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mfd: Add device tree support for max77686

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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 2012-07-06 17:02:55 +05:30 committed by Samuel Ortiz
parent 2b40459b7e
commit c1516f840d
2 changed files with 98 additions and 6 deletions
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59
Documentation/devicetree/bindings/mfd/max77686.txt Normal file
View File

@ -0,0 +1,59 @@
Maxim MAX77686 multi-function device
MAX77686 is a Mulitifunction device with PMIC, RTC and Charger on chip. It is
interfaced to host controller using i2c interface. PMIC and Charger submodules
are addressed using same i2c slave address whereas RTC submodule uses
different i2c slave address,presently for which we are statically creating i2c
client while probing.This document describes the binding for mfd device and
PMIC submodule.
Required properties:
- compatible : Must be "maxim,max77686";
- reg : Specifies the i2c slave address of PMIC block.
- interrupts : This i2c device has an IRQ line connected to the main SoC.
- interrupt-parent : The parent interrupt controller.
Optional node:
- voltage-regulators : The regulators of max77686 have to be instantiated
under subnode named "voltage-regulators" using the following format.
regulator_name {
regulator-compatible = LDOn/BUCKn
standard regulator constraints....
};
refer Documentation/devicetree/bindings/regulator/regulator.txt
The regulator-compatible property of regulator should initialized with string
to get matched with their hardware counterparts as follow:
-LDOn : for LDOs, where n can lie in range 1 to 26.
example: LDO1, LDO2, LDO26.
-BUCKn : for BUCKs, where n can lie in range 1 to 9.
example: BUCK1, BUCK5, BUCK9.
Example:
max77686@09 {
compatible = "maxim,max77686";
interrupt-parent = <&wakeup_eint>;
interrupts = <26 0>;
reg = <0x09>;
voltage-regulators {
ldo11_reg {
regulator-compatible = "LDO11";
regulator-name = "vdd_ldo11";
regulator-min-microvolt = <1900000>;
regulator-max-microvolt = <1900000>;
regulator-always-on;
};
buck1_reg {
regulator-compatible = "BUCK1";
regulator-name = "vdd_mif";
regulator-min-microvolt = <950000>;
regulator-max-microvolt = <1300000>;
regulator-always-on;
regulator-boot-on;
};
}

45
drivers/mfd/max77686.c
View File

@ -34,6 +34,11 @@
#define I2C_ADDR_RTC (0x0C >> 1)
static struct of_device_id __devinitdata max77686_pmic_dt_match[] = {
{.compatible = "maxim,max77686", .data = 0},
{},
};
static struct mfd_cell max77686_devs[] = {
{ .name = "max77686-pmic", },
{ .name = "max77686-rtc", },
@ -44,14 +49,46 @@ static struct regmap_config max77686_regmap_config = {
.val_bits = 8,
};
#ifdef CONFIG_OF
static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
*dev)
{
struct max77686_platform_data *pd;
pd = devm_kzalloc(dev, sizeof(*pd), GFP_KERNEL);
if (!pd) {
dev_err(dev, "could not allocate memory for pdata\n");
return NULL;
}
dev->platform_data = pd;
return pd;
}
#else
static struct max77686_platform_data *max77686_i2c_parse_dt_pdata(struct device
*dev)
{
return 0;
}
#endif
static int max77686_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
struct max77686_dev *max77686;
struct max77686_dev *max77686 = NULL;
struct max77686_platform_data *pdata = i2c->dev.platform_data;
unsigned int data;
int ret = 0;
if (i2c->dev.of_node)
pdata = max77686_i2c_parse_dt_pdata(&i2c->dev);
if (!pdata) {
ret = -EIO;
dev_err(&i2c->dev, "No platform data found.\n");
goto err;
}
max77686 = kzalloc(sizeof(struct max77686_dev), GFP_KERNEL);
if (max77686 == NULL)
return -ENOMEM;
@ -70,11 +107,6 @@ static int max77686_i2c_probe(struct i2c_client *i2c,
max77686->i2c = i2c;
max77686->type = id->driver_data;
if (!pdata) {
ret = -EIO;
goto err;
}
max77686->wakeup = pdata->wakeup;
max77686->irq_gpio = pdata->irq_gpio;
max77686->irq = i2c->irq;
@ -130,6 +162,7 @@ static struct i2c_driver max77686_i2c_driver = {
.driver = {
.name = "max77686",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(max77686_pmic_dt_match),
},
.probe = max77686_i2c_probe,
.remove = max77686_i2c_remove,