arm64: allwinner: pine64: add MMC support

All Pine64 boards connect an micro-SD card slot to the first MMC
controller.
Enable the respective DT node and specify the (always-on) regulator
and card-detect pin.
As a micro-SD slot does not feature a write-protect switch, we disable
this feature.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts b/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts
index cf9105179bcb..c680ed385da3 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pine64.dts
@@ -44,6 +44,8 @@
 
 #include "sun50i-a64.dtsi"
 
+#include <dt-bindings/gpio/gpio.h>
+
 / {
         model = "Pine64";
         compatible = "pine64,pine64", "allwinner,sun50i-a64";
@@ -55,6 +57,13 @@
         chosen {
                 stdout-path = "serial0:115200n8";
         };
+
+        reg_vcc3v3: vcc3v3 {
+                compatible = "regulator-fixed";
+                regulator-name = "vcc3v3";
+                regulator-min-microvolt = <3300000>;
+                regulator-max-microvolt = <3300000>;
+        };
 };
 
 &ehci1 {
@@ -71,6 +80,17 @@
         bias-pull-up;
 };
 
+&mmc0 {
+        pinctrl-names = "default";
+        pinctrl-0 = <&mmc0_pins>;
+        vmmc-supply = <&reg_vcc3v3>;
+        cd-gpios = <&pio 5 6 GPIO_ACTIVE_HIGH>;
+        cd-inverted;
+        disable-wp;
+        bus-width = <4>;
+        status = "okay";
+};
+
 &ohci1 {
         status = "okay";
 };