dt-bindings: i2c: i2c-mux-pca954x: Convert to DT schema

Convert the i2c-mux-pca954x binding to DT schema format.

Add the missing compatible for 'nxp,pca9645' which is already in use.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Wolfram Sang <wsa@kernel.org>
Acked-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210526184839.2937899-6-robh@kernel.org

Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.txt

-* NXP PCA954x I2C bus switch
-
-The driver supports NXP PCA954x and PCA984x I2C mux/switch devices.
-
-Required Properties:
-
-  - compatible: Must contain one of the following.
-    "nxp,pca9540",
-    "nxp,pca9542",
-    "nxp,pca9543",
-    "nxp,pca9544",
-    "nxp,pca9545",
-    "nxp,pca9546", "nxp,pca9846",
-    "nxp,pca9547", "nxp,pca9847",
-    "nxp,pca9548", "nxp,pca9848",
-    "nxp,pca9849"
-
-  - reg: The I2C address of the device.
-
-  The following required properties are defined externally:
-
-  - Standard I2C mux properties. See i2c-mux.txt in this directory.
-  - I2C child bus nodes. See i2c-mux.txt in this directory.
-
-Optional Properties:
-
-  - reset-gpios: Reference to the GPIO connected to the reset input.
-  - idle-state: if present, overrides i2c-mux-idle-disconnect,
-    Please refer to Documentation/devicetree/bindings/mux/mux-controller.yaml
-  - i2c-mux-idle-disconnect: Boolean; if defined, forces mux to disconnect all
-    children in idle state. This is necessary for example, if there are several
-    multiplexers on the bus and the devices behind them use same I2C addresses.
-  - interrupts: Interrupt mapping for IRQ.
-  - interrupt-controller: Marks the device node as an interrupt controller.
-  - #interrupt-cells : Should be two.
-    - first cell is the pin number
-    - second cell is used to specify flags.
-    See also Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
-
-Example:
-
-	i2c-switch@74 {
-		compatible = "nxp,pca9548";
-		#address-cells = <1>;
-		#size-cells = <0>;
-		reg = <0x74>;
-
-		interrupt-parent = <&ipic>;
-		interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
-		interrupt-controller;
-		#interrupt-cells = <2>;
-
-		i2c@2 {
-			#address-cells = <1>;
-			#size-cells = <0>;
-			reg = <2>;
-
-			eeprom@54 {
-				compatible = "atmel,24c08";
-				reg = <0x54>;
-			};
-		};
-
-		i2c@4 {
-			#address-cells = <1>;
-			#size-cells = <0>;
-			reg = <4>;
-
-			rtc@51 {
-				compatible = "nxp,pcf8563";
-				reg = <0x51>;
-			};
-		};
-	};

Documentation/devicetree/bindings/i2c/i2c-mux-pca954x.yaml

+# SPDX-License-Identifier: GPL-2.0
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/i2c-mux-pca954x.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP PCA954x I2C bus switch
+
+maintainers:
+  - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
+
+description:
+  The binding supports NXP PCA954x and PCA984x I2C mux/switch devices.
+
+allOf:
+  - $ref: /schemas/i2c/i2c-mux.yaml#
+
+properties:
+  compatible:
+    oneOf:
+      - enum:
+          - nxp,pca9540
+          - nxp,pca9542
+          - nxp,pca9543
+          - nxp,pca9544
+          - nxp,pca9545
+          - nxp,pca9546
+          - nxp,pca9547
+          - nxp,pca9548
+          - nxp,pca9846
+          - nxp,pca9847
+          - nxp,pca9848
+          - nxp,pca9849
+      - items:
+          - const: nxp,pca9646
+          - const: nxp,pca9546
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  "#interrupt-cells":
+    const: 2
+
+  interrupt-controller: true
+
+  reset-gpios:
+    maxItems: 1
+
+  i2c-mux-idle-disconnect:
+    type: boolean
+    description: Forces mux to disconnect all children in idle state. This is
+      necessary for example, if there are several multiplexers on the bus and
+      the devices behind them use same I2C addresses.
+
+  idle-state:
+    description: if present, overrides i2c-mux-idle-disconnect
+    $ref: /schemas/mux/mux-controller.yaml#/properties/idle-state
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        i2c-mux@74 {
+            compatible = "nxp,pca9548";
+            #address-cells = <1>;
+            #size-cells = <0>;
+            reg = <0x74>;
+
+            interrupt-parent = <&ipic>;
+            interrupts = <17 IRQ_TYPE_LEVEL_LOW>;
+            interrupt-controller;
+            #interrupt-cells = <2>;
+
+            i2c@2 {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                reg = <2>;
+
+                eeprom@54 {
+                    compatible = "atmel,24c08";
+                    reg = <0x54>;
+                };
+            };
+
+            i2c@4 {
+                #address-cells = <1>;
+                #size-cells = <0>;
+                reg = <4>;
+
+                rtc@51 {
+                    compatible = "nxp,pcf8563";
+                    reg = <0x51>;
+                };
+            };
+        };
+    };
+...