arm64: dts: renesas: rzg2lc-smarc-som: Enable serial NOR flash

Enable mt25qu512a flash connected to QSPI0.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20220307192436.13237-2-biju.das.jz@bp.renesas.comSigned-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/rzg2lc-smarc-som.dtsi

@@ -110,6 +110,18 @@ gpio-sd0-pwr-en-hog {
 		line-name = "gpio_sd0_pwr_en";
 	};
 
+	qspi0_pins: qspi0 {
+		qspi0-data {
+			pins = "QSPI0_IO0", "QSPI0_IO1", "QSPI0_IO2", "QSPI0_IO3";
+			power-source = <1800>;
+		};
+
+		qspi0-ctrl {
+			pins = "QSPI0_SPCLK", "QSPI0_SSL", "QSPI_RESET#";
+			power-source = <1800>;
+		};
+	};
+
 	/*
 	 * SD0 device selection is XOR between GPIO_SD0_DEV_SEL and SW1[2]
 	 * The below switch logic can be used to select the device between
@@ -175,6 +187,34 @@ sd0_mux_uhs {
 	};
 };
 
+&sbc {
+	pinctrl-0 = <&qspi0_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	flash@0 {
+		compatible = "micron,mt25qu512a", "jedec,spi-nor";
+		reg = <0>;
+		m25p,fast-read;
+		spi-max-frequency = <50000000>;
+		spi-rx-bus-width = <4>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			boot@0 {
+				reg = <0x00000000 0x2000000>;
+				read-only;
+			};
+			user@2000000 {
+				reg = <0x2000000 0x2000000>;
+			};
+		};
+	};
+};
+
 #if (!SW_SD0_DEV_SEL)
 &sdhi0 {
 	pinctrl-0 = <&sdhi0_pins>;