[PATCH v2 1/1] arm64: dts: imx91-var-dart-sonata: add RGB enable supply for PCA6408

[Stefano Radaelli <stefano.radaelli21@gmail.com>]

From: Stefano Radaelli <stefano.r@variscite.com>

RGB enable pin, labeled as RGBSEL, is a board-level enable signal on
the Sonata carrier board.

The two PCA6408 GPIO expanders depend on this signal being asserted, so
model it as a fixed regulator and use it as their vcc-supply.

Signed-off-by: Stefano Radaelli <stefano.r@variscite.com>
---
v1->v2:
 - Fixed commit message and RGB pin references.

 arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts b/arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts
index afa39dab240a..3f0fd321d95f 100644
--- a/arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts
+++ b/arch/arm64/boot/dts/freescale/imx91-var-dart-sonata.dts
@@ -90,6 +90,13 @@ reg_vref_1v8: regulator-adc-vref {
 		regulator-max-microvolt = <1800000>;
 	};
 
+	reg_rgb_sel: regulator-rgb-enable {
+		compatible = "regulator-fixed";
+		regulator-name = "RGBSEL";
+		gpio = <&pca9534 7 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
+
 	reg_usdhc2_vmmc: regulator-vmmc-usdhc2 {
 		compatible = "regulator-fixed";
 		pinctrl-names = "default";
@@ -195,6 +202,7 @@ pca6408_1: gpio@20 {
 		#gpio-cells = <2>;
 		interrupt-parent = <&gpio1>;
 		interrupts = <10 IRQ_TYPE_LEVEL_LOW>;
+		vcc-supply = <&reg_rgb_sel>;
 	};
 
 	pca6408_2: gpio@21 {
@@ -204,6 +212,7 @@ pca6408_2: gpio@21 {
 		#gpio-cells = <2>;
 		interrupt-parent = <&gpio1>;
 		interrupts = <10 IRQ_TYPE_LEVEL_LOW>;
+		vcc-supply = <&reg_rgb_sel>;
 	};
 
 	pca9534: gpio@22 {
-- 
2.47.3