mfd: Add device tree support for max77686
This patch adds device tree support for mfd driver and adds Documentation/devicetree/bindings/mfd/max77686.txt. This patch also intialize max77686 pointer to NULL in max77686_i2c_probe to silent a compile time warning. Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com> Reviwed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Yadwinder Singh Brar
Samuel Ortiz
parent
2b40459b7e
commit
c1516f840d
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@ -0,0 +1,59 @@
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Maxim MAX77686 multi-function device
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MAX77686 is a Mulitifunction device with PMIC, RTC and Charger on chip. It is
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interfaced to host controller using i2c interface. PMIC and Charger submodules
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are addressed using same i2c slave address whereas RTC submodule uses
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different i2c slave address,presently for which we are statically creating i2c
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client while probing.This document describes the binding for mfd device and
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PMIC submodule.
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Required properties:
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- compatible : Must be "maxim,max77686";
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- reg : Specifies the i2c slave address of PMIC block.
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- interrupts : This i2c device has an IRQ line connected to the main SoC.
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- interrupt-parent : The parent interrupt controller.
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Optional node:
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- voltage-regulators : The regulators of max77686 have to be instantiated
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under subnode named "voltage-regulators" using the following format.
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regulator_name {
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regulator-compatible = LDOn/BUCKn
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standard regulator constraints....
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};
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refer Documentation/devicetree/bindings/regulator/regulator.txt
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The regulator-compatible property of regulator should initialized with string
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to get matched with their hardware counterparts as follow:
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-LDOn : for LDOs, where n can lie in range 1 to 26.
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example: LDO1, LDO2, LDO26.
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-BUCKn : for BUCKs, where n can lie in range 1 to 9.
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example: BUCK1, BUCK5, BUCK9.
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Example:
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max77686@09 {
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compatible = "maxim,max77686";
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interrupt-parent = <&wakeup_eint>;
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interrupts = <26 0>;
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reg = <0x09>;
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voltage-regulators {
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ldo11_reg {
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regulator-compatible = "LDO11";
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regulator-name = "vdd_ldo11";
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regulator-min-microvolt = <1900000>;
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regulator-max-microvolt = <1900000>;
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regulator-always-on;
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};
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buck1_reg {
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regulator-compatible = "BUCK1";
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regulator-name = "vdd_mif";
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regulator-min-microvolt = <950000>;
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regulator-max-microvolt = <1300000>;
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regulator-always-on;
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regulator-boot-on;
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};
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}
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@ -34,6 +34,11 @@
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#define I2C_ADDR_RTC (0x0C >> 1)
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static struct of_device_id __devinitdata max77686_pmic_dt_match[] = {
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{.compatible = "maxim,max77686", .data = 0},
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{},
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};
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static struct mfd_cell max77686_devs[] = {
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{ .name = "max77686-pmic", },
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{ .name = "max77686-rtc", },
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@ -44,14 +49,46 @@ static struct regmap_config max77686_regmap_config = {
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.val_bits = 8,
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};
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#ifdef CONFIG_OF
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static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
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*dev)
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{
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struct max77686_platform_data *pd;
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pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
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if (!pd) {
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dev_err(dev, "could not allocate memory for pdata\n");
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return NULL;
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}
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dev->platform_data = pd;
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return pd;
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}
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#else
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static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
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*dev)
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{
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return 0;
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}
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#endif
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static int max77686_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct max77686_dev *max77686;
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struct max77686_dev *max77686 = NULL;
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struct max77686_platform_data *pdata = i2c->dev.platform_data;
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unsigned int data;
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int ret = 0;
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if (i2c->dev.of_node)
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pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
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if (!pdata) {
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ret = -EIO;
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dev_err(&i2c->dev, "No platform data found.\n");
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goto err;
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}
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max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL);
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if (max77686 == NULL)
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return -ENOMEM;
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@ -70,11 +107,6 @@ static int max77686_i2c_probe(struct i2c_client *i2c,
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max77686->i2c = i2c;
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max77686->type = id->driver_data;
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if (!pdata) {
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ret = -EIO;
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goto err;
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}
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max77686->wakeup = pdata->wakeup;
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max77686->irq_gpio = pdata->irq_gpio;
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max77686->irq = i2c->irq;
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@ -130,6 +162,7 @@ static struct i2c_driver max77686_i2c_driver = {
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.driver = {
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.name = "max77686",
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.owner = THIS_MODULE,
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.of_match_table = of_match_ptr(max77686_pmic_dt_match),
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},
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.probe = max77686_i2c_probe,
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.remove = max77686_i2c_remove,
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