata->buck2_voltage, dvs_voltage_nr)) {
> + dev_err(iodev->dev, "buck2 voltages not specified\n");
> + return -EINVAL;
> + }
> +
> + if (of_property_read_u32_array(pmic_np,
> + "s5m8767,pmic-buck3-dvs-voltage",
> + pdata->buck3_voltage, dvs_voltage_nr)) {
> + dev_err(iodev->dev, "buck3 voltages not specified\n");
> + return -EINVAL;
> + }
> +
> + if (of_property_read_u32_array(pmic_np,
> + "s5m8767,pmic-buck4-dvs-voltage",
> + pdata->buck4_voltage, dvs_voltage_nr)) {
> + dev_err(iodev->dev, "buck4 voltages not specified\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +#else
> +static int s5m8767_pmic_dt_parse_pdata(struct sec_pmic_dev *iodev,
> + struct sec_platform_data *pdata)
> +{
> + return 0;
> +}
> +#endif /* CONFIG_OF */
> +
> static int s5m8767_pmic_probe(struct platform_device *pdev)
> {
> struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
> - struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
> + struct sec_platform_data *pdata = iodev->pdata;
> struct regulator_config config = { };
> struct regulator_dev **rdev;
> struct s5m8767_info *s5m8767;
> int i, ret, size, buck_init;
>
> + if (iodev->dev->of_node) {
> + ret = s5m8767_pmic_dt_parse_pdata(iodev, pdata);
> + if (ret)
> + return ret;
> + }
> +
> if (!pdata) {
> dev_err(pdev->dev.parent, "Platform data not supplied\n");
> return -ENODEV;
> @@ -726,6 +911,7 @@ static int s5m8767_pmic_probe(struct platform_device *pdev)
> config.init_data = pdata->regulators[i].initdata;
> config.driver_data = s5m8767;
> config.regmap = iodev->regmap;
> + config.of_node = pdata->regulators[i].reg_node;
>
> rdev[i] = regulator_register(®ulators[id], &config);
> if (IS_ERR(rdev[i])) {
> diff --git a/include/linux/mfd/samsung/core.h b/include/linux/mfd/samsung/core.h
> index b50c38f..f0f4de3 100644
> --- a/include/linux/mfd/samsung/core.h
> +++ b/include/linux/mfd/samsung/core.h
> @@ -26,6 +26,7 @@ enum sec_device_type {
> /**
> * struct sec_pmic_dev - s5m87xx master device for sub-drivers
> * @dev: master device of the chip (can be used to access platform data)
> + * @pdata: pointer to private data used to pass platform data to child
> * @i2c: i2c client private data for regulator
> * @rtc: i2c client private data for rtc
> * @iolock: mutex for serializing io access
> @@ -39,6 +40,7 @@ enum sec_device_type {
> */
> struct sec_pmic_dev {
> struct device *dev;
> + struct sec_platform_data *pdata;
> struct regmap *regmap;
> struct i2c_client *i2c;
> struct i2c_client *rtc;
> @@ -82,11 +84,11 @@ struct sec_platform_data {
>
> int buck_gpios[3];
> int buck_ds[3];
> - int buck2_voltage[8];
> + unsigned int buck2_voltage[8];
> bool buck2_gpiodvs;
> - int buck3_voltage[8];
> + unsigned int buck3_voltage[8];
> bool buck3_gpiodvs;
> - int buck4_voltage[8];
> + unsigned int buck4_voltage[8];
> bool buck4_gpiodvs;
>
> int buck_set1;
> @@ -127,6 +129,7 @@ struct sec_platform_data {
> struct sec_regulator_data {
> int id;
> struct regulator_init_data *initdata;
> + struct device_node *reg_node;
> };
>
> /*
> @@ -136,7 +139,7 @@ struct sec_regulator_data {
> */
> struct sec_opmode_data {
> int id;
> - int mode;
> + unsigned int mode;
> };
>
> /*
> --
> 1.7.5.4
>
> --
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