dts: bindings: tach: Add nodes and bindings for tachometer

Introduction of tachometer device nodes for the Microchip
MEC1501 SOC. In addition, dts bindings for are also introduced.

Signed-off-by: Francisco Munoz <francisco.munoz.ruiz@intel.com>

dts/arm/microchip/mec1501hsz.dtsi

@@ -342,6 +342,42 @@
 			#size-cells = <0>;
 			status = "disabled";
 		};
+		tach0: tach@40006000 {
+			compatible = "microchip,xec-tach";
+			reg = <0x40006000 0x10>;
+			interrupts = <71 4>;
+			label = "TACH_0";
+			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+		tach1: tach@40006010 {
+			compatible = "microchip,xec-tach";
+			reg = <0x40006010 0x10>;
+			interrupts = <72 4>;
+			label = "TACH_1";
+			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+		tach2: tach@40006020 {
+			compatible = "microchip,xec-tach";
+			reg = <0x40006020 0x10>;
+			interrupts = <73 4>;
+			label = "TACH_2";
+			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+		tach3: tach@40006030 {
+			compatible = "microchip,xec-tach";
+			reg = <0x40006030 0x10>;
+			interrupts = <159 4>;
+			label = "TACH_3";
+			status = "disabled";
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
 	};
 };
 

dts/bindings/tach/microchip,xec-tach.yaml

@@ -0,0 +1,21 @@
+# Copyright (c) 2020, Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+description: Microchip XEC tachometer controller
+
+compatible: "microchip,xec-tach"
+
+include: tach.yaml
+
+properties:
+    "#address-cells":
+      required: true
+      const: 1
+    "#size-cells":
+      type: int
+      const: 0
+    reg:
+      required: true
+
+    interrupts:
+      required: true

dts/bindings/tach/tach.yaml

@@ -0,0 +1,12 @@
+# Copyright (c) 2020, Intel Corporation
+# SPDX-License-Identifier: Apache-2.0
+
+# Common properties for HW supported tachometers
+
+include: base.yaml
+
+bus: tach
+
+properties:
+    label:
+      required: true