drivers: regulator: support regulator-boot-on for PMIC driver

Add support for regulator-boot-on to PMIC driver. Many PMIC devices will
be enabled at boot, so this property allows the regulator framework
to correctly track their state.

Signed-off-by: Daniel DeGrasse <daniel.degrasse@nxp.com>

boards/arm/mimxrt595_evk/mimxrt595_evk_cm33.dts

@@ -191,6 +191,7 @@ arduino_serial: &flexcomm12 {
 			enable-val = <PCA9420_MODECFG_2_SW1_EN_VAL>;
 			min-uV = <500000>;
 			max-uV = <1800000>;
+			regulator-boot-on;
 		};
 
 		pca9420_sw2: sw2_buck {
@@ -207,6 +208,7 @@ arduino_serial: &flexcomm12 {
 			enable-val = <PCA9420_MODECFG_2_SW2_EN_VAL>;
 			min-uV = <1500000>;
 			max-uV = <3300000>;
+			regulator-boot-on;
 		};
 
 		pca9420_ldo1: ldo1_reg {
@@ -223,6 +225,7 @@ arduino_serial: &flexcomm12 {
 			enable-val = <PCA9420_MODECFG_2_LDO1_EN_VAL>;
 			min-uV = <1700000>;
 			max-uV = <1900000>;
+			regulator-boot-on;
 		};
 
 		pca9420_ldo2: ldo2_reg {
@@ -239,6 +242,7 @@ arduino_serial: &flexcomm12 {
 			enable-val = <PCA9420_MODECFG_2_LDO2_EN_VAL>;
 			min-uV = <1500000>;
 			max-uV = <3300000>;
+			regulator-boot-on;
 		};
 
 

boards/arm/mimxrt685_evk/mimxrt685_evk_cm33.dts

@@ -265,6 +265,7 @@ i2s1: &flexcomm3 {
 			enable-val = <PCA9420_MODECFG_2_SW1_EN_VAL>;
 			min-uV = <500000>;
 			max-uV = <1800000>;
+			regulator-boot-on;
 		};
 
 		pca9420_sw2: sw2_buck {
@@ -281,6 +282,7 @@ i2s1: &flexcomm3 {
 			enable-val = <PCA9420_MODECFG_2_SW2_EN_VAL>;
 			min-uV = <1500000>;
 			max-uV = <3300000>;
+			regulator-boot-on;
 		};
 
 		pca9420_ldo1: ldo1_reg {
@@ -297,6 +299,7 @@ i2s1: &flexcomm3 {
 			enable-val = <PCA9420_MODECFG_2_LDO1_EN_VAL>;
 			min-uV = <1700000>;
 			max-uV = <1900000>;
+			regulator-boot-on;
 		};
 
 		pca9420_ldo2: ldo2_reg {
@@ -313,6 +316,7 @@ i2s1: &flexcomm3 {
 			enable-val = <PCA9420_MODECFG_2_LDO2_EN_VAL>;
 			min-uV = <1500000>;
 			max-uV = <3300000>;
+			regulator-boot-on;
 		};
 
 

drivers/regulator/regulator_pmic.c

@@ -53,6 +53,7 @@ struct regulator_config {
 	uint8_t enable_mask;
 	uint8_t enable_val;
 	bool enable_inverted;
+	bool boot_on;
 	uint8_t ilim_reg;
 	uint8_t ilim_mask;
 	struct i2c_dt_spec i2c;
@@ -502,6 +503,7 @@ static int pmic_reg_init(const struct device *dev)
 {
 	const struct regulator_config *config = dev->config;
 	struct regulator_data *data = dev->data;
+	int rc  = 0;
 
 	/* Cast the voltage array set at compile time to the voltage range
 	 * struct
@@ -513,10 +515,13 @@ static int pmic_reg_init(const struct device *dev)
 	if (!device_is_ready(config->i2c.bus)) {
 		return -ENODEV;
 	}
-	if (config->initial_mode) {
+	if (config->boot_on) {
-		return regulator_set_mode(dev, config->initial_mode);
+		rc = enable_regulator(dev, NULL);
 	}
-	return 0;
+	if (config->initial_mode) {
+		rc = regulator_set_mode(dev, config->initial_mode);
+	}
+	return rc;
 }
 
 
@@ -554,6 +559,7 @@ static const struct regulator_driver_api api = {
 		.ilim_reg = DT_PROP_OR(node, ilim_reg, 0),					\
 		.ilim_mask = DT_PROP_OR(node, ilim_mask, 0),					\
 		.enable_inverted = DT_PROP(node, enable_inverted),				\
+		.boot_on = DT_PROP_OR(node, regulator_boot_on, false),				\
 		.num_modes = ARRAY_SIZE(pmic_reg_##ord##_allowed_modes),			\
 		.initial_mode = DT_PROP_OR(DT_PARENT(node), regulator_initial_mode, 0),		\
 		.i2c = I2C_DT_SPEC_GET(DT_PARENT(node)),					\

dts/bindings/regulator/regulator-pmic.yaml

@@ -3,10 +3,11 @@
 
 description: PMIC controlled regulator
 
-include: regulator.yaml
 
 compatible: "regulator-pmic"
 
+include: base.yaml
+
 properties:
   regulator-initial-mode:
       type: int
@@ -38,6 +39,10 @@ properties:
       to the modesel-reg.
 
 child-binding:
+  include:
+    - name: regulator.yaml
+      property-allowlist:
+        - regulator-boot-on
   description: Voltage output of PMIC controller regulator
   properties:
       voltage-range: