boards: Round Display for Xiao

Added the Round Display for Xiao boards as a shield.
Added a xiao_adc node to Xiao board dtsi files.

Signed-off-by: Nicolas Goualard <nicolas.goualard@sfr.fr>

boards/seeed/seeeduino_xiao/seeed_xiao_connector.dtsi

@@ -30,3 +30,4 @@ xiao_spi: &sercom0 {};
 xiao_i2c: &sercom2 {};
 xiao_serial: &sercom4 {};
 xiao_dac: &dac0 {};
+xiao_adc: &adc {};

boards/seeed/xiao_ble/seeed_xiao_connector.dtsi

@@ -30,3 +30,4 @@
 xiao_spi: &spi2 {};
 xiao_i2c: &i2c1 {};
 xiao_serial: &uart0 {};
+xiao_adc: &adc {};

boards/seeed/xiao_esp32c3/seeed_xiao_connector.dtsi

@@ -27,3 +27,4 @@
 xiao_spi: &spi2 {};
 xiao_i2c: &i2c0 {};
 xiao_serial: &uart0 {};
+xiao_adc: &adc0 {};

boards/seeed/xiao_esp32s3/seeed_xiao_connector.dtsi

@@ -27,3 +27,4 @@
 xiao_spi: &spi2 {};
 xiao_i2c: &i2c0 {};
 xiao_serial: &uart0 {};
+xiao_adc: &adc0 {};

boards/shields/seeed_xiao_round_display/Kconfig.defconfig

@@ -0,0 +1,23 @@
+# Copyright (c) 2024 Nicolas Goualard <nicolas.goualard@sfr.fr>
+# SPDX-License-Identifier: Apache-2.0
+
+if SHIELD_SEEED_XIAO_ROUND_DISPLAY
+
+if DISPLAY
+
+if LVGL
+
+config INPUT
+	default y
+
+choice LV_COLOR_DEPTH
+	default LV_COLOR_DEPTH_16
+endchoice
+
+config LV_COLOR_16_SWAP
+	default y
+
+endif # LVGL
+endif # DISPLAY
+
+endif # SHIELD_XIAO_ROUND_DISPLAY

boards/shields/seeed_xiao_round_display/Kconfig.shield

@@ -0,0 +1,5 @@
+# Copyright (c) 2024 Nicolas Goualard <nicolas.goualard@sfr.fr>
+# SPDX-License-Identifier: Apache-2.0
+
+config SHIELD_SEEED_XIAO_ROUND_DISPLAY
+	def_bool $(shields_list_contains,seeed_xiao_round_display)

boards/shields/seeed_xiao_round_display/doc/index.rst

@@ -0,0 +1,40 @@
+.. _seeed_xiao_round_display:
+
+Seeed Studio XIAO Round Display
+###############################
+
+Overview
+********
+
+Seeed Studio Round Display for XIAO is an expansion board compatible with all
+XIAO development boards. It features a fully covered touch screen on one side,
+designed as a 39mm disc. It contains onboard RTC, charge chip, TF card slot
+within its compact size, perfect for interactive displays in smart home,
+wearables and more.
+
+More information can be found on `the Getting Started page`_
+
+.. figure:: img/seeed_xiao_round_display.webp
+     :align: center
+     :alt: Seeed Studio XIAO Round Display
+
+     Seeed Studio XIAO Round Display (Credit: Seeed Studio)
+
+Programming
+***********
+
+Set ``-DSHIELD=seeed_xiao_round_display`` when you invoke ``west build``.
+
+LVGL Basic Sample
+=================
+
+For example:
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/subsys/display/lvgl
+   :board: xiao_ble/nrf52840
+   :shield: seeed_xiao_round_display
+   :goals: build
+
+.. _the Getting Started page:
+   https://wiki.seeedstudio.com/get_start_round_display/

boards/shields/seeed_xiao_round_display/seeed_xiao_round_display.overlay

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2024, Nicolas Goualard <nicolas.goualard@sfr.fr>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <freq.h>
+#include <zephyr/dt-bindings/display/panel.h>
+
+/ {
+	chosen {
+		zephyr,display = &gc9a01_xiao_round_display;
+	};
+
+	vbatt {
+		compatible = "voltage-divider";
+		io-channels = <&xiao_adc 0>;
+		output-ohms = <470000>;
+		full-ohms = <940000>;
+	};
+
+	lvgl_pointer {
+		compatible = "zephyr,lvgl-pointer-input";
+		input = <&chsc6x_xiao_round_display>;
+	};
+
+	aliases {
+		rtc = &pcf8563_xiao_round_display;
+	};
+};
+
+&xiao_adc {
+	status = "okay";
+};
+
+/*
+ * xiao_serial uses pins D6 and D7 of the Xiao, which are used respectively to
+ * control the screen backlight and as touch controller interrupt.
+ */
+&xiao_serial {
+	status = "disabled";
+};
+
+&xiao_i2c {
+	clock-frequency = < I2C_BITRATE_FAST >;
+
+	pcf8563_xiao_round_display: pcf8563@51 {
+		status = "okay";
+		compatible = "nxp,pcf8563";
+		reg = <0x51>;
+	};
+
+	chsc6x_xiao_round_display: chsc6x@2e {
+		status = "okay";
+		compatible = "chipsemi,chsc6x";
+		reg = <0x2e>;
+		irq-gpios = <&xiao_d 7 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&xiao_spi {
+	status = "okay";
+	cs-gpios = <&xiao_d 1 GPIO_ACTIVE_LOW>, <&xiao_d 2 GPIO_ACTIVE_LOW>;
+
+	gc9a01_xiao_round_display: gc9a01@0 {
+		status = "okay";
+		compatible = "galaxycore,gc9x01x";
+		reg = <0>;
+		spi-max-frequency = <DT_FREQ_M(100)>;
+		cmd-data-gpios = <&xiao_d 3 GPIO_ACTIVE_HIGH>;
+		pixel-format = <PANEL_PIXEL_FORMAT_RGB_565>;
+		width = <240>;
+		height = <240>;
+		display-inversion;
+	};
+
+	sdhc_xiao_round_display: sdhc@1 {
+		compatible = "zephyr,sdhc-spi-slot";
+		reg = <1>;
+		status = "okay";
+		mmc {
+			compatible = "zephyr,sdmmc-disk";
+			status = "okay";
+		};
+		spi-max-frequency = <DT_FREQ_M(24)>;
+	};
+};

samples/subsys/display/lvgl/README.rst

@@ -36,11 +36,12 @@ Requirements
 ************
 
 Display shield and a board which provides a configuration
-for Arduino connectors, for example:
+for corresponding connectors, for example:
 
 - :ref:`adafruit_2_8_tft_touch_v2` and :ref:`nrf52840dk_nrf52840`
 - :ref:`buydisplay_2_8_tft_touch_arduino` and :ref:`nrf52840dk_nrf52840`
 - :ref:`ssd1306_128_shield` and :ref:`frdm_k64f`
+- :ref:`seeed_xiao_round_display` and :ref:`xiao_ble`
 
 or a board with an integrated display: