dts: Add spi node for atmel sam series soc

Add SPI1 and SPI2 support

Signed-off-by: qianfan Zhao <qianfanguijin@163.com>

dts/arm/atmel/same70.dtsi

@@ -68,6 +68,28 @@
 			status = "disabled";
 		};
 
+		spi0: spi@40008000 {
+			compatible = "atmel,sam-spi";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x40008000 0x4000>;
+			interrupts = <21 0>;
+			peripheral-id = <21>;
+			label = "SPI_0";
+			status = "disabled";
+		};
+
+		spi1: spi@40058000 {
+			compatible = "atmel,sam-spi";
+			#address-cells = <1>;
+			#size-cells = <0>;
+			reg = <0x40058000 0x4000>;
+			interrupts = <42 0>;
+			peripheral-id = <42>;
+			label = "SPI_1";
+			status = "disabled";
+		};
+
 		uart0: uart@400E0800 {
 			compatible = "atmel,sam-uart";
 			reg = <0x400E0800 0x100>;

dts/bindings/spi/atmel,sam-spi.yaml

@@ -0,0 +1,38 @@
+#
+# Copyright (c) 2018, qianfan Zhao
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+---
+title: Atmel SAM SPI driver
+id: atmel,sam-spi
+version: 0.1
+
+description: >
+    This binding gives a base representation of the Atmel SAM SPI controller
+
+inherits:
+    !include spi.yaml
+
+properties:
+    compatible:
+      constraint: "atmel,sam-spi"
+
+    reg:
+      type: array
+      description: mmio register space
+      generation: define
+      category: required
+
+    interrupts:
+      type: array
+      category: required
+      description: required interrupts
+      generation: define
+
+    peripheral-id:
+      type: int
+      description: peripheral ID
+      generation: define
+      category: required
+...