arm64: dts: mediatek: mt7988a-bpi-r4: configure spi-nodes

Configure and enable SPI nodes on Bananapi R4 board.

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20250516180147.10416-13-linux@fw-web.de
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

Author: frank-w

arch/arm64/boot/dts/mediatek/mt7988a-bananapi-bpi-r4.dtsi

@@ -401,6 +401,38 @@
 	status = "okay";
 };
 
+&spi0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&spi0_flash_pins>;
+	status = "okay";
+
+	spi_nand: flash@0 {
+		compatible = "spi-nand";
+		reg = <0>;
+		spi-max-frequency = <52000000>;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
+	};
+};
+
+&spi1 {
+	status = "okay";
+};
+
+&spi_nand {
+	partitions {
+		compatible = "fixed-partitions";
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		partition@0 {
+			label = "bl2";
+			reg = <0x0 0x200000>;
+			read-only;
+		};
+	};
+};
+
 &ssusb1 {
 	status = "okay";
 };