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regulator: rk808: Add function for ramp delay for buck1/buck2 

On rk808 buck1 and buck2 have programmable ramp delays.  Let's add a
function to allow a client of rk808 to set them.

Signed-off-by: Doug Anderson <dianders@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Doug Anderson 2014-09-16 10:22:54 -07:00 committed by Mark Brown
parent 1ed3f8ce83
commit 8af252272a
1 changed files with 55 additions and 2 deletions
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57
drivers/regulator/rk808-regulator.c
View File

@ -28,6 +28,21 @@
#define RK808_BUCK4_VSEL_MASK 0xf
#define RK808_LDO_VSEL_MASK 0x1f
/* Ramp rate definitions for buck1 / buck2 only */
#define RK808_RAMP_RATE_OFFSET 3
#define RK808_RAMP_RATE_MASK (3 << RK808_RAMP_RATE_OFFSET)
#define RK808_RAMP_RATE_2MV_PER_US (0 << RK808_RAMP_RATE_OFFSET)
#define RK808_RAMP_RATE_4MV_PER_US (1 << RK808_RAMP_RATE_OFFSET)
#define RK808_RAMP_RATE_6MV_PER_US (2 << RK808_RAMP_RATE_OFFSET)
#define RK808_RAMP_RATE_10MV_PER_US (3 << RK808_RAMP_RATE_OFFSET)
static const int rk808_buck_config_regs[] = {
RK808_BUCK1_CONFIG_REG,
RK808_BUCK2_CONFIG_REG,
RK808_BUCK3_CONFIG_REG,
RK808_BUCK4_CONFIG_REG,
};
static const struct regulator_linear_range rk808_buck_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(700000, 0, 63, 12500),
};
@ -49,6 +64,44 @@ static const struct regulator_linear_range rk808_ldo6_voltage_ranges[] = {
REGULATOR_LINEAR_RANGE(800000, 0, 17, 100000),
};
static int rk808_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
unsigned int ramp_value = RK808_RAMP_RATE_10MV_PER_US;
unsigned int reg = rk808_buck_config_regs[rdev->desc->id -
RK808_ID_DCDC1];
switch (ramp_delay) {
case 1 ... 2000:
ramp_value = RK808_RAMP_RATE_2MV_PER_US;
break;
case 2001 ... 4000:
ramp_value = RK808_RAMP_RATE_4MV_PER_US;
break;
case 4001 ... 6000:
ramp_value = RK808_RAMP_RATE_6MV_PER_US;
break;
case 6001 ... 10000:
break;
default:
pr_warn("%s ramp_delay: %d not supported, setting 10000\n",
rdev->desc->name, ramp_delay);
}
return regmap_update_bits(rdev->regmap, reg,
RK808_RAMP_RATE_MASK, ramp_value);
}
static struct regulator_ops rk808_buck1_2_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.set_ramp_delay = rk808_set_ramp_delay,
};
static struct regulator_ops rk808_reg_ops = {
.list_voltage = regulator_list_voltage_linear_range,
.map_voltage = regulator_map_voltage_linear_range,
@ -70,7 +123,7 @@ static const struct regulator_desc rk808_reg[] = {
.name = "DCDC_REG1",
.supply_name = "vcc1",
.id = RK808_ID_DCDC1,
.ops = &rk808_reg_ops,
.ops = &rk808_buck1_2_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 64,
.linear_ranges = rk808_buck_voltage_ranges,
@ -84,7 +137,7 @@ static const struct regulator_desc rk808_reg[] = {
.name = "DCDC_REG2",
.supply_name = "vcc2",
.id = RK808_ID_DCDC2,
.ops = &rk808_reg_ops,
.ops = &rk808_buck1_2_ops,
.type = REGULATOR_VOLTAGE,
.n_voltages = 64,
.linear_ranges = rk808_buck_voltage_ranges,