ARM: dts: stm32: enable sdmmc2 node for stm32mp157c-ed1 board

On STM32MP157C-ED1, the eMMC is connected on instance 2 of SDMMC
peripheral. The sdmmc2 node is then added in the board DT file, as well as
the pins nodes in the pinctrl file.
Signed-off-by: Ludovic Barre <ludovic.barre@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157-pinctrl.dtsi

@@ -935,6 +935,124 @@ pins {
 				};
 			};
 
+			sdmmc2_b4_pins_a: sdmmc2-b4-0 {
+				pins1 {
+					pinmux = <STM32_PINMUX('B', 14, AF9)>, /* SDMMC2_D0 */
+						 <STM32_PINMUX('B', 15, AF9)>, /* SDMMC2_D1 */
+						 <STM32_PINMUX('B', 3, AF9)>, /* SDMMC2_D2 */
+						 <STM32_PINMUX('B', 4, AF9)>, /* SDMMC2_D3 */
+						 <STM32_PINMUX('G', 6, AF10)>; /* SDMMC2_CMD */
+					slew-rate = <1>;
+					drive-push-pull;
+					bias-pull-up;
+				};
+				pins2 {
+					pinmux = <STM32_PINMUX('E', 3, AF9)>; /* SDMMC2_CK */
+					slew-rate = <2>;
+					drive-push-pull;
+					bias-pull-up;
+				};
+			};
+
+			sdmmc2_b4_od_pins_a: sdmmc2-b4-od-0 {
+				pins1 {
+					pinmux = <STM32_PINMUX('B', 14, AF9)>, /* SDMMC2_D0 */
+						 <STM32_PINMUX('B', 15, AF9)>, /* SDMMC2_D1 */
+						 <STM32_PINMUX('B', 3, AF9)>, /* SDMMC2_D2 */
+						 <STM32_PINMUX('B', 4, AF9)>; /* SDMMC2_D3 */
+					slew-rate = <1>;
+					drive-push-pull;
+					bias-pull-up;
+				};
+				pins2 {
+					pinmux = <STM32_PINMUX('E', 3, AF9)>; /* SDMMC2_CK */
+					slew-rate = <2>;
+					drive-push-pull;
+					bias-pull-up;
+				};
+				pins3 {
+					pinmux = <STM32_PINMUX('G', 6, AF10)>; /* SDMMC2_CMD */
+					slew-rate = <1>;
+					drive-open-drain;
+					bias-pull-up;
+				};
+			};
+
+			sdmmc2_b4_sleep_pins_a: sdmmc2-b4-sleep-0 {
+				pins {
+					pinmux = <STM32_PINMUX('B', 14, ANALOG)>, /* SDMMC2_D0 */
+						 <STM32_PINMUX('B', 15, ANALOG)>, /* SDMMC2_D1 */
+						 <STM32_PINMUX('B', 3, ANALOG)>, /* SDMMC2_D2 */
+						 <STM32_PINMUX('B', 4, ANALOG)>, /* SDMMC2_D3 */
+						 <STM32_PINMUX('E', 3, ANALOG)>, /* SDMMC2_CK */
+						 <STM32_PINMUX('G', 6, ANALOG)>; /* SDMMC2_CMD */
+				};
+			};
+
+			sdmmc2_b4_pins_b: sdmmc2-b4-1 {
+				pins1 {
+					pinmux = <STM32_PINMUX('B', 14, AF9)>, /* SDMMC2_D0 */
+						 <STM32_PINMUX('B', 15, AF9)>, /* SDMMC2_D1 */
+						 <STM32_PINMUX('B', 3, AF9)>, /* SDMMC2_D2 */
+						 <STM32_PINMUX('B', 4, AF9)>, /* SDMMC2_D3 */
+						 <STM32_PINMUX('G', 6, AF10)>; /* SDMMC2_CMD */
+					slew-rate = <1>;
+					drive-push-pull;
+					bias-disable;
+				};
+				pins2 {
+					pinmux = <STM32_PINMUX('E', 3, AF9)>; /* SDMMC2_CK */
+					slew-rate = <2>;
+					drive-push-pull;
+					bias-disable;
+				};
+			};
+
+			sdmmc2_b4_od_pins_b: sdmmc2-b4-od-1 {
+				pins1 {
+					pinmux = <STM32_PINMUX('B', 14, AF9)>, /* SDMMC2_D0 */
+						 <STM32_PINMUX('B', 15, AF9)>, /* SDMMC2_D1 */
+						 <STM32_PINMUX('B', 3, AF9)>, /* SDMMC2_D2 */
+						 <STM32_PINMUX('B', 4, AF9)>; /* SDMMC2_D3 */
+					slew-rate = <1>;
+					drive-push-pull;
+					bias-disable;
+				};
+				pins2 {
+					pinmux = <STM32_PINMUX('E', 3, AF9)>; /* SDMMC2_CK */
+					slew-rate = <2>;
+					drive-push-pull;
+					bias-disable;
+				};
+				pins3 {
+					pinmux = <STM32_PINMUX('G', 6, AF10)>; /* SDMMC2_CMD */
+					slew-rate = <1>;
+					drive-open-drain;
+					bias-disable;
+				};
+			};
+
+			sdmmc2_d47_pins_a: sdmmc2-d47-0 {
+				pins {
+					pinmux = <STM32_PINMUX('A', 8, AF9)>, /* SDMMC2_D4 */
+						 <STM32_PINMUX('A', 9, AF10)>, /* SDMMC2_D5 */
+						 <STM32_PINMUX('E', 5, AF9)>, /* SDMMC2_D6 */
+						 <STM32_PINMUX('D', 3, AF9)>; /* SDMMC2_D7 */
+					slew-rate = <1>;
+					drive-push-pull;
+					bias-pull-up;
+				};
+			};
+
+			sdmmc2_d47_sleep_pins_a: sdmmc2-d47-sleep-0 {
+				pins {
+					pinmux = <STM32_PINMUX('A', 8, ANALOG)>, /* SDMMC2_D4 */
+						 <STM32_PINMUX('A', 9, ANALOG)>, /* SDMMC2_D5 */
+						 <STM32_PINMUX('E', 5, ANALOG)>, /* SDMMC2_D6 */
+						 <STM32_PINMUX('D', 3, ANALOG)>; /* SDMMC2_D7 */
+				};
+			};
+
 			spdifrx_pins_a: spdifrx-0 {
 				pins {
 					pinmux = <STM32_PINMUX('G', 12, AF8)>; /* SPDIF_IN1 */

arch/arm/boot/dts/stm32mp157c-ed1.dts

@@ -305,6 +305,22 @@ &sdmmc1 {
 	status = "okay";
 };
 
+&sdmmc2 {
+	pinctrl-names = "default", "opendrain", "sleep";
+	pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_d47_pins_a>;
+	pinctrl-1 = <&sdmmc2_b4_od_pins_a &sdmmc2_d47_pins_a>;
+	pinctrl-2 = <&sdmmc2_b4_sleep_pins_a &sdmmc2_d47_sleep_pins_a>;
+	non-removable;
+	no-sd;
+	no-sdio;
+	st,neg-edge;
+	bus-width = <8>;
+	vmmc-supply = <&v3v3>;
+	vqmmc-supply = <&v3v3>;
+	mmc-ddr-3_3v;
+	status = "okay";
+};
+
 &timers6 {
 	status = "okay";
 	/* spare dmas for other usage */