riscv: dts: spacemit: enable eMMC for K1 SoC

Enable eMMC support for SpacemiT K1 SoC, successfully tested on
Bananapi-F3 board which shipped with a 16GB eMMC chip - KLMAG1JETD-B041.

Link: https://lore.kernel.org/r/20250523-22-k1-sdhci-v1-1-6e0adddf7494@gentoo.org
Signed-off-by: Yixun Lan <dlan@gentoo.org>

Author: dlan17

arch/riscv/boot/dts/spacemit/k1-bananapi-f3.dts

@@ -30,6 +30,16 @@
 	};
 };
 
+&emmc {
+	bus-width = <8>;
+	mmc-hs400-1_8v;
+	mmc-hs400-enhanced-strobe;
+	non-removable;
+	no-sd;
+	no-sdio;
+	status = "okay";
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_2_cfg>;

arch/riscv/boot/dts/spacemit/k1.dtsi

@@ -511,6 +511,15 @@
 			#clock-cells = <1>;
 		};
 
+		emmc: mmc@d4281000 {
+			compatible = "spacemit,k1-sdhci";
+			reg = <0x0 0xd4281000 0x0 0x200>;
+			clocks = <&syscon_apmu CLK_SDH_AXI>, <&syscon_apmu CLK_SDH2>;
+			clock-names = "core", "io";
+			interrupts = <101>;
+			status = "disabled";
+		};
+
 		syscon_apmu: system-controller@d4282800 {
 			compatible = "spacemit,k1-syscon-apmu";
 			reg = <0x0 0xd4282800 0x0 0x400>;