samples: drivers: spi_flash: Add MAX32655 support

Enable spi_flash sample for MAX32655FTHR and MAX32655EVKIT
which have an external Winbond W25Q128jv external flash.

Signed-off-by: Tahsin Mutlugun <[email protected]>
Signed-off-by: Rob Cornall <[email protected]>
Signed-off-by: Yasin Ustuner <[email protected]>

Author: rcornall-adi

boards/adi/max32655evkit/max32655evkit_max32655_m4.dts

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023-2024 Analog Devices, Inc.
+ * Copyright (c) 2023-2025 Analog Devices, Inc.
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -132,3 +132,34 @@
 &rtc_counter {
 	status = "okay";
 };
+
+&spi0_mosi_p0_5 {
+	power-source = <MAX32_VSEL_VDDIOH>;
+};
+
+&spi0_miso_p0_6 {
+	power-source = <MAX32_VSEL_VDDIOH>;
+};
+
+&spi0_sck_p0_7 {
+	power-source = <MAX32_VSEL_VDDIOH>;
+};
+
+&spi0 {
+	status = "okay";
+	pinctrl-0 = <&spi0_mosi_p0_5 &spi0_miso_p0_6 &spi0_sck_p0_7>;
+	pinctrl-names = "default";
+	cs-gpios = <&gpio0 4 (GPIO_ACTIVE_LOW | MAX32_GPIO_VSEL_VDDIOH)>;
+
+	spi0_cs0_flash: w25q128@0 {
+		compatible = "jedec,spi-nor";
+		/* 134217728 bits = 16 Mbytes */
+		size = <0x8000000>;
+		reg = <0>;
+		spi-max-frequency = <10000000>;
+		jedec-id = [ef 40 18];
+		hold-gpios = <&gpio0 9 (GPIO_ACTIVE_LOW | MAX32_GPIO_VSEL_VDDIOH)>;
+		wp-gpios = <&gpio0 8 (GPIO_ACTIVE_HIGH | MAX32_GPIO_VSEL_VDDIOH)>;
+		status = "okay";
+	};
+};

boards/adi/max32655fthr/max32655fthr_max32655_m4.dts

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2023-2024 Analog Devices, Inc.
+ * Copyright (c) 2023-2025 Analog Devices, Inc.
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -161,3 +161,35 @@
 &rtc_counter {
 	status = "okay";
 };
+
+&spi0_mosi_p0_5 {
+	power-source = <MAX32_VSEL_VDDIOH>;
+};
+
+&spi0_miso_p0_6 {
+	power-source = <MAX32_VSEL_VDDIOH>;
+};
+
+&spi0_sck_p0_7 {
+	power-source = <MAX32_VSEL_VDDIOH>;
+};
+
+&spi0 {
+	status = "okay";
+	pinctrl-0 = <&spi0_mosi_p0_5 &spi0_miso_p0_6 &spi0_sck_p0_7>;
+	pinctrl-names = "default";
+	cs-gpios = <&gpio0 4 (GPIO_ACTIVE_LOW | MAX32_GPIO_VSEL_VDDIOH)>,
+		   <&gpio0 11 (GPIO_ACTIVE_LOW | MAX32_GPIO_VSEL_VDDIOH)>;
+
+	spi0_cs1_flash: w25q128jv@1 {
+		compatible = "jedec,spi-nor";
+		/* 134217728 bits = 16 Mbytes */
+		size = <0x8000000>;
+		reg = <1>;
+		spi-max-frequency = <10000000>;
+		jedec-id = [ef 70 18];
+		hold-gpios = <&gpio0 9 (GPIO_ACTIVE_LOW | MAX32_GPIO_VSEL_VDDIOH)>;
+		wp-gpios = <&gpio0 8 (GPIO_ACTIVE_HIGH | MAX32_GPIO_VSEL_VDDIOH)>;
+		status = "okay";
+	};
+};

samples/drivers/spi_flash/boards/max32655evkit_max32655_m4.conf

@@ -0,0 +1,7 @@
+#
+# Copyright (c) 2025 Analog Devices, Inc.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+CONFIG_SPI_MAX32_INTERRUPT=y