dts: nxp_vref: Add current compensation prop

Add DT property to enable current compensation feature of NXP VREF.

Signed-off-by: Declan Snyder <[email protected]>

Author: decsny

drivers/regulator/regulator_nxp_vref.c

@@ -26,6 +26,7 @@ struct regulator_nxp_vref_config {
 	VREF_Type *base;
 	uint16_t buf_start_delay;
 	uint16_t bg_start_time;
+	bool current_compensation_en;
 };
 
 static int regulator_nxp_vref_enable(const struct device *dev)
@@ -183,6 +184,8 @@ static const struct regulator_driver_api api = {
 
 static int regulator_nxp_vref_init(const struct device *dev)
 {
+	const struct regulator_nxp_vref_config *config = dev->config;
+	VREF_Type *const base = config->base;
 	int ret;
 
 	regulator_common_data_init(dev);
@@ -192,6 +195,10 @@ static int regulator_nxp_vref_init(const struct device *dev)
 		return ret;
 	}
 
+	if (config->current_compensation_en) {
+		base->CSR |= VREF_CSR_ICOMPEN_MASK;
+	}
+
 	return regulator_common_init(dev, false);
 }
 
@@ -205,6 +212,8 @@ static int regulator_nxp_vref_init(const struct device *dev)
 				nxp_buffer_startup_delay_us),			\
 		.bg_start_time = DT_INST_PROP(inst,				\
 				nxp_bandgap_startup_time_us),			\
+		.current_compensation_en = DT_INST_PROP(inst,			\
+				nxp_current_compensation_en),			\
 	};									\
 										\
 	DEVICE_DT_INST_DEFINE(inst, regulator_nxp_vref_init, NULL, &data_##inst,\

dts/bindings/regulator/nxp,vref.yaml

@@ -34,6 +34,13 @@ properties:
       Maximum bandgap startup time as specified in the
       appropriate device data sheet, in microseconds.
 
+  nxp,current-compensation-en:
+    type: boolean
+    description: |
+      Enable second-order curvature compensation.
+      This must be enabled to achieve the performance stated in the datasheet.
+      However, the reset value of the peripheral has it disabled.
+
   "#nxp,reference-cells":
     type: int
     const: 1