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authorLaxman Dewangan <ldewangan@nvidia.com>2015-06-09 16:47:52 +0300
committerMark Brown <broonie@kernel.org>2015-06-09 20:09:10 +0300
commit3064c1f302d1b61dbb0e40e4ffc902edc6208517 (patch)
treec8a5cc4709e25d459c0ce8a68c6beebaefc20507 /drivers/regulator/max8973-regulator.c
parent69eb0980ab4ced06f7c2b4774575337ce32912fb (diff)
downloadlinux-3064c1f302d1b61dbb0e40e4ffc902edc6208517.tar.xz
regulator: max8973: configure ramp delay through callback
Regulator core framework support the configuration of ramp delay reading from platform specific regulator data via the regulator callback ops. Instead of reading regulator init data on driver and setting ramp delay, use the callback to achieve this. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator/max8973-regulator.c')
-rw-r--r--drivers/regulator/max8973-regulator.c73
1 files changed, 57 insertions, 16 deletions
diff --git a/drivers/regulator/max8973-regulator.c b/drivers/regulator/max8973-regulator.c
index 00cf91cc4c85..663e4df44048 100644
--- a/drivers/regulator/max8973-regulator.c
+++ b/drivers/regulator/max8973-regulator.c
@@ -67,6 +67,7 @@
#define MAX8973_RAMP_25mV_PER_US 0x1
#define MAX8973_RAMP_50mV_PER_US 0x2
#define MAX8973_RAMP_200mV_PER_US 0x3
+#define MAX8973_RAMP_MASK 0x3
/* MAX8973_CONTROL2 */
#define MAX8973_WDTMR_ENABLE BIT(6)
@@ -243,12 +244,45 @@ static unsigned int max8973_dcdc_get_mode(struct regulator_dev *rdev)
REGULATOR_MODE_FAST : REGULATOR_MODE_NORMAL;
}
+static int max8973_set_ramp_delay(struct regulator_dev *rdev,
+ int ramp_delay)
+{
+ struct max8973_chip *max = rdev_get_drvdata(rdev);
+ unsigned int control;
+ int ret;
+ int ret_val;
+
+ /* Set ramp delay */
+ if (ramp_delay < 25000) {
+ control = MAX8973_RAMP_12mV_PER_US;
+ ret_val = 12000;
+ } else if (ramp_delay < 50000) {
+ control = MAX8973_RAMP_25mV_PER_US;
+ ret_val = 25000;
+ } else if (ramp_delay < 200000) {
+ control = MAX8973_RAMP_50mV_PER_US;
+ ret_val = 50000;
+ } else {
+ control = MAX8973_RAMP_200mV_PER_US;
+ ret_val = 200000;
+ }
+
+ ret = regmap_update_bits(max->regmap, MAX8973_CONTROL1,
+ MAX8973_RAMP_MASK, control);
+ if (ret < 0)
+ dev_err(max->dev, "register %d update failed, %d",
+ MAX8973_CONTROL1, ret);
+ return ret;
+}
+
static const struct regulator_ops max8973_dcdc_ops = {
.get_voltage_sel = max8973_dcdc_get_voltage_sel,
.set_voltage_sel = max8973_dcdc_set_voltage_sel,
.list_voltage = regulator_list_voltage_linear,
.set_mode = max8973_dcdc_set_mode,
.get_mode = max8973_dcdc_get_mode,
+ .set_voltage_time_sel = regulator_set_voltage_time_sel,
+ .set_ramp_delay = max8973_set_ramp_delay,
};
static int max8973_init_dcdc(struct max8973_chip *max,
@@ -257,6 +291,29 @@ static int max8973_init_dcdc(struct max8973_chip *max,
int ret;
uint8_t control1 = 0;
uint8_t control2 = 0;
+ unsigned int data;
+
+ ret = regmap_read(max->regmap, MAX8973_CONTROL1, &data);
+ if (ret < 0) {
+ dev_err(max->dev, "register %d read failed, err = %d",
+ MAX8973_CONTROL1, ret);
+ return ret;
+ }
+ control1 = data & MAX8973_RAMP_MASK;
+ switch (control1) {
+ case MAX8973_RAMP_12mV_PER_US:
+ max->desc.ramp_delay = 12000;
+ break;
+ case MAX8973_RAMP_25mV_PER_US:
+ max->desc.ramp_delay = 252000;
+ break;
+ case MAX8973_RAMP_50mV_PER_US:
+ max->desc.ramp_delay = 50000;
+ break;
+ case MAX8973_RAMP_200mV_PER_US:
+ max->desc.ramp_delay = 200000;
+ break;
+ }
if (pdata->control_flags & MAX8973_CONTROL_REMOTE_SENSE_ENABLE)
control1 |= MAX8973_SNS_ENABLE;
@@ -277,22 +334,6 @@ static int max8973_init_dcdc(struct max8973_chip *max,
if (pdata->control_flags & MAX8973_CONTROL_FREQ_SHIFT_9PER_ENABLE)
control1 |= MAX8973_FREQSHIFT_9PER;
- /* Set ramp delay */
- if (pdata->reg_init_data &&
- pdata->reg_init_data->constraints.ramp_delay) {
- if (pdata->reg_init_data->constraints.ramp_delay < 25000)
- control1 |= MAX8973_RAMP_12mV_PER_US;
- else if (pdata->reg_init_data->constraints.ramp_delay < 50000)
- control1 |= MAX8973_RAMP_25mV_PER_US;
- else if (pdata->reg_init_data->constraints.ramp_delay < 200000)
- control1 |= MAX8973_RAMP_50mV_PER_US;
- else
- control1 |= MAX8973_RAMP_200mV_PER_US;
- } else {
- control1 |= MAX8973_RAMP_12mV_PER_US;
- max->desc.ramp_delay = 12500;
- }
-
if (!(pdata->control_flags & MAX8973_CONTROL_PULL_DOWN_ENABLE))
control2 |= MAX8973_DISCH_ENBABLE;