dts: add declaration of stm32mp157

Add the declaration of the ST Microlectronics
stm32mp157 soc.

Signed-off-by: Arnaud Pouliquen <[email protected]>

Author: arnopo

dts/arm/st/mp1/stm32mp157.dtsi

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2019 STMicroelectronics
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <mem.h>
+#include <arm/armv7-m.dtsi>
+
+/ {
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "arm,cortex-m4";
+			reg = <0>;
+		};
+	};
+
+	retram: memory0@0 {
+		device_type = "memory";
+		compatible = "mmio-sram";
+		reg = <0x00000000 DT_SIZE_K(64)>;
+	};
+	mcusram: memory1@10000000 {
+		device_type = "memory";
+		compatible = "mmio-sram";
+		reg = <0x10000000 DT_SIZE_K(256)>;
+	};
+
+	soc {
+		rcc: rcc@50000000 {
+			compatible = "st,stm32-rcc";
+			clocks-controller;
+			#clocks-cells = <2>;
+			reg = <0x50000000 0x1000>;
+			label = "STM32_CLK_RCC";
+		};
+
+	};
+};
+
+&nvic {
+	arm,num-irq-priority-bits = <4>;
+};