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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2013-06-24 14:50:16 +0400
committerMark Brown <broonie@linaro.org>2013-06-24 18:22:26 +0400
commit42dc30231ba35939213c33378c17cb81c31b0a37 (patch)
treef908d61307859878cc5d2e926c10cf08da2e3c61 /drivers/regulator/max8973-regulator.c
parentdb892ff6c0f49708f13d9dff3957034f2f90e1c1 (diff)
downloadlinux-42dc30231ba35939213c33378c17cb81c31b0a37.tar.xz
regulator: max8973: initial DT support
This patch adds primitive DT support to the max8973 regulator driver. None of the configuration parameters, supported in the platform data are yet available in DT, therefore no configuration is performed if booting with no platform data. This means, that DT instantiation can only be used on boards, where no run-time configuration of the chip is required. In such cases the driver can be used to scale its output voltage. In the future support for configuration parameters should be added. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/regulator/max8973-regulator.c')
-rw-r--r--drivers/regulator/max8973-regulator.c37
1 files changed, 25 insertions, 12 deletions
diff --git a/drivers/regulator/max8973-regulator.c b/drivers/regulator/max8973-regulator.c
index b2dbdd70cab1..0c5195a842e2 100644
--- a/drivers/regulator/max8973-regulator.c
+++ b/drivers/regulator/max8973-regulator.c
@@ -26,10 +26,12 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
+#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/max8973-regulator.h>
+#include <linux/regulator/of_regulator.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/slab.h>
@@ -370,7 +372,8 @@ static int max8973_probe(struct i2c_client *client,
int ret;
pdata = client->dev.platform_data;
- if (!pdata) {
+
+ if (!pdata && !client->dev.of_node) {
dev_err(&client->dev, "No Platform data");
return -EIO;
}
@@ -400,7 +403,7 @@ static int max8973_probe(struct i2c_client *client,
max->desc.uV_step = MAX8973_VOLATGE_STEP;
max->desc.n_voltages = MAX8973_BUCK_N_VOLTAGE;
- if (!pdata->enable_ext_control) {
+ if (!pdata || !pdata->enable_ext_control) {
max->desc.enable_reg = MAX8973_VOUT;
max->desc.enable_mask = MAX8973_VOUT_ENABLE;
max->ops.enable = regulator_enable_regmap;
@@ -408,12 +411,17 @@ static int max8973_probe(struct i2c_client *client,
max->ops.is_enabled = regulator_is_enabled_regmap;
}
- max->enable_external_control = pdata->enable_ext_control;
- max->dvs_gpio = pdata->dvs_gpio;
- max->curr_gpio_val = pdata->dvs_def_state;
- max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;
+ if (pdata) {
+ max->dvs_gpio = pdata->dvs_gpio;
+ max->enable_external_control = pdata->enable_ext_control;
+ max->curr_gpio_val = pdata->dvs_def_state;
+ max->curr_vout_reg = MAX8973_VOUT + pdata->dvs_def_state;
+ } else {
+ max->dvs_gpio = -EINVAL;
+ max->curr_vout_reg = MAX8973_VOUT;
+ }
+
max->lru_index[0] = max->curr_vout_reg;
- max->valid_dvs_gpio = false;
if (gpio_is_valid(max->dvs_gpio)) {
int gpio_flags;
@@ -439,16 +447,21 @@ static int max8973_probe(struct i2c_client *client,
max->lru_index[i] = i;
max->lru_index[0] = max->curr_vout_reg;
max->lru_index[max->curr_vout_reg] = 0;
+ } else {
+ max->valid_dvs_gpio = false;
}
- ret = max8973_init_dcdc(max, pdata);
- if (ret < 0) {
- dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret);
- return ret;
+ if (pdata) {
+ ret = max8973_init_dcdc(max, pdata);
+ if (ret < 0) {
+ dev_err(max->dev, "Max8973 Init failed, err = %d\n", ret);
+ return ret;
+ }
}
config.dev = &client->dev;
- config.init_data = pdata->reg_init_data;
+ config.init_data = pdata ? pdata->reg_init_data :
+ of_get_regulator_init_data(&client->dev, client->dev.of_node);
config.driver_data = max;
config.of_node = client->dev.of_node;
config.regmap = max->regmap;