arm64: dts: rockchip: add Radxa E24C

- Apparently there's versions with either eMMC or SPI NOR and they share a pin
- From https://github.com/radxa/kernel/blob/linux-6.1-stan-rkr5.1/arch/arm64/boot/dts/rockchip/rk3528-radxa-e24c.dts @8582469f117fdfd5d1ab88fa7e4e15c3b714bf24
- From https://github.com/radxa/kernel/blob/linux-6.1-stan-rkr5.1/arch/arm64/boot/dts/rockchip/rk3528-radxa-e24c-spi.dts @8582469f117fdfd5d1ab88fa7e4e15c3b714bf24

Author: rpardini

arch/arm64/boot/dts/rockchip/Makefile

@@ -113,6 +113,8 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3528-hinlink-ht2.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3566-h96max-v56.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3528-mangopi-m28k.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3528-radxa-e20c.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3528-radxa-e24c.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3528-radxa-e24c-spi.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3528-rock-2a.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3528-rock-2f.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3562-dictpen-test3-v20.dtb

arch/arm64/boot/dts/rockchip/rk3528-radxa-e24c-spi.dts

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
+ * Copyright (c) 2024 Radxa Computer (Shenzhen) Co., Ltd.
+ *
+ */
+
+// From https://github.com/radxa/kernel/blob/linux-6.1-stan-rkr5.1/arch/arm64/boot/dts/rockchip/rk3528-radxa-e24c-spi.dts @8582469f117fdfd5d1ab88fa7e4e15c3b714bf24
+
+/dts-v1/;
+
+#include "rk3528-radxa-e24c.dts"
+
+/ {
+	model = "Radxa E24C SPI";
+	compatible = "radxa,e24c-spi", "radxa,e24c", "radxa,rock-2", "rockchip,rk3528a";
+};
+
+&sfc {
+	status = "okay";
+	max-freq = <50000000>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&fspi_pins &fspi_csn0>;
+	num-cs = <2>;
+
+	spi_flash: spi-flash@0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "jedec,spi-nor";
+		reg = <0x0>;
+		spi-max-frequency = <50000000>;
+		spi-tx-bus-width = <1>;
+		spi-rx-bus-width = <4>;
+		status = "okay";
+
+		partitions {
+			compatible = "fixed-partitions";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			loader@0 {
+				label = "loader";
+				reg = <0x0 0x1000000>;
+			};
+		};
+	};
+};
+
+&sdhci {
+	status = "disabled";
+};