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Subject[PATCH v2 7/7] drivers: regulator: qcom: add PMS405 SPMI regulator
Date
From: Jorge Ramirez <jorge.ramirez-ortiz@linaro.org>

The PMS405 has 5 HFSMPS and 13 LDO regulators,

This commit adds support for one of the 5 HFSMPS regulators (s3) to
the spmi regulator driver.

The PMIC HFSMPS 430 regulators have 8 mV step size and a voltage
control scheme consisting of two 8-bit registers defining a 16-bit
voltage set point in units of millivolts

S3 controls the cpu voltages (s3 is a buck regulator of type HFS430);
it is therefore required so we can enable voltage scaling for safely
running cpufreq.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
---
drivers/regulator/qcom_spmi-regulator.c | 41 +++++++++++++++++++++++--
1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/drivers/regulator/qcom_spmi-regulator.c b/drivers/regulator/qcom_spmi-regulator.c
index c7880c1d4bcd..975655e787fe 100644
--- a/drivers/regulator/qcom_spmi-regulator.c
+++ b/drivers/regulator/qcom_spmi-regulator.c
@@ -105,6 +105,7 @@ enum spmi_regulator_logical_type {
SPMI_REGULATOR_LOGICAL_TYPE_ULT_HO_SMPS,
SPMI_REGULATOR_LOGICAL_TYPE_ULT_LDO,
SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS426,
+ SPMI_REGULATOR_LOGICAL_TYPE_HFS430,
};

enum spmi_regulator_type {
@@ -157,6 +158,7 @@ enum spmi_regulator_subtype {
SPMI_REGULATOR_SUBTYPE_ULT_HF_CTL2 = 0x0e,
SPMI_REGULATOR_SUBTYPE_ULT_HF_CTL3 = 0x0f,
SPMI_REGULATOR_SUBTYPE_ULT_HF_CTL4 = 0x10,
+ SPMI_REGULATOR_SUBTYPE_HFS430 = 0x0a,
};

enum spmi_common_regulator_registers {
@@ -302,6 +304,8 @@ enum spmi_common_control_register_index {
/* Clock rate in kHz of the FTSMPS426 regulator reference clock. */
#define SPMI_FTSMPS426_CLOCK_RATE 4800

+#define SPMI_HFS430_CLOCK_RATE 1600
+
/* Minimum voltage stepper delay for each step. */
#define SPMI_FTSMPS426_STEP_DELAY 2

@@ -515,6 +519,10 @@ static struct spmi_voltage_range ult_pldo_ranges[] = {
SPMI_VOLTAGE_RANGE(0, 1750000, 1750000, 3337500, 3337500, 12500),
};

+static struct spmi_voltage_range hfs430_ranges[] = {
+ SPMI_VOLTAGE_RANGE(0, 320000, 320000, 2040000, 2040000, 8000),
+};
+
static DEFINE_SPMI_SET_POINTS(pldo);
static DEFINE_SPMI_SET_POINTS(nldo1);
static DEFINE_SPMI_SET_POINTS(nldo2);
@@ -530,6 +538,7 @@ static DEFINE_SPMI_SET_POINTS(ult_lo_smps);
static DEFINE_SPMI_SET_POINTS(ult_ho_smps);
static DEFINE_SPMI_SET_POINTS(ult_nldo);
static DEFINE_SPMI_SET_POINTS(ult_pldo);
+static DEFINE_SPMI_SET_POINTS(hfs430);

static inline int spmi_vreg_read(struct spmi_regulator *vreg, u16 addr, u8 *buf,
int len)
@@ -1397,12 +1406,24 @@ static struct regulator_ops spmi_ftsmps426_ops = {
.set_pull_down = spmi_regulator_common_set_pull_down,
};

+static struct regulator_ops spmi_hfs430_ops = {
+ /* always on regulators */
+ .set_voltage_sel = spmi_regulator_ftsmps426_set_voltage,
+ .set_voltage_time_sel = spmi_regulator_set_voltage_time_sel,
+ .get_voltage = spmi_regulator_ftsmps426_get_voltage,
+ .map_voltage = spmi_regulator_single_map_voltage,
+ .list_voltage = spmi_regulator_common_list_voltage,
+ .set_mode = spmi_regulator_ftsmps426_set_mode,
+ .get_mode = spmi_regulator_ftsmps426_get_mode,
+};
+
/* Maximum possible digital major revision value */
#define INF 0xFF

static const struct spmi_regulator_mapping supported_regulators[] = {
/* type subtype dig_min dig_max ltype ops setpoints hpm_min */
SPMI_VREG(BUCK, GP_CTL, 0, INF, SMPS, smps, smps, 100000),
+ SPMI_VREG(BUCK, HFS430, 0, INF, HFS430, hfs430, hfs430, 10000),
SPMI_VREG(LDO, N300, 0, INF, LDO, ldo, nldo1, 10000),
SPMI_VREG(LDO, N600, 0, 0, LDO, ldo, nldo2, 10000),
SPMI_VREG(LDO, N1200, 0, 0, LDO, ldo, nldo2, 10000),
@@ -1570,7 +1591,8 @@ static int spmi_regulator_init_slew_rate(struct spmi_regulator *vreg)
return ret;
}

-static int spmi_regulator_init_slew_rate_ftsmps426(struct spmi_regulator *vreg)
+static int spmi_regulator_init_slew_rate_ftsmps426(struct spmi_regulator *vreg,
+ int clock_rate)
{
int ret;
u8 reg = 0;
@@ -1587,7 +1609,7 @@ static int spmi_regulator_init_slew_rate_ftsmps426(struct spmi_regulator *vreg)
delay >>= SPMI_FTSMPS426_STEP_CTRL_DELAY_SHIFT;

/* slew_rate has units of uV/us */
- slew_rate = SPMI_FTSMPS426_CLOCK_RATE * range->step_uV;
+ slew_rate = clock_rate * range->step_uV;
slew_rate /= 1000 * (SPMI_FTSMPS426_STEP_DELAY << delay);
slew_rate *= SPMI_FTSMPS426_STEP_MARGIN_NUM;
slew_rate /= SPMI_FTSMPS426_STEP_MARGIN_DEN;
@@ -1739,7 +1761,14 @@ static int spmi_regulator_of_parse(struct device_node *node,
return ret;
break;
case SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS426:
- ret = spmi_regulator_init_slew_rate_ftsmps426(vreg);
+ ret = spmi_regulator_init_slew_rate_ftsmps426(vreg,
+ SPMI_FTSMPS426_CLOCK_RATE);
+ if (ret)
+ return ret;
+ break;
+ case SPMI_REGULATOR_LOGICAL_TYPE_HFS430:
+ ret = spmi_regulator_init_slew_rate_ftsmps426(vreg,
+ SPMI_HFS430_CLOCK_RATE);
if (ret)
return ret;
break;
@@ -1907,6 +1936,11 @@ static const struct spmi_regulator_data pm8005_regulators[] = {
{ }
};

+static const struct spmi_regulator_data pms405_regulators[] = {
+ { "s3", 0x1a00, }, /* supply name in the dts only */
+ { }
+};
+
static const struct of_device_id qcom_spmi_regulator_match[] = {
{ .compatible = "qcom,pm8005-regulators", .data = &pm8005_regulators },
{ .compatible = "qcom,pm8841-regulators", .data = &pm8841_regulators },
@@ -1914,6 +1948,7 @@ static const struct of_device_id qcom_spmi_regulator_match[] = {
{ .compatible = "qcom,pm8941-regulators", .data = &pm8941_regulators },
{ .compatible = "qcom,pm8994-regulators", .data = &pm8994_regulators },
{ .compatible = "qcom,pmi8994-regulators", .data = &pmi8994_regulators },
+ { .compatible = "qcom,pms405-regulators", .data = &pms405_regulators },
{ }
};
MODULE_DEVICE_TABLE(of, qcom_spmi_regulator_match);
--
2.17.1
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