regulator: qcom_smd: Add pmi8994 regulator support

The pmi8994 is commonly found on MSM8996 based devices, such as the
Dragonboard 820c, where it supplies power to a number of LDOs on the
primary PMIC.
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20200324041424.518160-1-bjorn.andersson@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/qcom,smd-rpm-regulator.txt

@@ -26,6 +26,7 @@ Regulator nodes are identified by their compatible:
 		    "qcom,rpm-pm8994-regulators"
 		    "qcom,rpm-pm8998-regulators"
 		    "qcom,rpm-pma8084-regulators"
+		    "qcom,rpm-pmi8994-regulators"
 		    "qcom,rpm-pmi8998-regulators"
 		    "qcom,rpm-pms405-regulators"
 
@@ -143,6 +144,15 @@ Regulator nodes are identified by their compatible:
 	Definition: reference to regulator supplying the input pin, as
 		    described in the data sheet
 
+- vdd_s1-supply:
+- vdd_s2-supply:
+- vdd_s3-supply:
+- vdd_bst_byp-supply:
+	Usage: optional (pmi8994 only)
+	Value type: <phandle>
+	Definition: reference to regulator supplying the input pin, as
+		    described in the data sheet
+
 - vdd_s1-supply:
 - vdd_s2-supply:
 - vdd_s3-supply:
@@ -259,6 +269,9 @@ pma8084:
 	l6, l7, l8, l9, l10, l11, l12, l13, l14, l15, l16, l17, l18, l19, l20,
 	l21, l22, l23, l24, l25, l26, l27, lvs1, lvs2, lvs3, lvs4, 5vs1
 
+pmi8994:
+	s1, s2, s3, boost-bypass
+
 pmi8998:
 	bob
 

drivers/regulator/qcom_smd-regulator.c

@@ -445,6 +445,44 @@ static const struct regulator_desc pm8994_lnldo = {
 	.ops = &rpm_smps_ldo_ops_fixed,
 };
 
+static const struct regulator_desc pmi8994_ftsmps = {
+	.linear_ranges = (struct regulator_linear_range[]) {
+		REGULATOR_LINEAR_RANGE(350000,  0, 199, 5000),
+		REGULATOR_LINEAR_RANGE(700000, 200, 349, 10000),
+	},
+	.n_linear_ranges = 2,
+	.n_voltages = 350,
+	.ops = &rpm_smps_ldo_ops,
+};
+
+static const struct regulator_desc pmi8994_hfsmps = {
+	.linear_ranges = (struct regulator_linear_range[]) {
+		REGULATOR_LINEAR_RANGE(350000,  0,  80, 12500),
+		REGULATOR_LINEAR_RANGE(700000, 81, 141, 25000),
+	},
+	.n_linear_ranges = 2,
+	.n_voltages = 142,
+	.ops = &rpm_smps_ldo_ops,
+};
+
+static const struct regulator_desc pmi8994_bby = {
+	.linear_ranges = (struct regulator_linear_range[]) {
+		REGULATOR_LINEAR_RANGE(3000000, 0, 44, 50000),
+	},
+	.n_linear_ranges = 1,
+	.n_voltages = 45,
+	.ops = &rpm_bob_ops,
+};
+
+static const struct regulator_desc pmi8994_boost = {
+	.linear_ranges = (struct regulator_linear_range[]) {
+		REGULATOR_LINEAR_RANGE(4000000, 0, 30, 50000),
+	},
+	.n_linear_ranges = 1,
+	.n_voltages = 31,
+	.ops = &rpm_smps_ldo_ops,
+};
+
 static const struct regulator_desc pm8998_ftsmps = {
 	.linear_ranges = (struct regulator_linear_range[]) {
 		REGULATOR_LINEAR_RANGE(320000, 0, 258, 4000),
@@ -780,6 +818,14 @@ static const struct rpm_regulator_data rpm_pm8994_regulators[] = {
 	{}
 };
 
+static const struct rpm_regulator_data rpm_pmi8994_regulators[] = {
+	{ "s1", QCOM_SMD_RPM_SMPB, 1, &pmi8994_ftsmps, "vdd_s1" },
+	{ "s2", QCOM_SMD_RPM_SMPB, 2, &pmi8994_hfsmps, "vdd_s2" },
+	{ "s2", QCOM_SMD_RPM_SMPB, 3, &pmi8994_hfsmps, "vdd_s3" },
+	{ "boost-bypass", QCOM_SMD_RPM_BBYB, 1, &pmi8994_bby, "vdd_bst_byp" },
+	{}
+};
+
 static const struct rpm_regulator_data rpm_pm8998_regulators[] = {
 	{ "s1", QCOM_SMD_RPM_SMPA, 1, &pm8998_ftsmps, "vdd_s1" },
 	{ "s2", QCOM_SMD_RPM_SMPA, 2, &pm8998_ftsmps, "vdd_s2" },
@@ -862,6 +908,7 @@ static const struct of_device_id rpm_of_match[] = {
 	{ .compatible = "qcom,rpm-pm8994-regulators", .data = &rpm_pm8994_regulators },
 	{ .compatible = "qcom,rpm-pm8998-regulators", .data = &rpm_pm8998_regulators },
 	{ .compatible = "qcom,rpm-pma8084-regulators", .data = &rpm_pma8084_regulators },
+	{ .compatible = "qcom,rpm-pmi8994-regulators", .data = &rpm_pmi8994_regulators },
 	{ .compatible = "qcom,rpm-pmi8998-regulators", .data = &rpm_pmi8998_regulators },
 	{ .compatible = "qcom,rpm-pms405-regulators", .data = &rpm_pms405_regulators },
 	{}

include/linux/soc/qcom/smd-rpm.h

@@ -10,6 +10,7 @@ struct qcom_smd_rpm;
 /*
  * Constants used for addressing resources in the RPM.
  */
+#define QCOM_SMD_RPM_BBYB	0x62796262
 #define QCOM_SMD_RPM_BOBB	0x62626f62
 #define QCOM_SMD_RPM_BOOST	0x61747362
 #define QCOM_SMD_RPM_BUS_CLK	0x316b6c63