boards: shields: st: enable the touch input on st_lcd_dsi_mb1835

Add devicetree and configuration for the touch controller on
STM32U5G9J-DK1 and st_lcd_dsi_mb1835 shield.

Signed-off-by: Charles Dias <[email protected]>

Author: CharlesDias

boards/shields/st_lcd_dsi_mb1835/Kconfig.defconfig

@@ -5,6 +5,9 @@ if SHIELD_ST_LCD_DSI_MB1835
 
 orsource "boards/*.defconfig"
 
+config INPUT
+	default y if LVGL
+
 if LVGL
 
 config LV_Z_BITS_PER_PIXEL

boards/shields/st_lcd_dsi_mb1835/doc/index.rst

@@ -116,6 +116,19 @@ Set ``--shield "st_lcd_dsi_mb1835"`` when you invoke ``west build``. For example
    :shield: st_lcd_dsi_mb1835
    :goals: build
 
+You can test both the display and the capacitive touch using the
+``samples/subsys/input/draw_touch_events`` sample:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/subsys/input/draw_touch_events
+   :board: stm32u5g9j_dk1
+   :shield: st_lcd_dsi_mb1835
+   :goals: build
+
+This sample renders a cross that follows your finger and is a quick way to
+verify that the panel, LTDC, and touch controller are wired and configured
+correctly on STM32U5G9J-DK1 with this shield.
+
 References
 **********
 

boards/shields/st_lcd_dsi_mb1835/st_lcd_dsi_mb1835.overlay

@@ -9,6 +9,12 @@
 / {
 	chosen {
 		zephyr,display = &zephyr_lcd_controller;
+		zephyr,touch = &st1633i;
+	};
+
+	lvgl_pointer {
+		compatible = "zephyr,lvgl-pointer-input";
+		input = <&st1633i>;
 	};
 };
 
@@ -111,3 +117,12 @@
 		vfront-porch = <50>;
 	};
 };
+
+&qsh_030_i2c {
+	st1633i: st1633i@70 {
+		compatible = "sitronix,cf1133";
+		reg = <0x70>;
+		int-gpios = <&dsi_lcd_qsh_030 4 GPIO_ACTIVE_LOW>;
+		status = "okay";
+	};
+};

boards/st/stm32u5g9j_dk1/doc/index.rst

@@ -140,6 +140,22 @@ Here is an example for the :zephyr:code-sample:`blinky` application.
    :goals: debug
 
 
+Using the ST LCD DSI MB1835 shield
+**********************************
+
+The :ref:`st_lcd_dsi_mb1835` shield provides a 480x480 round LCD panel with
+capacitive touch for this board via MIPI DSI and I2C. You can exercise both
+display and touch using the :zephyr:code-sample:`draw_touch_events` sample:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/subsys/input/draw_touch_events
+   :board: stm32u5g9j_dk1
+   :shield: st_lcd_dsi_mb1835
+   :goals: build flash
+
+See the shield documentation for details: :ref:`st_lcd_dsi_mb1835`.
+
+
 .. _STM32U5G9J-DK1 website:
    https://www.st.com/en/evaluation-tools/stm32u5g9j-dk1.html
 

boards/st/stm32u5g9j_dk1/stm32u5g9j_dk1.dts

@@ -311,6 +311,13 @@ zephyr_udc0: &usbotg_hs {
 	status = "okay";
 };
 
+qsh_030_i2c: &i2c5 {
+	pinctrl-0 = <&i2c5_scl_ph5 &i2c5_sda_ph4>;
+	pinctrl-names = "default";
+	clock-frequency = <I2C_BITRATE_FAST>;
+	status = "okay";
+};
+
 /* alias used by display shields */
 zephyr_mipi_dsi: &mipi_dsi {};