ARM: dts: stm32: Add ADC support to stm32mp157c

stm32mp157c has an ADC block with two physical ADCs.
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

arch/arm/boot/dts/stm32mp157c.dtsi

@@ -626,6 +626,42 @@ dmamux1: dma-router@48002000 {
 			clocks = <&rcc DMAMUX>;
 		};
 
+		adc: adc@48003000 {
+			compatible = "st,stm32mp1-adc-core";
+			reg = <0x48003000 0x400>;
+			interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 90 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&rcc ADC12>, <&rcc ADC12_K>;
+			clock-names = "bus", "adc";
+			interrupt-controller;
+			#interrupt-cells = <1>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+
+			adc1: adc@0 {
+				compatible = "st,stm32mp1-adc";
+				#io-channel-cells = <1>;
+				reg = <0x0>;
+				interrupt-parent = <&adc>;
+				interrupts = <0>;
+				dmas = <&dmamux1 9 0x400 0x01>;
+				dma-names = "rx";
+				status = "disabled";
+			};
+
+			adc2: adc@100 {
+				compatible = "st,stm32mp1-adc";
+				#io-channel-cells = <1>;
+				reg = <0x100>;
+				interrupt-parent = <&adc>;
+				interrupts = <1>;
+				dmas = <&dmamux1 10 0x400 0x01>;
+				dma-names = "rx";
+				status = "disabled";
+			};
+		};
+
 		usbotg_hs: usb-otg@49000000 {
 			compatible = "snps,dwc2";
 			reg = <0x49000000 0x10000>;