tests: drivers: spi: esp32h2: Add testcase

Add SPI testcase for ESP32-H2.

Signed-off-by: Raffael Rostagno <[email protected]>

Author: Raffael Rostagno

tests/drivers/spi/spi_loopback/socs/esp32h2.conf

@@ -0,0 +1,3 @@
+CONFIG_SPI_ESP32_INTERRUPT=y
+CONFIG_HEAP_MEM_POOL_SIZE=32768
+CONFIG_DMA=y

tests/drivers/spi/spi_loopback/socs/esp32h2.overlay

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2025 Espressif Systems (Shanghai) Co., Ltd.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	spim2_loopback: spim2_loopback {
+		group1 {
+			pinmux = <SPIM2_MISO_GPIO10>;
+			output-enable; /* Enable internal loopback */
+		};
+		group2 {
+			pinmux = <SPIM2_MOSI_GPIO10>;
+			input-enable; /* Enable internal loopback */
+		};
+		group3 {
+			pinmux = <SPIM2_SCLK_GPIO11>,
+				<SPIM2_CSEL_GPIO12>;
+		};
+	};
+};
+
+&spi2 {
+	slow@0 {
+		compatible = "test-spi-loopback-slow";
+		reg = <0>;
+		spi-max-frequency = <500000>;
+	};
+	fast@0 {
+		compatible = "test-spi-loopback-fast";
+		reg = <0>;
+		spi-max-frequency = <16000000>;
+	};
+};
+
+&spi2 {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	dma-enabled;
+	pinctrl-0 = <&spim2_loopback>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	dmas = <&dma 0>, <&dma 1>;
+	dma-names = "rx", "tx";
+};
+
+&dma {
+	status = "okay";
+};