samples: led_ws2812: ESP32 support

Add overlays for esp32s2, esp32s3, esp32c3 based boards, which
has RGB led assembled. Those boards are capable of driving the
RGB led using SPI. The default MOSI idle level is different
to how DI driver expect it to be.

Signed-off-by: Marek Matej <[email protected]>

Author: Marek Matej

samples/drivers/led_ws2812/boards/esp32c3_devkitm.conf

@@ -0,0 +1,2 @@
+CONFIG_WS2812_STRIP_SPI=y
+CONFIG_SPI=y

samples/drivers/led_ws2812/boards/esp32c3_devkitm.overlay

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/led/led.h>
+
+&spi2 {
+	/* Workaround to support WS2812 driver */
+	line-idle-low;
+
+        led_strip: ws2812@0 {
+                compatible = "worldsemi,ws2812-spi";
+
+                /* SPI */
+                reg = <0>; /* ignored, but necessary for SPI bindings */
+                spi-max-frequency = <6400000>;
+
+                /* WS2812 */
+                chain-length = <1>; /* arbitrary; change at will */
+                spi-cpha;
+                spi-one-frame = <0xf0>; /* 11110000: 625 ns high and 625 ns low */
+                spi-zero-frame = <0xc0>; /* 11000000: 312.5 ns high and 937.5 ns low */
+                color-mapping = <LED_COLOR_ID_GREEN
+                                 LED_COLOR_ID_RED
+                                 LED_COLOR_ID_BLUE>;
+        };
+};
+
+&pinctrl {
+	spim2_default: spim2_default {
+		group2 {
+			pinmux = <SPIM2_MOSI_GPIO8>;
+		};
+	};
+};
+
+/ {
+        aliases {
+                led-strip = &led_strip;
+        };
+};

samples/drivers/led_ws2812/boards/esp32s2_saola.conf

@@ -0,0 +1,2 @@
+CONFIG_WS2812_STRIP_SPI=y
+CONFIG_SPI=y

samples/drivers/led_ws2812/boards/esp32s2_saola.overlay

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/led/led.h>
+
+&spi3 {
+	/* Workaround to support WS2812 driver */
+	line-idle-low;
+
+        led_strip: ws2812@0 {
+                compatible = "worldsemi,ws2812-spi";
+
+                /* SPI */
+                reg = <0>; /* ignored, but necessary for SPI bindings */
+                spi-max-frequency = <6400000>;
+
+                /* WS2812 */
+                chain-length = <1>; /* arbitrary; change at will */
+                spi-cpha;
+                spi-one-frame = <0xf0>; /* 11110000: 625 ns high and 625 ns low */
+                spi-zero-frame = <0xc0>; /* 11000000: 312.5 ns high and 937.5 ns low */
+                color-mapping = <LED_COLOR_ID_GREEN
+                                 LED_COLOR_ID_RED
+                                 LED_COLOR_ID_BLUE>;
+        };
+};
+
+&pinctrl {
+	spim3_default: spim3_default {
+		group2 {
+			pinmux = <SPIM3_MOSI_GPIO18>;
+		};
+	};
+};
+
+/ {
+        aliases {
+                led-strip = &led_strip;
+        };
+};

samples/drivers/led_ws2812/boards/esp32s3_devkitm.conf

@@ -0,0 +1,2 @@
+CONFIG_WS2812_STRIP_SPI=y
+CONFIG_SPI=y

samples/drivers/led_ws2812/boards/esp32s3_devkitm.overlay

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2022 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/led/led.h>
+
+&spi3 {
+	/* Workaround to support WS2812 driver */
+	line-idle-low;
+
+        led_strip: ws2812@0 {
+                compatible = "worldsemi,ws2812-spi";
+
+                /* SPI */
+                reg = <0>; /* ignored, but necessary for SPI bindings */
+                spi-max-frequency = <6400000>;
+
+                /* WS2812 */
+                chain-length = <1>; /* arbitrary; change at will */
+                spi-cpha;
+                spi-one-frame = <0xf0>; /* 11110000: 625 ns high and 625 ns low */
+                spi-zero-frame = <0xc0>; /* 11000000: 312.5 ns high and 937.5 ns low */
+                color-mapping = <LED_COLOR_ID_GREEN
+                                 LED_COLOR_ID_RED
+                                 LED_COLOR_ID_BLUE>;
+        };
+};
+
+&pinctrl {
+	spim3_default: spim3_default {
+		group2 {
+			pinmux = <SPIM3_MOSI_GPIO48>;
+		};
+	};
+};
+
+/ {
+        aliases {
+                led-strip = &led_strip;
+        };
+};