boards: adafruit: add initial support esp32s3_feather_tft_reverse

The Adafruit Feather ESP32S3 TFT Reverse is a development board in the
Feather standard layout, sharing peripheral placement with other devices
labeled as Feathers or FeatherWings. The board is equipped with an
ESP32-S3 mini module, a fuel gauge, a USB-C and Qwiic/STEMMA-QT connector.
This variant additionally comes with a 240x135 pixel IPS TFT color display
on the backside of the boards and with 3 buttons.

Signed-off-by: Philipp Steiner <[email protected]>

Author: DBS06

boards/adafruit/feather_esp32s3_tft_reverse/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+zephyr_library_sources(board.c)

boards/adafruit/feather_esp32s3_tft_reverse/Kconfig

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+# Adafruit Feather ESP32S3 board configuration
+
+# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+# Copyright (c) 2024 Leon Rinkel <[email protected]>
+# Copyright (c) 2025 Philipp Steiner <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+config HEAP_MEM_POOL_ADD_SIZE_BOARD
+	int
+	default 4096 if BOARD_ADAFRUIT_FEATHER_ESP32S3_TFT_REVERSE_ESP32S3_PROCPU
+	default 256 if BOARD_ADAFRUIT_FEATHER_ESP32S3_TFT_REVERSE_ESP32S3_APPCPU

boards/adafruit/feather_esp32s3_tft_reverse/Kconfig.adafruit_feather_esp32s3_tft_reverse

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+# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+# Copyright (c) 2024 Leon Rinkel <[email protected]>
+# Copyright (c) 2025 Philipp Steiner <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_ADAFRUIT_FEATHER_ESP32S3_TFT_REVERSE
+	select SOC_ESP32S3_WROOM_N8
+	select SOC_ESP32S3_PROCPU if BOARD_ADAFRUIT_FEATHER_ESP32S3_TFT_REVERSE_ESP32S3_PROCPU
+	select SOC_ESP32S3_APPCPU if BOARD_ADAFRUIT_FEATHER_ESP32S3_TFT_REVERSE_ESP32S3_APPCPU

boards/adafruit/feather_esp32s3_tft_reverse/Kconfig.defconfig

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+# Copyright (c) 2024 Leon Rinkel <[email protected]>
+# Copyright (c) 2025 Philipp Steiner <[email protected]>
+# SPDX-License-Identifier: Apache-2.0
+
+if BOARD_ADAFRUIT_FEATHER_ESP32S3_TFT_REVERSE_ESP32S3_PROCPU
+
+if DISPLAY
+
+config BOARD_ADAFRUIT_FEATHER_ESP32S3_TFT_REVERSE
+	select BOARD_LATE_INIT_HOOK
+
+choice ST7789V_PIXEL_FORMAT
+	default ST7789V_RGB565
+endchoice
+
+if LVGL
+
+config LV_Z_BITS_PER_PIXEL
+	default 16
+
+choice LV_COLOR_DEPTH
+	default LV_COLOR_DEPTH_16
+endchoice
+
+config LV_COLOR_16_SWAP
+	default y
+
+endif # LVGL
+
+endif # DISPLAY
+
+endif # BOARD_ADAFRUIT_FEATHER_ESP32S3_TFT_REVERSE_ESP32S3_PROCPU

boards/adafruit/feather_esp32s3_tft_reverse/Kconfig.sysbuild

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+# Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+# SPDX-License-Identifier: Apache-2.0
+
+choice BOOTLOADER
+	default BOOTLOADER_MCUBOOT
+endchoice
+
+choice BOOT_SIGNATURE_TYPE
+	default BOOT_SIGNATURE_TYPE_NONE
+endchoice

boards/adafruit/feather_esp32s3_tft_reverse/adafruit_feather_esp32s3_tft_reverse-pinctrl.dtsi

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+/*
+ * Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+ * Copyright (c) 2024 Leon Rinkel <[email protected]>
+ * Copyright (c) 2025 Philipp Steiner <[email protected]>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/pinctrl/esp-pinctrl-common.h>
+#include <dt-bindings/pinctrl/esp32s3-pinctrl.h>
+#include <zephyr/dt-bindings/pinctrl/esp32s3-gpio-sigmap.h>
+
+&pinctrl {
+	/*  Debug TX (DBG) - This is the hardware UART debug pin */
+	uart0_default: uart0_default {
+		group1 {
+			pinmux = <UART0_TX_GPIO43>;
+			output-high;
+		};
+		group2 {
+			pinmux = <UART0_RX_GPIO44>;
+			bias-pull-up;
+		};
+	};
+
+	uart1_default: uart1_default {
+		group1 {
+			pinmux = <UART1_TX_GPIO39>;
+			output-high;
+		};
+		group2 {
+			pinmux = <UART1_RX_GPIO38>;
+			bias-pull-up;
+		};
+	};
+
+	i2c0_default: i2c0_default {
+		group1 {
+			pinmux = <I2C0_SDA_GPIO3>,
+				 <I2C0_SCL_GPIO4>;
+			drive-open-drain;
+			output-high;
+		};
+	};
+
+	spim2_default: spim2_default {
+		group1 {
+			pinmux = <SPIM2_MISO_GPIO37>,
+				 <SPIM2_SCLK_GPIO36>,
+				 <SPIM2_CSEL_GPIO42>;
+		};
+		group2 {
+			pinmux = <SPIM2_MOSI_GPIO35>;
+			output-low;
+		};
+	};
+
+	spim3_ws2812_led: spim3_ws2812_led {
+		group1 {
+			pinmux = <SPIM3_MOSI_GPIO33>;
+		};
+	};
+
+	twai_default: twai_default {
+		group1 {
+			pinmux = <TWAI_TX_GPIO5>,
+				 <TWAI_RX_GPIO6>;
+		};
+	};
+};

boards/adafruit/feather_esp32s3_tft_reverse/adafruit_feather_esp32s3_tft_reverse_appcpu.dts

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+/*
+ * Copyright (c) 2024 Espressif Systems (Shanghai) Co., Ltd.
+ * Copyright (c) 2024 Leon Rinkel <[email protected]>
+ * Copyright (c) 2025 Philipp Steiner <[email protected]>
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+/dts-v1/;
+
+#include <espressif/esp32s3/esp32s3_wroom_n4r2.dtsi>
+#include <espressif/partitions_0x0_amp.dtsi>
+#include "adafruit_feather_esp32s3_tft_reverse-pinctrl.dtsi"
+
+/ {
+	model = "Adafruit Feather ESP32S3 TFT Reverse APPCPU";
+	compatible = "adafruit,feather_esp32s3_tft_reverse", "espressif,esp32s3";
+
+	chosen {
+		zephyr,sram = &sram1;
+		zephyr,ipc_shm = &shm0;
+		zephyr,ipc = &ipm0;
+		zephyr,flash = &flash0;
+		zephyr,code-partition = &slot0_appcpu_partition;
+	};
+};
+
+&trng0 {
+	status = "okay";
+};
+
+&ipm0 {
+	status = "okay";
+};

boards/adafruit/feather_esp32s3_tft_reverse/adafruit_feather_esp32s3_tft_reverse_appcpu.yaml

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+identifier: adafruit_feather_esp32s3_tft_reverse/esp32s3/appcpu
+name: Adafruit Feather ESP32-S3 TFT Reverse APPCPU
+type: mcu
+arch: xtensa
+toolchain:
+  - zephyr
+supported:
+  - uart
+testing:
+  ignore_tags:
+    - net
+    - bluetooth
+    - flash
+    - cpp
+    - posix
+    - watchdog
+    - logging
+    - kernel
+    - pm
+    - gpio
+    - crypto
+    - eeprom
+    - heap
+    - cmsis_rtos
+    - jwt
+    - zdsp
+vendor: adafruit

boards/adafruit/feather_esp32s3_tft_reverse/adafruit_feather_esp32s3_tft_reverse_appcpu_defconfig

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+# SPDX-License-Identifier: Apache-2.0
+
+CONFIG_MAIN_STACK_SIZE=2048
+CONFIG_CLOCK_CONTROL=y