[PATCH RFC] riscv: dts: sophgo: add sdcard support for milkv duo

[Jisheng Zhang <jszhang@kernel.org>]

Add sdhci dt node in SoC dtsi and enable it in milkv duo dts.

Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
---
Since cv1800b's clk support isn't in, this patch uses fixed dummy clk
and just RFC, I will send formal patch after clk support is ready.

 .../riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts |  8 ++++++++
 arch/riscv/boot/dts/sophgo/cv18xx.dtsi          | 17 +++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts b/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
index 3af9e34b3bc7..94e64ddce8fa 100644
--- a/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
+++ b/arch/riscv/boot/dts/sophgo/cv1800b-milkv-duo.dts
@@ -33,6 +33,14 @@ &osc {
 	clock-frequency = <25000000>;
 };
 
+&sdhci0 {
+	status = "okay";
+	bus-width = <4>;
+	no-1-8-v;
+	no-mmc;
+	no-sdio;
+};
+
 &uart0 {
 	status = "okay";
 };
diff --git a/arch/riscv/boot/dts/sophgo/cv18xx.dtsi b/arch/riscv/boot/dts/sophgo/cv18xx.dtsi
index 2d6f4a4b1e58..405f4ba18392 100644
--- a/arch/riscv/boot/dts/sophgo/cv18xx.dtsi
+++ b/arch/riscv/boot/dts/sophgo/cv18xx.dtsi
@@ -4,6 +4,7 @@
  * Copyright (C) 2023 Inochi Amaoto <inochiama@outlook.com>
  */
 
+#include <dt-bindings/gpio/gpio.h>
 #include <dt-bindings/interrupt-controller/irq.h>
 
 / {
@@ -45,6 +46,13 @@ osc: oscillator {
 		#clock-cells = <0>;
 	};
 
+	sdhci_clk: sdhci-clock {
+		compatible = "fixed-clock";
+		clock-frequency = <375000000>;
+		clock-output-names = "sdhci_clk";
+		#clock-cells = <0>;
+	};
+
 	soc {
 		compatible = "simple-bus";
 		interrupt-parent = <&plic>;
@@ -175,6 +183,15 @@ uart4: serial@41c0000 {
 			status = "disabled";
 		};
 
+		sdhci0: mmc@4310000 {
+			compatible = "sophgo,cv1800b-dwcmshc";
+			reg = <0x4310000 0x1000>;
+			interrupts = <36 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&sdhci_clk>;
+			clock-names = "core";
+			status = "disabled";
+		};
+
 		plic: interrupt-controller@70000000 {
 			reg = <0x70000000 0x4000000>;
 			interrupts-extended = <&cpu0_intc 11>, <&cpu0_intc 9>;
-- 
2.43.0