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regulator: max77686: Add device tree support. 

This patch device tree support for regulator driver. It uses the parent
(mfd's) DT node to parse the regulator data for max77686.

Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
hifive-unleashed-5.1
Yadwinder Singh Brar 2012-07-05 09:28:25 +05:30 committed by Mark Brown
parent 6c3b956b94
commit 4706fcab9b
1 changed files with 57 additions and 1 deletions
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58
drivers/regulator/max77686.c
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@ -31,6 +31,7 @@
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/max77686.h>
#include <linux/mfd/max77686-private.h>
@ -233,6 +234,50 @@ static struct regulator_desc regulators[] = {
regulator_desc_buck(9),
};
#ifdef CONFIG_OF
static int max77686_pmic_dt_parse_pdata(struct max77686_dev *iodev,
struct max77686_platform_data *pdata)
{
struct device_node *pmic_np, *regulators_np;
struct max77686_regulator_data *rdata;
struct of_regulator_match rmatch;
unsigned int i;
pmic_np = iodev->dev->of_node;
regulators_np = of_find_node_by_name(pmic_np, "voltage-regulators");
if (!regulators_np) {
dev_err(iodev->dev, "could not find regulators sub-node\n");
return -EINVAL;
}
pdata->num_regulators = ARRAY_SIZE(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;
}
for (i = 0; i < pdata->num_regulators; i++) {
rmatch.name = regulators[i].name;
rmatch.init_data = NULL;
of_regulator_match(iodev->dev, regulators_np, &rmatch, 1);
rdata[i].initdata = rmatch.init_data;
}
pdata->regulators = rdata;
return 0;
}
#else
static int max77686_pmic_dt_parse_pdata(struct max77686_dev *iodev,
struct max77686_platform_data *pdata)
{
return 0;
}
#endif /* CONFIG_OF */
static __devinit int max77686_pmic_probe(struct platform_device *pdev)
{
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
@ -245,7 +290,18 @@ static __devinit int max77686_pmic_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "%s\n", __func__);
if (!pdata || pdata->num_regulators != MAX77686_REGULATORS) {
if (!pdata) {
dev_err(&pdev->dev, "no platform data found for regulator\n");
return -ENODEV;
}
if (iodev->dev->of_node) {
ret = max77686_pmic_dt_parse_pdata(iodev, pdata);
if (ret)
return ret;
}
if (pdata->num_regulators != MAX77686_REGULATORS) {
dev_err(&pdev->dev,
"Invalid initial data for regulator's initialiation\n");
return -EINVAL;