samples: mbox: Add support for ESP32C6

Add mbox sample support for ESP32C6 HP and LP Core

Signed-off-by: Lucas Tamborrino <lucas.tamborrino@espressif.com>

Author: LucasTambor

samples/drivers/mbox/CMakeLists.txt

@@ -23,6 +23,7 @@ if(CONFIG_BOARD_NRF5340DK_NRF5340_CPUAPP OR
    CONFIG_BOARD_MCX_N9XX_EVK_MCXN947_CPU0 OR
    CONFIG_BOARD_ESP32_DEVKITC_ESP32_PROCPU OR
    CONFIG_BOARD_ESP32S3_DEVKITM_ESP32S3_PROCPU OR
+   CONFIG_BOARD_ESP32C6_DEVKITC_ESP32C6_HPCORE OR
    CONFIG_BOARD_NRF54H20DK_NRF54H20_CPUAPP OR
    CONFIG_BOARD_NRF54H20DK_NRF54H20_CPURAD OR
    CONFIG_BOARD_NRF54L09PDK_NRF54L09_CPUAPP OR

samples/drivers/mbox/Kconfig.sysbuild

@@ -27,5 +27,6 @@ config REMOTE_BOARD
 	default "stm32h747i_disco/stm32h747xx/m4" if $(BOARD) = "stm32h747i_disco"
 	default "esp32_devkitc/esp32/appcpu" if "$(BOARD)${BOARD_QUALIFIERS}" = "esp32_devkitc/esp32/procpu"
 	default "esp32s3_devkitm/esp32s3/appcpu" if "$(BOARD)${BOARD_QUALIFIERS}" = "esp32s3_devkitm/esp32s3/procpu"
+	default "esp32c6_devkitc/esp32c6/lpcore" if "$(BOARD)${BOARD_QUALIFIERS}" = "esp32c6_devkitc/esp32c6/hpcore"
 	default "bl54l15_dvk/nrf54l15/cpuflpr" if "$(BOARD)${BOARD_QUALIFIERS}" = "bl54l15_dvk/nrf54l15/cpuapp"
 	default "bl54l15u_dvk/nrf54l15/cpuflpr" if $(BOARD) = "bl54l15u_dvk"

samples/drivers/mbox/boards/esp32c6_devkitc_hpcore.conf

@@ -0,0 +1,2 @@
+CONFIG_ULP_COPROC_ENABLED=y
+CONFIG_DEBUG_OPTIMIZATIONS=y

samples/drivers/mbox/boards/esp32c6_devkitc_hpcore.overlay

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2025 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,ipc_shm = &shmlp;
+		zephyr,ipc = &mbox0;
+	};
+
+	mbox-consumer {
+		compatible = "vnd,mbox-consumer";
+		mboxes = <&mbox0 0>, <&mbox0 1>;
+		mbox-names = "tx", "rx";
+	};
+};
+
+&mbox0 {
+	status = "okay";
+};
+
+&lp_uart {
+	status = "okay";
+};

samples/drivers/mbox/remote/CMakeLists.txt

@@ -21,6 +21,7 @@ if(CONFIG_BOARD_NRF5340DK_NRF5340_CPUNET OR
    CONFIG_BOARD_MCX_N9XX_EVK_MCXN947_CPU1 OR
    CONFIG_BOARD_ESP32_DEVKITC_ESP32_APPCPU OR
    CONFIG_BOARD_ESP32S3_DEVKITM_ESP32S3_APPCPU OR
+   CONFIG_BOARD_ESP32C6_DEVKITC_ESP32C6_LPCORE OR
    CONFIG_BOARD_NRF54H20DK_NRF54H20_CPUPPR OR
    CONFIG_BOARD_NRF54H20DK_NRF54H20_CPUFLPR OR
    CONFIG_BOARD_NRF54H20DK_NRF54H20_CPUAPP OR

samples/drivers/mbox/remote/boards/esp32c6_devkitc_lpcore.overlay

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2024 Felipe Neves.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	chosen {
+		zephyr,ipc_shm = &shmlp;
+		zephyr,ipc = &mbox0;
+	};
+
+	mbox-consumer {
+		compatible = "vnd,mbox-consumer";
+		mboxes = <&mbox0 1>, <&mbox0 0>;
+		mbox-names = "tx", "rx";
+	};
+};
+
+&mbox0 {
+	status = "okay";
+};
+
+&lp_uart {
+	status = "okay";
+};