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regulator: qcom-labibb: Implement pull-down, softstart, active discharge 

Soft start is required to avoid inrush current during LAB ramp-up and
IBB ramp-down, protecting connected hardware to which we supply voltage.

Since soft start is configurable on both LAB and IBB regulators, it
was necessary to add two DT properties, respectively "qcom,soft-start-us"
to control LAB ramp-up and "qcom,discharge-resistor-kohms" to control
the discharge resistor for IBB ramp-down, which obviously brought the
need of implementing a of_parse callback for both regulators.

Finally, also implement pull-down mode in order to avoid unpredictable
behavior when the regulators are disabled (random voltage spikes etc).

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20210119174421.226541-4-angelogioacchino.delregno@somainline.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
AngeloGioacchino Del Regno 2021-01-19 18:44:17 +01:00 committed by Mark Brown
parent 8056704ba9
commit 3bc7cb99fb
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GPG Key ID: 24D68B725D5487D0
1 changed files with 94 additions and 0 deletions
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94
drivers/regulator/qcom-labibb-regulator.c
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@ -29,12 +29,23 @@
#define LABIBB_STATUS1_VREG_OK_BIT BIT(7)
#define LABIBB_CONTROL_ENABLE BIT(7)
#define REG_LABIBB_PD_CTL 0x47
#define LAB_PD_CTL_MASK GENMASK(1, 0)
#define IBB_PD_CTL_MASK (BIT(0) | BIT(7))
#define LAB_PD_CTL_STRONG_PULL BIT(0)
#define IBB_PD_CTL_HALF_STRENGTH BIT(0)
#define IBB_PD_CTL_EN BIT(7)
#define REG_LABIBB_CURRENT_LIMIT 0x4b
#define LAB_CURRENT_LIMIT_MASK GENMASK(2, 0)
#define IBB_CURRENT_LIMIT_MASK GENMASK(4, 0)
#define LAB_CURRENT_LIMIT_OVERRIDE_EN BIT(3)
#define LABIBB_CURRENT_LIMIT_EN BIT(7)
#define REG_IBB_PWRUP_PWRDN_CTL_1 0x58
#define IBB_CTL_1_DISCHARGE_EN BIT(2)
#define REG_LABIBB_SOFT_START_CTL 0x5f
#define REG_LABIBB_SEC_ACCESS 0xd0
#define LABIBB_SEC_UNLOCK_CODE 0xa5
@ -60,6 +71,8 @@ struct labibb_regulator {
struct labibb_current_limits uA_limits;
u16 base;
u8 type;
u8 dischg_sel;
u8 soft_start_sel;
};
struct labibb_regulator_data {
@ -120,6 +133,70 @@ static int qcom_labibb_get_current_limit(struct regulator_dev *rdev)
return (cur_step * lim->uA_step) + lim->uA_min;
}
static int qcom_labibb_set_soft_start(struct regulator_dev *rdev)
{
struct labibb_regulator *vreg = rdev_get_drvdata(rdev);
u32 val = 0;
if (vreg->type == QCOM_IBB_TYPE)
val = vreg->dischg_sel;
else
val = vreg->soft_start_sel;
return regmap_write(rdev->regmap, rdev->desc->soft_start_reg, val);
}
static int qcom_labibb_get_table_sel(const int *table, int sz, u32 value)
{
int i;
for (i = 0; i < sz; i++)
if (table[i] == value)
return i;
return -EINVAL;
}
/* IBB discharge resistor values in KOhms */
static const int dischg_resistor_values[] = { 300, 64, 32, 16 };
/* Soft start time in microseconds */
static const int soft_start_values[] = { 200, 400, 600, 800 };
static int qcom_labibb_of_parse_cb(struct device_node *np,
const struct regulator_desc *desc,
struct regulator_config *config)
{
struct labibb_regulator *vreg = config->driver_data;
u32 dischg_kohms, soft_start_time;
int ret;
ret = of_property_read_u32(np, "qcom,discharge-resistor-kohms",
&dischg_kohms);
if (ret)
dischg_kohms = 300;
ret = qcom_labibb_get_table_sel(dischg_resistor_values,
ARRAY_SIZE(dischg_resistor_values),
dischg_kohms);
if (ret < 0)
return ret;
vreg->dischg_sel = (u8)ret;
ret = of_property_read_u32(np, "qcom,soft-start-us",
&soft_start_time);
if (ret)
soft_start_time = 200;
ret = qcom_labibb_get_table_sel(soft_start_values,
ARRAY_SIZE(soft_start_values),
soft_start_time);
if (ret < 0)
return ret;
vreg->soft_start_sel = (u8)ret;
return 0;
}
static const struct regulator_ops qcom_labibb_ops = {
.enable = regulator_enable_regmap,
.disable = regulator_disable_regmap,
@ -128,8 +205,11 @@ static const struct regulator_ops qcom_labibb_ops = {
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.list_voltage = regulator_list_voltage_linear,
.map_voltage = regulator_map_voltage_linear,
.set_active_discharge = regulator_set_active_discharge_regmap,
.set_pull_down = regulator_set_pull_down_regmap,
.set_current_limit = qcom_labibb_set_current_limit,
.get_current_limit = qcom_labibb_get_current_limit,
.set_soft_start = qcom_labibb_set_soft_start,
};
static const struct regulator_desc pmi8998_lab_desc = {
@ -138,6 +218,10 @@ static const struct regulator_desc pmi8998_lab_desc = {
.enable_val = LABIBB_CONTROL_ENABLE,
.enable_time = LAB_ENABLE_TIME,
.poll_enabled_time = LABIBB_POLL_ENABLED_TIME,
.soft_start_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_SOFT_START_CTL),
.pull_down_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_PD_CTL),
.pull_down_mask = LAB_PD_CTL_MASK,
.pull_down_val_on = LAB_PD_CTL_STRONG_PULL,
.vsel_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_VOLTAGE),
.vsel_mask = LAB_VOLTAGE_SET_MASK,
.apply_reg = (PMI8998_LAB_REG_BASE + REG_LABIBB_VOLTAGE),
@ -152,6 +236,7 @@ static const struct regulator_desc pmi8998_lab_desc = {
.uV_step = 100000,
.n_voltages = 16,
.ops = &qcom_labibb_ops,
.of_parse_cb = qcom_labibb_of_parse_cb,
};
static const struct regulator_desc pmi8998_ibb_desc = {
@ -160,6 +245,14 @@ static const struct regulator_desc pmi8998_ibb_desc = {
.enable_val = LABIBB_CONTROL_ENABLE,
.enable_time = IBB_ENABLE_TIME,
.poll_enabled_time = LABIBB_POLL_ENABLED_TIME,
.soft_start_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_SOFT_START_CTL),
.active_discharge_off = 0,
.active_discharge_on = IBB_CTL_1_DISCHARGE_EN,
.active_discharge_mask = IBB_CTL_1_DISCHARGE_EN,
.active_discharge_reg = (PMI8998_IBB_REG_BASE + REG_IBB_PWRUP_PWRDN_CTL_1),
.pull_down_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_PD_CTL),
.pull_down_mask = IBB_PD_CTL_MASK,
.pull_down_val_on = IBB_PD_CTL_HALF_STRENGTH | IBB_PD_CTL_EN,
.vsel_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_VOLTAGE),
.vsel_mask = IBB_VOLTAGE_SET_MASK,
.apply_reg = (PMI8998_IBB_REG_BASE + REG_LABIBB_VOLTAGE),
@ -174,6 +267,7 @@ static const struct regulator_desc pmi8998_ibb_desc = {
.uV_step = 100000,
.n_voltages = 64,
.ops = &qcom_labibb_ops,
.of_parse_cb = qcom_labibb_of_parse_cb,
};
static const struct labibb_regulator_data pmi8998_labibb_data[] = {