[PATCH v2 12/12] arm64: dts: allwinner: rg35xx: Enable LCD output

[Ryan Walklin <ryan@testtoast.com>]

The RG35XX has a 640x480 RGB/SPI LCD panel, supported by the SoC display
pipeline and an NV3052C controller. The H616 SOC's GPIO bank D contains
the muxed display pins for RGB and LVDS output support.

The backlight for this device is not modelled as the PWM driver for the
H616 is not yet implemented.

Enable the display engine and LCD timing controller, configure the
panel, and add a fixed 3.3v GPIO-controlled regulator for the panel, and
a VCC supply for the display pins as per the other GPIO banks.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Tested-by: Philippe Simons <simons.philippe@gmail.com>
Signed-off-by: Ryan Walklin <ryan@testtoast.com>

Changelog v1..v2:
- Remove GPIO backlight node.
---
 .../sun50i-h700-anbernic-rg35xx-2024.dts      | 56 +++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-h700-anbernic-rg35xx-2024.dts b/arch/arm64/boot/dts/allwinner/sun50i-h700-anbernic-rg35xx-2024.dts
index 1a750c5f6fac..7d1da4463adf 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-h700-anbernic-rg35xx-2024.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-h700-anbernic-rg35xx-2024.dts
@@ -181,6 +181,49 @@ reg_vcc5v: regulator-vcc5v { /* USB-C power input */
 		regulator-min-microvolt = <5000000>;
 		regulator-max-microvolt = <5000000>;
 	};
+
+	reg_lcd: regulator-gpio-lcd-vdd {
+		compatible = "regulator-fixed";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		regulator-name = "vdd-lcd";
+		gpio = <&pio 8 15 GPIO_ACTIVE_HIGH>; // PI15
+		enable-active-high;
+	};
+
+	spi_lcd: spi {
+		compatible = "spi-gpio";
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		sck-gpios = <&pio 8 9 GPIO_ACTIVE_HIGH>; // PI9
+		mosi-gpios = <&pio 8 10 GPIO_ACTIVE_HIGH>; // PI10
+		cs-gpios = <&pio 8 8 GPIO_ACTIVE_HIGH>; // PI8
+		num-chipselects = <1>;
+
+		panel: panel@0 {
+			compatible = "anbernic,rg35xx-plus-panel";
+
+			reg = <0>;
+
+			spi-max-frequency = <3125000>;
+			spi-3wire;
+
+			reset-gpios = <&pio 8 14 GPIO_ACTIVE_LOW>; // PI14
+
+			power-supply = <&reg_lcd>;
+
+			pinctrl-0 = <&lcd0_rgb888_pins>;
+			pinctrl-names = "default";
+
+			port {
+				panel_in_rgb: endpoint {
+					remote-endpoint = <&tcon_lcd0_out_lcd>;
+				};
+			};
+		};
+	};
 };
 
 &codec {
@@ -196,6 +239,10 @@ &cpu0 {
 	cpu-supply = <&reg_dcdc1>;
 };
 
+&de {
+	status = "okay";
+};
+
 &ehci0 {
 	status = "okay";
 };
@@ -220,6 +267,7 @@ &ohci0 {
 &pio {
 	vcc-pa-supply = <&reg_cldo3>;
 	vcc-pc-supply = <&reg_cldo3>;
+	vcc-pd-supply = <&reg_cldo3>;
 	vcc-pe-supply = <&reg_cldo3>;
 	vcc-pf-supply = <&reg_cldo3>;
 	vcc-pg-supply = <&reg_aldo4>;
@@ -379,3 +427,11 @@ &usbotg {
 &usbphy {
 	status = "okay";
 };
+
+&tcon_lcd0 {
+	status = "okay";
+};
+
+&tcon_lcd0_out_lcd {
+	remote-endpoint = <&panel_in_rgb>;
+};
-- 
2.50.1