boards: st: stm32n6570_dk: add display support

Add support of Rockchip RK050HR18C 800x480 RGB 24bits
panel connected on LTDC display parallel interface of
STM32N6570-DK board.

Signed-off-by: Hugues Fruchet <[email protected]>

Author: hfruchet-st

boards/st/stm32n6570_dk/Kconfig.defconfig

@@ -12,4 +12,13 @@ config NET_L2_ETHERNET
 
 endif # NETWORKING
 
+if DISPLAY
+
+# MEMC needs to be enabled in order to store
+# display frame buffer to external PSRAM
+config MEMC
+	default y
+
+endif # DISPLAY
+
 endif # BOARD_STM32N6570_DK

boards/st/stm32n6570_dk/stm32n6570_dk_common.dtsi

@@ -6,8 +6,10 @@
 
 #include <st/n6/stm32n657X0.dtsi>
 #include <st/n6/stm32n657x0hxq-pinctrl.dtsi>
+#include "zephyr/dt-bindings/display/panel.h"
 #include <zephyr/dt-bindings/flash_controller/xspi.h>
 #include <zephyr/dt-bindings/input/input-event-codes.h>
+#include <zephyr/dt-bindings/video/video-interfaces.h>
 #include "arduino_r3_connector.dtsi"
 
 / {
@@ -16,6 +18,7 @@
 		zephyr,shell-uart = &usart1;
 		zephyr,sram = &axisram2;
 		zephyr,canbus = &fdcan1;
+		zephyr,display = &ltdc;
 		spi-flash0 = &mx66uw1g45g;
 	};
 
@@ -74,6 +77,15 @@
 	status = "okay";
 };
 
+&pll4 {
+	clocks = <&clk_hsi>;
+	div-m = <4>;
+	mul-n = <75>;
+	div-p1 = <1>;
+	div-p2 = <1>;
+	status = "okay";
+};
+
 &ic1 {
 	pll-src = <1>;
 	ic-div = <2>;
@@ -104,6 +116,12 @@
 	status = "okay";
 };
 
+&ic16 {
+	pll-src = <4>;
+	ic-div = <60>;
+	status = "okay";
+};
+
 &perck {
 	clocks = <&rcc STM32_SRC_HSI PER_SEL(0)>;
 	status = "okay";
@@ -288,3 +306,40 @@ zephyr_udc0: &usbotg_hs1 {
 		reg = <0x0>;
 	};
 };
+
+&ltdc {
+	pinctrl-0 = <&ltdc_r0_pg0 &ltdc_r1_pd9 &ltdc_r2_pd15 &ltdc_r3_pb4
+			&ltdc_r4_ph4 &ltdc_r5_pa15 &ltdc_r6_pg11 &ltdc_r7_pd8
+			&ltdc_g0_pg12 &ltdc_g1_pg1 &ltdc_g2_pa1 &ltdc_g3_pa0
+			&ltdc_g4_pb15 &ltdc_g5_pb12 &ltdc_g6_pb11 &ltdc_g7_pg8
+			&ltdc_b0_pg15 &ltdc_b1_pa7 &ltdc_b2_pb2 &ltdc_b3_pg6
+			&ltdc_b4_ph3 &ltdc_b5_ph6 &ltdc_b6_pa8 &ltdc_b7_pa2
+			&ltdc_de_pg13 &ltdc_clk_pb13 &ltdc_hsync_pb14 &ltdc_vsync_pe11>;
+	pinctrl-names = "default";
+	disp-on-gpios = <&gpioq 3 GPIO_ACTIVE_HIGH>;
+	bl-ctrl-gpios = <&gpioq 6 GPIO_ACTIVE_HIGH>;
+
+	ext-sdram = <&psram>;
+
+	status = "okay";
+
+	width = <800>;
+	height = <480>;
+	pixel-format = <PANEL_PIXEL_FORMAT_RGB_565>;
+	display-timings {
+		compatible = "zephyr,panel-timing";
+		de-active = <0>;
+		pixelclk-active = <0>;
+		hsync-active = <0>;
+		vsync-active = <0>;
+		hsync-len = <4>;
+		vsync-len = <4>;
+		hback-porch = <8>;
+		vback-porch = <8>;
+		hfront-porch = <8>;
+		vfront-porch = <8>;
+	};
+	def-back-color-red = <0xFF>;
+	def-back-color-green = <0xFF>;
+	def-back-color-blue = <0xFF>;
+};