boards: arm: stm32f746g_disco: add support for LTDC

Add LTDC config and pinctrl in board DTS
Modify defconfig so KSCAN and MEMC drivers are enabled if
display is enabled
Update board doc and yaml

Signed-off-by: Tomislav Milkovic <[email protected]>

Author: tmilkovic51

boards/arm/stm32f746g_disco/Kconfig.defconfig

@@ -15,14 +15,29 @@ config NET_L2_ETHERNET
 
 endif # NETWORKING
 
-config I2C
-	default y if KSCAN
+if DISPLAY
+
+config KSCAN
+	default y
+
+# MEMC needs to be enabled in order to store
+# display buffer to external SDRAM connected to FMC
+config MEMC
+	default y
+
+endif # DISPLAY
 
 if KSCAN
 
+config I2C
+	default y
+
 config KSCAN_FT5336
 	default y
 
+config KSCAN_FT5336_INTERRUPT
+	default y
+
 endif # KSCAN
 
 config DISK_DRIVER_SDMMC

boards/arm/stm32f746g_disco/doc/index.rst

@@ -118,6 +118,8 @@ The Zephyr stm32f746g_disco board configuration supports the following hardware
 +-----------+------------+-------------------------------------+
 | FMC       | on-chip    | memc (SDRAM)                        |
 +-----------+------------+-------------------------------------+
+| LTDC      | on-chip    | display                             |
++-----------+------------+-------------------------------------+
 
 Other hardware features are not yet supported on Zephyr porting.
 
@@ -158,6 +160,13 @@ configured as follows
    - NBL0/NBL1 : PE0/PE1
    - SDCLK/SDNWE/SDCKE0/SDNE0 : PG8/PH5/PC3/PH3
 
+- LTDC :
+
+   - R0-R7 : PI15/PJ0/PJ1/PJ2/PJ3/PJ4/PJ5/PJ6
+   - G0-G7 : PJ7/PJ8/PJ9/PJ10/PJ11/PK0/PK1/PK2
+   - B0-B7 : PJ12/PK13/PJ14/PJ15/PK3/PK4/PK5/PK6
+   - DE/CLK/HSYNC/VSYNC : PK7/PI14/PI12/PI13
+
 
 System Clock
 ============

boards/arm/stm32f746g_disco/stm32f746g_disco.dts

@@ -20,6 +20,7 @@
 		zephyr,flash = &flash0;
 		zephyr,dtcm = &dtcm;
 		zephyr,flash-controller = &n25q128a1;
+		zephyr,display = &ltdc;
 	};
 
 	leds {
@@ -233,3 +234,34 @@ zephyr_udc0: &usbotg_fs {
 		};
 	};
 };
+
+&ltdc {
+	pinctrl-0 = <&ltdc_r0_pi15 &ltdc_r1_pj0 &ltdc_r2_pj1 &ltdc_r3_pj2
+		     &ltdc_r4_pj3 &ltdc_r5_pj4 &ltdc_r6_pj5 &ltdc_r7_pj6
+		     &ltdc_g0_pj7 &ltdc_g1_pj8 &ltdc_g2_pj9 &ltdc_g3_pj10
+		     &ltdc_g4_pj11 &ltdc_g5_pk0 &ltdc_g6_pk1 &ltdc_g7_pk2
+		     &ltdc_b0_pe4 &ltdc_b1_pj13 &ltdc_b2_pj14 &ltdc_b3_pj15
+		     &ltdc_b4_pg12 &ltdc_b5_pk4 &ltdc_b6_pk5 &ltdc_b7_pk6
+		     &ltdc_de_pk7 &ltdc_clk_pi14 &ltdc_hsync_pi10 &ltdc_vsync_pi9>;
+	pinctrl-names = "default";
+	disp-on-gpios = <&gpioi 12 GPIO_ACTIVE_HIGH>;
+	bl-ctrl-gpios = <&gpiok 3 GPIO_ACTIVE_HIGH>;
+	ext-sdram = <&sdram1>;
+	status = "okay";
+
+	width = <480>;
+	height = <272>;
+	hsync-pol = <STM32_LTDC_HSPOL_ACTIVE_LOW>;
+	vsync-pol = <STM32_LTDC_VSPOL_ACTIVE_LOW>;
+	de-pol = <STM32_LTDC_DEPOL_ACTIVE_LOW>;
+	pclk-pol = <STM32_LTDC_PCPOL_ACTIVE_LOW>;
+	hsync-duration = <1>;
+	vsync-duration = <10>;
+	hbp-duration = <43>;
+	vbp-duration = <12>;
+	hfp-duration = <8>;
+	vfp-duration = <4>;
+	def-back-color-red = <0xFF>;
+	def-back-color-green = <0xFF>;
+	def-back-color-blue = <0xFF>;
+};

boards/arm/stm32f746g_disco/stm32f746g_disco.yaml

@@ -19,4 +19,5 @@ supported:
   - sdhc
   - usb_device
   - kscan:touch
+  - display
   - memc