[PATCH v2 2/2] arm64: dts: st: enable eMMC on stm32mp257f-dk

[Mateusz Nowicki]

Enable the 8-Gbyte eMMC v5.1 connected to SDMMC2 with an 8-bit bus on
the STM32MP257F-DK. VDDIO2 is tied to the 1.8 V rail on this board, so
the DDR52 and HS200 modes are used.

Use the _b pin groups, the _a groups do not give reliable reads in
HS200 mode on this board. Tested in HS200 mode at 100 MHz.

Signed-off-by: Mateusz Nowicki <mateusz.nowicki at posteo.net>
---
 arch/arm64/boot/dts/st/stm32mp257f-dk.dts | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/arch/arm64/boot/dts/st/stm32mp257f-dk.dts b/arch/arm64/boot/dts/st/stm32mp257f-dk.dts
index 8daf3dfd5133..a7ad91d5beed 100644
--- a/arch/arm64/boot/dts/st/stm32mp257f-dk.dts
+++ b/arch/arm64/boot/dts/st/stm32mp257f-dk.dts
@@ -21,6 +21,8 @@ / {
 	aliases {
 		ethernet0 = &ethernet1;
 		serial0 = &usart2;
+		mmc0 = &sdmmc1;
+		mmc1 = &sdmmc2;
 	};
 
 	chosen {
@@ -279,6 +281,23 @@ &sdmmc1 {
 	status = "okay";
 };
 
+&sdmmc2 {
+	pinctrl-names = "default", "opendrain", "sleep";
+	pinctrl-0 = <&sdmmc2_b4_pins_b &sdmmc2_d47_pins_b>;
+	pinctrl-1 = <&sdmmc2_b4_od_pins_b &sdmmc2_d47_pins_b>;
+	pinctrl-2 = <&sdmmc2_b4_sleep_pins_a &sdmmc2_d47_sleep_pins_a>;
+	non-removable;
+	no-sd;
+	no-sdio;
+	st,neg-edge;
+	bus-width = <8>;
+	mmc-ddr-1_8v;
+	mmc-hs200-1_8v;
+	vmmc-supply = <&scmi_vdd_emmc>;
+	vqmmc-supply = <&scmi_vddio2>;
+	status = "okay";
+};
+
 &usart2 {
 	pinctrl-names = "default", "idle", "sleep";
 	pinctrl-0 = <&usart2_pins_a>;
-- 
2.55.0