arm64: dts: renesas: r9a09g056n48-rzv2n-evk: Enable serial NOR FLASH

Enable MT25QU512ABB8E12 FLASH connected to XSPI.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250704140823.163572-4-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Author: prabhakarlad

arch/arm64/boot/dts/renesas/r9a09g056n48-rzv2n-evk.dts

@@ -341,6 +341,18 @@
 			pinmux = <RZV2N_PORT_PINMUX(9, 5, 14)>; /* VBUS */
 		};
 	};
+
+	xspi_pins: xspi0 {
+		ctrl {
+			pins = "XSPI0_RESET0N", "XSPI0_CS0N", "XSPI0_CKP";
+			output-enable;
+		};
+
+		io {
+			pins = "XSPI0_IO0", "XSPI0_IO1", "XSPI0_IO2", "XSPI0_IO3";
+			renesas,output-impedance = <3>;
+		};
+	};
 };
 
 &qextal_clk {
@@ -383,3 +395,46 @@
 &wdt1 {
 	status = "okay";
 };
+
+&xspi {
+	pinctrl-0 = <&xspi_pins>;
+	pinctrl-names = "default";
+	/*
+	 * MT25QU512ABB8E12 flash chip is capable of running at 166MHz
+	 * clock frequency. Set the clock frequency to the maximum 133MHz
+	 * supported by the RZ/V2N SoC.
+	 */
+	assigned-clocks = <&cpg CPG_CORE R9A09G056_SPI_CLK_SPI>;
+	assigned-clock-rates = <133333334>;
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		vcc-supply = <&reg_1p8v>;
+		m25p,fast-read;
+		spi-tx-bus-width = <4>;
+		spi-rx-bus-width = <4>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "bl2";
+				reg = <0x00000000 0x00060000>;
+			};
+
+			partition@60000 {
+				label = "fip";
+				reg = <0x00060000 0x1fa0000>;
+			};
+
+			partition@2000000 {
+				label = "user";
+				reg = <0x2000000 0x2000000>;
+			};
+		};
+	};
+};