From: Dang Huynh <dang.huynh@mainlining.org>

Since we have a SDMMC controller, we can use the SD card slot on the
Orange Pi 2G-IOT.

Signed-off-by: Dang Huynh <dang.huynh@mainlining.org>
---
 .../boot/dts/unisoc/rda8810pl-orangepi-2g-iot.dts    | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm/boot/dts/unisoc/rda8810pl-orangepi-2g-iot.dts b/arch/arm/boot/dts/unisoc/rda8810pl-orangepi-2g-iot.dts
index 46ccb9ad510c0df142b845d6fc5633b69c2298dd..f6b1a1485645f5714cdf14447cbee50e28e3c076 100644
--- a/arch/arm/boot/dts/unisoc/rda8810pl-orangepi-2g-iot.dts
+++ b/arch/arm/boot/dts/unisoc/rda8810pl-orangepi-2g-iot.dts
@@ -6,6 +6,7 @@
 
 /dts-v1/;
 
+#include <dt-bindings/gpio/gpio.h>
 #include "rda8810pl.dtsi"
 
 / {
@@ -27,6 +28,13 @@ memory@80000000 {
 		reg = <0x80000000 0x10000000>;
 	};
 
+	vdd_sdmmc: regulator-fixed {
+		compatible = "regulator-fixed";
+		regulator-name = "vdd_sdmmc";
+		regulator-min-microvolt = <2800000>;
+		regulator-max-microvolt = <2800000>;
+	};
+
 	uart_clk: uart-clk {
 		compatible = "fixed-clock";
 		clock-frequency = <921600>;
@@ -34,6 +42,18 @@ uart_clk: uart-clk {
 	};
 };
 
+&mmc1 {
+	status = "okay";
+	no-sdio;
+	no-mmc;
+	bus-width = <4>;
+	max-frequency = <30000000>;
+	cd-gpios = <&gpiob 4 GPIO_ACTIVE_LOW>;
+	vmmc-supply = <&vdd_sdmmc>;
+	rda,mclk-adj = /bits/ 8 <1>;
+	rda,mclk-inv;
+};
+
 &uart3 {
 	status = "okay";
 	clocks = <&uart_clk>;

-- 
2.51.0