[RFC PATCH] ARM: dts: meson8b-odroidc1: add microSD support

[linus.luessing@c0d3.blue (Linus Lüssing)]

The Odroid C1 features a microSD slot. This patch adds the necessary
DT bindings to support it.

Signed-off-by: Linus L?ssing <linus.luessing@c0d3.blue>
---
This patch only worked after Martin's attempt to fix the pinctrl issues
for meson8b:

https://patchwork.kernel.org/patch/10181185/

Another note: I was seeing the following error message in dmesg after
writing a 64MB file to the microSD card and right after typing "$ sync":

[  512.584687] mmcblk0: error -84 sending status command, retrying
[  512.586985] mmcblk0: timed out sending r/w cmd command, card status 0xd00
[  512.591756] mmcblk0: status not valid, retrying timeout

However read/write operations seemed unaffected. The file seemed fine
afterwards, even after unmounting, replugging and remounting the microSD
card.

Not sure whether this error message could potentially point to some
error in the changes in here.


 arch/arm/boot/dts/meson8b-odroidc1.dts | 58 ++++++++++++++++++++++++++++++++++
 arch/arm/boot/dts/meson8b.dtsi         |  8 +++++
 2 files changed, 66 insertions(+)

diff --git a/arch/arm/boot/dts/meson8b-odroidc1.dts b/arch/arm/boot/dts/meson8b-odroidc1.dts
index d5e83051bb54..3a5603d95b70 100644
--- a/arch/arm/boot/dts/meson8b-odroidc1.dts
+++ b/arch/arm/boot/dts/meson8b-odroidc1.dts
@@ -54,6 +54,7 @@
 
 	aliases {
 		serial0 = &uart_AO;
+		mmc0 = &sd_card_slot;
 	};
 
 	memory {
@@ -69,6 +70,37 @@
 			default-state = "off";
 		};
 	};
+
+	tflash_vdd: regulator-tflash_vdd {
+		/*
+		 * signal name from schematics: TFLASH_VDD_EN
+		 */
+		compatible = "regulator-fixed";
+
+		regulator-name = "TFLASH_VDD";
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+
+		gpio = <&gpio GPIOY_12 GPIO_ACTIVE_HIGH>;
+		enable-active-high;
+	};
+
+	tf_io: gpio-regulator-tf_io {
+		compatible = "regulator-gpio";
+
+		regulator-name = "TF_IO";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <3300000>;
+
+		/*
+		 * signal name from schematics: TF_3V3N_1V8_EN
+		 */
+		gpios = <&gpio_ao GPIOAO_3 GPIO_ACTIVE_HIGH>;
+		gpios-states = <0>;
+
+		states = <3300000 0
+			  1800000 1>;
+	};
 };
 
 &uart_AO {
@@ -100,6 +132,32 @@
 	status = "okay";
 };
 
+&sdio {
+	status = "okay";
+
+	pinctrl-0 = <&sd_b_pins>;
+	pinctrl-names = "default";
+
+	/* SD card */
+	sd_card_slot: slot at 1 {
+		compatible = "mmc-slot";
+		reg = <1>;
+		status = "okay";
+
+		bus-width = <4>;
+		no-sdio;
+		cap-mmc-highspeed;
+		cap-sd-highspeed;
+		disable-wp;
+
+		cd-gpios = <&gpio CARD_6 GPIO_ACTIVE_HIGH>;
+		cd-inverted;
+
+		vmmc-supply = <&tflash_vdd>;
+		vqmmc-supply = <&tf_io>;
+	};
+};
+
 &ethmac {
 	status = "okay";
 
diff --git a/arch/arm/boot/dts/meson8b.dtsi b/arch/arm/boot/dts/meson8b.dtsi
index fa5274aa370b..87687c09ca3f 100644
--- a/arch/arm/boot/dts/meson8b.dtsi
+++ b/arch/arm/boot/dts/meson8b.dtsi
@@ -206,6 +206,14 @@
 				function = "ethernet";
 			};
 		};
+
+		sd_b_pins: sd-b {
+			mux {
+				groups = "sd_d0_b", "sd_d1_b", "sd_d2_b",
+					"sd_d3_b", "sd_clk_b", "sd_cmd_b";
+				function = "sd_b";
+			};
+		};
 	};
 };
 
-- 
2.11.0