ARM: dts: stm32mp1: DT alignment with Linux 5.6-rc1

This commit manages diversity for STM32M15x SOCs with:
- dedicated files to support all STM32MP15 SOCs family.
  The differences between those SOCs are:
  -STM32MP151 [1]: common file.
  -STM32MP153 [2]: STM32MP151 + CANs + a second CortexA7-CPU.
  -STM32MP157 [3]: STM32MP153 + DSI + GPU.
- new files to manage security diversity on STM32MP15x SOCs.
  On STM32MP15xY, "Y" gives information:
  -Y = A means no cryp IP and no secure boot.
  -Y = C means cryp IP + secure boot.
- stm32mp157 pinctrl files to better manage package diversity.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/arch/arm/dts/stm32mp157.dtsi b/arch/arm/dts/stm32mp157.dtsi
new file mode 100644
index 0000000..3f0a4a9
--- /dev/null
+++ b/arch/arm/dts/stm32mp157.dtsi
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
+/*
+ * Copyright (C) STMicroelectronics 2019 - All Rights Reserved
+ * Author: Alexandre Torgue <alexandre.torgue@st.com> for STMicroelectronics.
+ */
+
+#include "stm32mp153.dtsi"
+
+/ {
+	soc {
+		gpu: gpu@59000000 {
+			compatible = "vivante,gc";
+			reg = <0x59000000 0x800>;
+			interrupts = <GIC_SPI 109 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&rcc GPU>, <&rcc GPU_K>;
+			clock-names = "bus" ,"core";
+			resets = <&rcc GPU_R>;
+			status = "disabled";
+		};
+
+		dsi: dsi@5a000000 {
+			compatible = "st,stm32-dsi";
+			reg = <0x5a000000 0x800>;
+			clocks = <&rcc DSI_K>, <&clk_hse>, <&rcc DSI_PX>;
+			clock-names = "pclk", "ref", "px_clk";
+			resets = <&rcc DSI_R>;
+			reset-names = "apb";
+			status = "disabled";
+		};
+	};
+};