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regulator: mcp16502: add support for ramp delay 

MCP16502 have configurable ramp delay support (via DVSR bits in
regulators' CFG register).

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1605280870-32432-6-git-send-email-claudiu.beznea@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Claudiu Beznea 2020-11-13 17:21:09 +02:00 committed by Mark Brown
parent 3e5532a011
commit 322eb8666d
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 87 additions and 2 deletions
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89
drivers/regulator/mcp16502.c
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@ -22,8 +22,9 @@
#define VDD_LOW_SEL 0x0D
#define VDD_HIGH_SEL 0x3F
#define MCP16502_FLT BIT(7)
#define MCP16502_ENS BIT(0)
#define MCP16502_FLT BIT(7)
#define MCP16502_DVSR GENMASK(3, 2)
#define MCP16502_ENS BIT(0)
/*
* The PMIC has four sets of registers corresponding to four power modes:
@ -88,6 +89,12 @@ enum mcp16502_reg {
MCP16502_REG_CFG,
};
/* Ramp delay (uV/us) for buck1, ldo1, ldo2. */
static const int mcp16502_ramp_b1l12[] = { 6250, 3125, 2083, 1563 };
/* Ramp delay (uV/us) for buck2, buck3, buck4. */
static const int mcp16502_ramp_b234[] = { 3125, 1563, 1042, 781 };
static unsigned int mcp16502_of_map_mode(unsigned int mode)
{
if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE)
@ -271,6 +278,80 @@ static int mcp16502_get_status(struct regulator_dev *rdev)
return REGULATOR_STATUS_UNDEFINED;
}
static int mcp16502_set_voltage_time_sel(struct regulator_dev *rdev,
unsigned int old_sel,
unsigned int new_sel)
{
static const u8 us_ramp[] = { 8, 16, 24, 32 };
int id = rdev_get_id(rdev);
unsigned int uV_delta, val;
int ret;
ret = regmap_read(rdev->regmap, MCP16502_REG_BASE(id, CFG), &val);
if (ret)
return ret;
val = (val & MCP16502_DVSR) >> 2;
uV_delta = abs(new_sel * rdev->desc->linear_ranges->step -
old_sel * rdev->desc->linear_ranges->step);
switch (id) {
case BUCK1:
case LDO1:
case LDO2:
ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
mcp16502_ramp_b1l12[val]);
break;
case BUCK2:
case BUCK3:
case BUCK4:
ret = DIV_ROUND_CLOSEST(uV_delta * us_ramp[val],
mcp16502_ramp_b234[val]);
break;
default:
return -EINVAL;
}
return ret;
}
static int mcp16502_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
{
const int *ramp;
int id = rdev_get_id(rdev);
unsigned int i, size;
switch (id) {
case BUCK1:
case LDO1:
case LDO2:
ramp = mcp16502_ramp_b1l12;
size = ARRAY_SIZE(mcp16502_ramp_b1l12);
break;
case BUCK2:
case BUCK3:
case BUCK4:
ramp = mcp16502_ramp_b234;
size = ARRAY_SIZE(mcp16502_ramp_b234);
break;
default:
return -EINVAL;
}
for (i = 0; i < size; i++) {
if (ramp[i] == ramp_delay)
break;
}
if (i == size)
return -EINVAL;
return regmap_update_bits(rdev->regmap, MCP16502_REG_BASE(id, CFG),
MCP16502_DVSR, (i << 2));
}
#ifdef CONFIG_SUSPEND
/*
* mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC
@ -365,6 +446,8 @@ static const struct regulator_ops mcp16502_buck_ops = {
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_status = mcp16502_get_status,
.set_voltage_time_sel = mcp16502_set_voltage_time_sel,
.set_ramp_delay = mcp16502_set_ramp_delay,
.set_mode = mcp16502_set_mode,
.get_mode = mcp16502_get_mode,
@ -389,6 +472,8 @@ static const struct regulator_ops mcp16502_ldo_ops = {
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.get_status = mcp16502_get_status,
.set_voltage_time_sel = mcp16502_set_voltage_time_sel,
.set_ramp_delay = mcp16502_set_ramp_delay,
#ifdef CONFIG_SUSPEND
.set_suspend_voltage = mcp16502_set_suspend_voltage,