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authorThomas Abraham <thomas.abraham@linaro.org>2012-11-27 14:04:32 +0530
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-11-27 20:05:36 +0000
commit77b71b370ed06c75bdebef09be438d5275f70fc1 (patch)
tree7a5408e5f954d460712bc0b80f2bfc831bdfa346 /drivers/regulator
parent068a8c8239d50a5fd025c97f94945d9f2ffa3438 (diff)
downloadop-kernel-dev-77b71b370ed06c75bdebef09be438d5275f70fc1.zip
op-kernel-dev-77b71b370ed06c75bdebef09be438d5275f70fc1.tar.gz
regulator: add device tree support for max8997
Add device tree based discovery support for max8997. Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com> Reviewed-by: Tomasz Figa <t.figa@samsung.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/max8997.c148
1 files changed, 146 insertions, 2 deletions
diff --git a/drivers/regulator/max8997.c b/drivers/regulator/max8997.c
index 64cf2ee..b56c432 100644
--- a/drivers/regulator/max8997.c
+++ b/drivers/regulator/max8997.c
@@ -24,6 +24,7 @@
#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>
@@ -31,6 +32,7 @@
#include <linux/regulator/machine.h>
#include <linux/mfd/max8997.h>
#include <linux/mfd/max8997-private.h>
+#include <linux/regulator/of_regulator.h>
struct max8997_data {
struct device *dev;
@@ -933,10 +935,145 @@ static struct regulator_desc regulators[] = {
max8997_charger_fixedstate_ops),
};
+#ifdef CONFIG_OF
+static int max8997_pmic_dt_parse_dvs_gpio(struct max8997_dev *iodev,
+ struct max8997_platform_data *pdata,
+ struct device_node *pmic_np)
+{
+ int i, gpio;
+
+ for (i = 0; i < 3; i++) {
+ gpio = of_get_named_gpio(pmic_np,
+ "max8997,pmic-buck125-dvs-gpios", i);
+ if (!gpio_is_valid(gpio)) {
+ dev_err(iodev->dev, "invalid gpio[%d]: %d\n", i, gpio);
+ return -EINVAL;
+ }
+ pdata->buck125_gpios[i] = gpio;
+ }
+ return 0;
+}
+
+static int max8997_pmic_dt_parse_pdata(struct max8997_dev *iodev,
+ struct max8997_platform_data *pdata)
+{
+ struct device_node *pmic_np, *regulators_np, *reg_np;
+ struct max8997_regulator_data *rdata;
+ 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;
+ }
+
+ pdata->regulators = rdata;
+ 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++;
+ }
+
+ if (of_get_property(pmic_np, "max8997,pmic-buck1-uses-gpio-dvs", NULL))
+ pdata->buck1_gpiodvs = true;
+
+ if (of_get_property(pmic_np, "max8997,pmic-buck2-uses-gpio-dvs", NULL))
+ pdata->buck2_gpiodvs = true;
+
+ if (of_get_property(pmic_np, "max8997,pmic-buck5-uses-gpio-dvs", NULL))
+ pdata->buck5_gpiodvs = true;
+
+ if (pdata->buck1_gpiodvs || pdata->buck2_gpiodvs ||
+ pdata->buck5_gpiodvs) {
+ ret = max8997_pmic_dt_parse_dvs_gpio(iodev, pdata, pmic_np);
+ if (ret)
+ return -EINVAL;
+
+ if (of_property_read_u32(pmic_np,
+ "max8997,pmic-buck125-default-dvs-idx",
+ &pdata->buck125_default_idx)) {
+ pdata->buck125_default_idx = 0;
+ } else {
+ if (pdata->buck125_default_idx >= 8) {
+ pdata->buck125_default_idx = 0;
+ dev_info(iodev->dev, "invalid value for "
+ "default dvs index, using 0 instead\n");
+ }
+ }
+
+ if (of_get_property(pmic_np,
+ "max8997,pmic-ignore-gpiodvs-side-effect", NULL))
+ pdata->ignore_gpiodvs_side_effect = true;
+
+ dvs_voltage_nr = 8;
+ }
+
+ if (of_property_read_u32_array(pmic_np,
+ "max8997,pmic-buck1-dvs-voltage",
+ pdata->buck1_voltage, dvs_voltage_nr)) {
+ dev_err(iodev->dev, "buck1 voltages not specified\n");
+ return -EINVAL;
+ }
+
+ if (of_property_read_u32_array(pmic_np,
+ "max8997,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,
+ "max8997,pmic-buck5-dvs-voltage",
+ pdata->buck5_voltage, dvs_voltage_nr)) {
+ dev_err(iodev->dev, "buck5 voltages not specified\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+#else
+static int max8997_pmic_dt_parse_pdata(struct max8997_dev *iodev,
+ struct max8997_platform_data *pdata)
+{
+ return 0;
+}
+#endif /* CONFIG_OF */
+
static __devinit int max8997_pmic_probe(struct platform_device *pdev)
{
struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
- struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
+ struct max8997_platform_data *pdata = iodev->pdata;
struct regulator_config config = { };
struct regulator_dev **rdev;
struct max8997_data *max8997;
@@ -944,11 +1081,17 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
int i, ret, size, nr_dvs;
u8 max_buck1 = 0, max_buck2 = 0, max_buck5 = 0;
- if (!pdata) {
+ if (IS_ERR_OR_NULL(pdata)) {
dev_err(pdev->dev.parent, "No platform init data supplied.\n");
return -ENODEV;
}
+ if (iodev->dev->of_node) {
+ ret = max8997_pmic_dt_parse_pdata(iodev, pdata);
+ if (ret)
+ return ret;
+ }
+
max8997 = devm_kzalloc(&pdev->dev, sizeof(struct max8997_data),
GFP_KERNEL);
if (!max8997)
@@ -1104,6 +1247,7 @@ static __devinit int max8997_pmic_probe(struct platform_device *pdev)
config.dev = max8997->dev;
config.init_data = pdata->regulators[i].initdata;
config.driver_data = max8997;
+ config.of_node = pdata->regulators[i].reg_node;
rdev[i] = regulator_register(&regulators[id], &config);
if (IS_ERR(rdev[i])) {
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