From 1e4d99549f00de502fe02b0bbed16327434e2514 Mon Sep 17 00:00:00 2001
From: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Date: Sun, 3 Sep 2023 22:48:49 +0200
Subject: [PATCH] ARM: dts: stm32: support display on stm32f746-disco board

The patch applies the changes from Linux commit 10a970bc3ebfa ("ARM: dts:
stm32: support display on stm32f746-disco board") and removes the same
settings from stm32f746-disco-u-boot.dtsi.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
---
 arch/arm/dts/stm32f746-disco-u-boot.dtsi | 89 ++++++------------------
 arch/arm/dts/stm32f746-disco.dts         | 44 ++++++++++++
 2 files changed, 66 insertions(+), 67 deletions(-)

diff --git a/arch/arm/dts/stm32f746-disco-u-boot.dtsi b/arch/arm/dts/stm32f746-disco-u-boot.dtsi
index 3c2b9fc595..1b42d6cbbc 100644
--- a/arch/arm/dts/stm32f746-disco-u-boot.dtsi
+++ b/arch/arm/dts/stm32f746-disco-u-boot.dtsi
@@ -23,12 +23,6 @@
 		spi0 = &qspi;
 	};
 
-	backlight: backlight {
-		compatible = "gpio-backlight";
-		gpios = <&gpiok 3 0>;
-		status = "okay";
-	};
-
 	button1 {
 		compatible = "st,button1";
 		button-gpio = <&gpioi 11 0>;
@@ -38,37 +32,10 @@
 		compatible = "st,led1";
 		led-gpio = <&gpioi 1 0>;
 	};
-
-	panel-rgb@0 {
-		compatible = "simple-panel";
-		backlight = <&backlight>;
-		enable-gpios = <&gpioi 12 0>;
-		status = "okay";
-
-		display-timings {
-			timing@0 {
-				clock-frequency = <9000000>;
-				hactive = <480>;
-				vactive = <272>;
-				hfront-porch = <2>;
-				hback-porch = <2>;
-				hsync-len = <41>;
-				vfront-porch = <2>;
-				vback-porch = <2>;
-				vsync-len = <10>;
-				hsync-active = <0>;
-				vsync-active = <0>;
-				de-active = <1>;
-				pixelclk-active = <1>;
-			};
-		};
-	};
 };
 
 &ltdc {
 	clocks = <&rcc 0 STM32F7_APB2_CLOCK(LTDC)>;
-	pinctrl-0 = <&ltdc_pins>;
-	status = "okay";
 	bootph-all;
 };
 
@@ -96,6 +63,28 @@
 	};
 };
 
+&panel_rgb {
+	compatible = "simple-panel";
+
+	display-timings {
+		timing@0 {
+			clock-frequency = <9000000>;
+			hactive = <480>;
+			vactive = <272>;
+			hfront-porch = <2>;
+			hback-porch = <2>;
+			hsync-len = <41>;
+			vfront-porch = <2>;
+			vback-porch = <2>;
+			vsync-len = <10>;
+			hsync-active = <0>;
+			vsync-active = <0>;
+			de-active = <1>;
+			pixelclk-active = <1>;
+		};
+	};
+};
+
 &pinctrl {
 	ethernet_mii: mii@0 {
 		pins {
@@ -160,40 +149,6 @@
 		};
 	};
 
-	ltdc_pins: ltdc@0 {
-		pins {
-			pinmux = <STM32_PINMUX('E', 4, AF14)>, /* B0 */
-				 <STM32_PINMUX('G',12, AF9)>,  /* B4 */
-				 <STM32_PINMUX('I', 9, AF14)>, /* VSYNC */
-				 <STM32_PINMUX('I',10, AF14)>, /* HSYNC */
-				 <STM32_PINMUX('I',14, AF14)>, /* CLK */
-				 <STM32_PINMUX('I',15, AF14)>, /* R0 */
-				 <STM32_PINMUX('J', 0, AF14)>, /* R1 */
-				 <STM32_PINMUX('J', 1, AF14)>, /* R2 */
-				 <STM32_PINMUX('J', 2, AF14)>, /* R3 */
-				 <STM32_PINMUX('J', 3, AF14)>, /* R4 */
-				 <STM32_PINMUX('J', 4, AF14)>, /* R5 */
-				 <STM32_PINMUX('J', 5, AF14)>, /* R6 */
-				 <STM32_PINMUX('J', 6, AF14)>, /* R7 */
-				 <STM32_PINMUX('J', 7, AF14)>, /* G0 */
-				 <STM32_PINMUX('J', 8, AF14)>, /* G1 */
-				 <STM32_PINMUX('J', 9, AF14)>, /* G2 */
-				 <STM32_PINMUX('J',10, AF14)>, /* G3 */
-				 <STM32_PINMUX('J',11, AF14)>, /* G4 */
-				 <STM32_PINMUX('J',13, AF14)>, /* B1 */
-				 <STM32_PINMUX('J',14, AF14)>, /* B2 */
-				 <STM32_PINMUX('J',15, AF14)>, /* B3 */
-				 <STM32_PINMUX('K', 0, AF14)>, /* G5 */
-				 <STM32_PINMUX('K', 1, AF14)>, /* G6 */
-				 <STM32_PINMUX('K', 2, AF14)>, /* G7 */
-				 <STM32_PINMUX('K', 4, AF14)>, /* B5 */
-				 <STM32_PINMUX('K', 5, AF14)>, /* B6 */
-				 <STM32_PINMUX('K', 6, AF14)>, /* B7 */
-				 <STM32_PINMUX('K', 7, AF14)>; /* DE */
-			slew-rate = <2>;
-		};
-	};
-
 	qspi_pins: qspi@0 {
 		pins {
 			pinmux = <STM32_PINMUX('B', 2, AF9)>, /* CLK */
diff --git a/arch/arm/dts/stm32f746-disco.dts b/arch/arm/dts/stm32f746-disco.dts
index e1564d69f9..4312751340 100644
--- a/arch/arm/dts/stm32f746-disco.dts
+++ b/arch/arm/dts/stm32f746-disco.dts
@@ -25,6 +25,19 @@
 		reg = <0xC0000000 0x800000>;
 	};
 
+	reserved-memory {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		linux,cma {
+			compatible = "shared-dma-pool";
+			no-map;
+			size = <0x80000>;
+			linux,dma-default;
+		};
+	};
+
 	aliases {
 		serial0 = &usart1;
 	};
@@ -50,6 +63,25 @@
 		regulator-min-microvolt = <3300000>;
 		regulator-max-microvolt = <3300000>;
 	};
+
+	backlight: backlight {
+		compatible = "gpio-backlight";
+		gpios = <&gpiok 3 GPIO_ACTIVE_HIGH>;
+		status = "okay";
+	};
+
+	panel_rgb: panel-rgb {
+		compatible = "rocktech,rk043fn48h";
+		power-supply = <&vcc_3v3>;
+		backlight = <&backlight>;
+		enable-gpios = <&gpioi 12 GPIO_ACTIVE_HIGH>;
+		status = "okay";
+		port {
+			panel_in_rgb: endpoint {
+				remote-endpoint = <&ltdc_out_rgb>;
+			};
+		};
+	};
 };
 
 &clk_hse {
@@ -80,6 +112,18 @@
 	};
 };
 
+&ltdc {
+	pinctrl-0 = <&ltdc_pins_a>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	port {
+		ltdc_out_rgb: endpoint {
+			remote-endpoint = <&panel_in_rgb>;
+		};
+	};
+};
+
 &sdio1 {
 	status = "okay";
 	vmmc-supply = <&vcc_3v3>;
-- 
2.39.5