arm64: dts: rockchip: Add NOR flash to ODROID-M1

Enable the Rockchip Serial Flash Controller for the ODROID-M1 and add
the corresponding SPI NOR flash entry. The SFC is used in dual I/O mode
and not quad I/O mode, as the FSPI_D2 pin is shared with the EMMC_RSTn
pin.

The partitions addresses and sizes are taken from the ODROID-M1
Partition Table page on the ODROID wiki.
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Tested-by: Dan Johansen <strit@manjaro.org>
Link: https://lore.kernel.org/r/20220930051246.391614-5-aurelien@aurel32.netSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm64/boot/dts/rockchip/rk3568-odroid-m1.dts

@@ -351,6 +351,20 @@ rgmii_phy0: ethernet-phy@0 {
 };
 
 &pinctrl {
+	fspi {
+		fspi_dual_io_pins: fspi-dual-io-pins {
+			rockchip,pins =
+				/* fspi_clk */
+				<1 RK_PD0 1 &pcfg_pull_none>,
+				/* fspi_cs0n */
+				<1 RK_PD3 1 &pcfg_pull_none>,
+				/* fspi_d0 */
+				<1 RK_PD1 1 &pcfg_pull_none>,
+				/* fspi_d1 */
+				<1 RK_PD2 1 &pcfg_pull_none>;
+		};
+	};
+
 	leds {
 		led_power_pin: led-power-pin {
 			rockchip,pins = <0 RK_PC6 RK_FUNC_GPIO &pcfg_pull_none>;
@@ -409,6 +423,50 @@ &sdmmc0 {
 	status = "okay";
 };
 
+&sfc {
+	/* Dual I/O mode as the D2 pin conflicts with the eMMC */
+	pinctrl-0 = <&fspi_dual_io_pins>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		spi-max-frequency = <100000000>;
+		spi-rx-bus-width = <2>;
+		spi-tx-bus-width = <1>;
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			partition@0 {
+				label = "SPL";
+				reg = <0x0 0xe0000>;
+			};
+			partition@e0000 {
+				label = "U-Boot Env";
+				reg = <0xe0000 0x20000>;
+			};
+			partition@100000 {
+				label = "U-Boot";
+				reg = <0x100000 0x200000>;
+			};
+			partition@300000 {
+				label = "splash";
+				reg = <0x300000 0x100000>;
+			};
+			partition@400000 {
+				label = "Filesystem";
+				reg = <0x400000 0xc00000>;
+			};
+		};
+	};
+};
+
 &tsadc {
 	rockchip,hw-tshut-mode = <1>;
 	rockchip,hw-tshut-polarity = <0>;