regulator: qcom_spmi: Add support for HFSMPS regulator type

This is preparation for supporing PM6125.

The HFSMPS is a BUCK type regulator with subtype 0x0a, same as the
existing HFS430 regulator.

Even though the HFSMPS and HFS430 share a type and subtype, the HFSMPS has
an updated register map, including different mode values, moved pull down
register, and different slew rate address and formula.

In addition to NORMAL (NPM), FAST (AUTO_LPM) and IDLE (LPM), the
regulator also supports RETENTION and AUTO_RM which are currently
unselectable by the driver.

The inspiration of this is taken from [1].

[1] https://source.codeaurora.org/quic/la/kernel/msm-5.4/commit/?h=kernel.lnx.5.4.r1-rel&id=d1220daeffaa440ffff0a8c47322eb0033bf54f5Signed-off-by: Iskren Chernev <iskren.chernev@gmail.com>
Link: https://lore.kernel.org/r/20220802221112.2280686-6-iskren.chernev@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/regulator/qcom_spmi-regulator.c

@@ -99,6 +99,7 @@ enum spmi_regulator_logical_type {
 	SPMI_REGULATOR_LOGICAL_TYPE_ULT_LDO,
 	SPMI_REGULATOR_LOGICAL_TYPE_FTSMPS426,
 	SPMI_REGULATOR_LOGICAL_TYPE_HFS430,
+	SPMI_REGULATOR_LOGICAL_TYPE_HFSMPS,
 };
 
 enum spmi_regulator_type {
@@ -166,6 +167,7 @@ enum spmi_regulator_subtype {
 	SPMI_REGULATOR_SUBTYPE_HFS430		= 0x0a,
 	SPMI_REGULATOR_SUBTYPE_HT_P150		= 0x35,
 	SPMI_REGULATOR_SUBTYPE_HT_P600		= 0x3d,
+	SPMI_REGULATOR_SUBTYPE_HFSMPS_510	= 0x0a,
 };
 
 enum spmi_common_regulator_registers {
@@ -193,6 +195,14 @@ enum spmi_ftsmps426_regulator_registers {
 	SPMI_FTSMPS426_REG_VOLTAGE_ULS_MSB	= 0x69,
 };
 
+/*
+ * Third common register layout
+ */
+enum spmi_hfsmps_regulator_registers {
+	SPMI_HFSMPS_REG_STEP_CTRL		= 0x3c,
+	SPMI_HFSMPS_REG_PULL_DOWN		= 0xa0,
+};
+
 enum spmi_vs_registers {
 	SPMI_VS_REG_OCP				= 0x4a,
 	SPMI_VS_REG_SOFT_START			= 0x4c,
@@ -260,6 +270,15 @@ enum spmi_common_control_register_index {
 
 #define SPMI_FTSMPS426_MODE_MASK		0x07
 
+/* Third common regulator mode register values */
+#define SPMI_HFSMPS_MODE_BYPASS_MASK		2
+#define SPMI_HFSMPS_MODE_RETENTION_MASK		3
+#define SPMI_HFSMPS_MODE_LPM_MASK		4
+#define SPMI_HFSMPS_MODE_AUTO_MASK		6
+#define SPMI_HFSMPS_MODE_HPM_MASK		7
+
+#define SPMI_HFSMPS_MODE_MASK			0x07
+
 /* Common regulator pull down control register layout */
 #define SPMI_COMMON_PULL_DOWN_ENABLE_MASK	0x80
 
@@ -305,6 +324,9 @@ enum spmi_common_control_register_index {
 #define SPMI_FTSMPS_STEP_MARGIN_NUM	4
 #define SPMI_FTSMPS_STEP_MARGIN_DEN	5
 
+/* slew_rate has units of uV/us. */
+#define SPMI_HFSMPS_SLEW_RATE_38p4 38400
+
 #define SPMI_FTSMPS426_STEP_CTRL_DELAY_MASK	0x03
 #define SPMI_FTSMPS426_STEP_CTRL_DELAY_SHIFT	0
 
@@ -1062,6 +1084,23 @@ static unsigned int spmi_regulator_ftsmps426_get_mode(struct regulator_dev *rdev
 	}
 }
 
+static unsigned int spmi_regulator_hfsmps_get_mode(struct regulator_dev *rdev)
+{
+	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
+	u8 reg;
+
+	spmi_vreg_read(vreg, SPMI_COMMON_REG_MODE, &reg, 1);
+
+	switch (reg) {
+	case SPMI_HFSMPS_MODE_HPM_MASK:
+		return REGULATOR_MODE_NORMAL;
+	case SPMI_HFSMPS_MODE_AUTO_MASK:
+		return REGULATOR_MODE_FAST;
+	default:
+		return REGULATOR_MODE_IDLE;
+	}
+}
+
 static int
 spmi_regulator_common_set_mode(struct regulator_dev *rdev, unsigned int mode)
 {
@@ -1108,6 +1147,30 @@ spmi_regulator_ftsmps426_set_mode(struct regulator_dev *rdev, unsigned int mode)
 	return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_MODE, val, mask);
 }
 
+static int
+spmi_regulator_hfsmps_set_mode(struct regulator_dev *rdev, unsigned int mode)
+{
+	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
+	u8 mask = SPMI_HFSMPS_MODE_MASK;
+	u8 val;
+
+	switch (mode) {
+	case REGULATOR_MODE_NORMAL:
+		val = SPMI_HFSMPS_MODE_HPM_MASK;
+		break;
+	case REGULATOR_MODE_FAST:
+		val = SPMI_HFSMPS_MODE_AUTO_MASK;
+		break;
+	case REGULATOR_MODE_IDLE:
+		val = SPMI_HFSMPS_MODE_LPM_MASK;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return spmi_vreg_update_bits(vreg, SPMI_COMMON_REG_MODE, val, mask);
+}
+
 static int
 spmi_regulator_common_set_load(struct regulator_dev *rdev, int load_uA)
 {
@@ -1131,6 +1194,15 @@ static int spmi_regulator_common_set_pull_down(struct regulator_dev *rdev)
 				     mask, mask);
 }
 
+static int spmi_regulator_hfsmps_set_pull_down(struct regulator_dev *rdev)
+{
+	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
+	unsigned int mask = SPMI_COMMON_PULL_DOWN_ENABLE_MASK;
+
+	return spmi_vreg_update_bits(vreg, SPMI_HFSMPS_REG_PULL_DOWN,
+				     mask, mask);
+}
+
 static int spmi_regulator_common_set_soft_start(struct regulator_dev *rdev)
 {
 	struct spmi_regulator *vreg = rdev_get_drvdata(rdev);
@@ -1465,6 +1537,21 @@ static const struct regulator_ops spmi_hfs430_ops = {
 	.get_mode		= spmi_regulator_ftsmps426_get_mode,
 };
 
+static const struct regulator_ops spmi_hfsmps_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_hfsmps_set_mode,
+	.get_mode		= spmi_regulator_hfsmps_get_mode,
+	.set_load		= spmi_regulator_common_set_load,
+	.set_pull_down		= spmi_regulator_hfsmps_set_pull_down,
+};
+
 /* Maximum possible digital major revision value */
 #define INF 0xFF
 
@@ -1473,7 +1560,8 @@ static const struct spmi_regulator_mapping supported_regulators[] = {
 	SPMI_VREG(LDO,   HT_P600,  0, INF, HFS430, hfs430, ht_p600, 10000),
 	SPMI_VREG(LDO,   HT_P150,  0, INF, HFS430, hfs430, ht_p150, 10000),
 	SPMI_VREG(BUCK,  GP_CTL,   0, INF, SMPS,   smps,   smps,   100000),
-	SPMI_VREG(BUCK,  HFS430,   0, INF, HFS430, hfs430, hfs430,  10000),
+	SPMI_VREG(BUCK,  HFS430,   0,   3, HFS430, hfs430, hfs430,  10000),
+	SPMI_VREG(BUCK,  HFSMPS_510, 4, INF, HFSMPS, hfsmps, hfs430, 100000),
 	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),
@@ -1696,6 +1784,26 @@ static int spmi_regulator_init_slew_rate_ftsmps426(struct spmi_regulator *vreg,
 	return ret;
 }
 
+static int spmi_regulator_init_slew_rate_hfsmps(struct spmi_regulator *vreg)
+{
+	int ret;
+	u8 reg = 0;
+	int delay;
+
+	ret = spmi_vreg_read(vreg, SPMI_HFSMPS_REG_STEP_CTRL, &reg, 1);
+	if (ret) {
+		dev_err(vreg->dev, "spmi read failed, ret=%d\n", ret);
+		return ret;
+	}
+
+	delay = reg & SPMI_FTSMPS426_STEP_CTRL_DELAY_MASK;
+	delay >>= SPMI_FTSMPS426_STEP_CTRL_DELAY_SHIFT;
+
+	vreg->slew_rate = SPMI_HFSMPS_SLEW_RATE_38p4 >> delay;
+
+	return ret;
+}
+
 static int spmi_regulator_init_registers(struct spmi_regulator *vreg,
 				const struct spmi_regulator_init_data *data)
 {
@@ -1846,6 +1954,11 @@ static int spmi_regulator_of_parse(struct device_node *node,
 		if (ret)
 			return ret;
 		break;
+	case SPMI_REGULATOR_LOGICAL_TYPE_HFSMPS:
+		ret = spmi_regulator_init_slew_rate_hfsmps(vreg);
+		if (ret)
+			return ret;
+		break;
 	default:
 		break;
 	}