regulator: qcom_spmi: add PMS405 SPMI regulator

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 <[e-mail]>
Signed-off-by: Jeffrey Hugo <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/regulator/qcom_spmi-regulator.c

···
 	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 {
···
 	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 {
···
 
 /* 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
···
 	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);
···
 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)
···
 	.set_pull_down		= spmi_regulator_common_set_pull_down,
 };
 
+static struct regulator_ops spmi_hfs430_ops = {
+	.enable			= regulator_enable_regmap,
+	.disable		= regulator_disable_regmap,
+	.is_enabled		= regulator_is_enabled_regmap,
+	.set_voltage_sel	= spmi_regulator_ftsmps426_set_voltage,
+	.set_voltage_time_sel	= spmi_regulator_set_voltage_time_sel,
+	.get_voltage_sel	= 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),
···
 	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;
···
 	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;
···
 			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;
···
 	{ }
 };
 
+static const struct spmi_regulator_data pms405_regulators[] = {
+	{ "s3", 0x1a00, "vdd_s3"},
+	{ }
+};
+
 static const struct of_device_id qcom_spmi_regulator_match[] = {
 	{ .compatible = "qcom,pm8005-regulators", .data = &pm8005_regulators },
 	{ .compatible = "qcom,pm8841-regulators", .data = &pm8841_regulators },
···
 	{ .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);