dt-bindings: i2c: i2c-demux-pinctrl: Convert to json-schema

Convert the pinctrl-based I2C bus demultiplexer Device Tree binding
documentation to json-schema.

Update the example to match reality.

Signed-off-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Wolfram Sang <[email protected]>
Reviewed-by: Conor Dooley <[email protected]>
Signed-off-by: Wolfram Sang <[email protected]>

Author: geertu

Documentation/devicetree/bindings/i2c/i2c-demux-pinctrl.txt

@@ -0,0 +1,172 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/i2c/i2c-demux-pinctrl.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Pinctrl-based I2C Bus Demultiplexer
+
+maintainers:
+  - Wolfram Sang <[email protected]>
+
+description: |
+  This binding describes an I2C bus demultiplexer that uses pin multiplexing to
+  route the I2C signals, and represents the pin multiplexing configuration
+  using the pinctrl device tree bindings.  This may be used to select one I2C
+  IP core at runtime which may have a better feature set for a given task than
+  another I2C IP core on the SoC.  The most simple example is to fall back to
+  GPIO bitbanging if your current runtime configuration hits an errata of the
+  internal IP core.
+
+      +-------------------------------+
+      | SoC                           |
+      |                               |   +-----+  +-----+
+      |   +------------+              |   | dev |  | dev |
+      |   |I2C IP Core1|--\           |   +-----+  +-----+
+      |   +------------+   \-------+  |      |        |
+      |                    |Pinctrl|--|------+--------+
+      |   +------------+   +-------+  |
+      |   |I2C IP Core2|--/           |
+      |   +------------+              |
+      |                               |
+      +-------------------------------+
+
+allOf:
+  - $ref: i2c-mux.yaml
+  - $ref: /schemas/i2c/i2c-controller.yaml#
+
+properties:
+  compatible:
+    const: i2c-demux-pinctrl
+
+  i2c-parent:
+    $ref: /schemas/types.yaml#/definitions/phandle-array
+    description:
+      List of phandles of I2C masters available for selection.  The first one
+      will be used as default.
+
+  i2c-bus-name:
+    $ref: /schemas/types.yaml#/definitions/string
+    description:
+      The name of this bus.  Also needed as pinctrl-name for the I2C parents.
+
+required:
+  - compatible
+  - i2c-parent
+  - i2c-bus-name
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    gpioi2c2: i2c-9 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        compatible = "i2c-gpio";
+        scl-gpios = <&gpio5 5 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+        sda-gpios = <&gpio5 6 (GPIO_ACTIVE_HIGH | GPIO_OPEN_DRAIN)>;
+        i2c-gpio,delay-us = <5>;
+
+        // The I2C controller must have its status "disabled".  The I2C bus
+        // demultiplexer will enable it at runtime when needed.
+        status = "disabled";
+    };
+
+    iic2: i2c@e6520000 {
+        reg = <0xe6520000 0x425>;
+        pinctrl-0 = <&iic2_pins>;
+        // The pinctrl property for the parent I2C controller needs a pinctrl
+        // state with the same name as i2c-bus-name in the I2C bus demultiplexer
+        // node, not "default"!
+        pinctrl-names = "i2c-hdmi";
+
+        clock-frequency = <100000>;
+
+        // The I2C controller must have its status "disabled".  The I2C bus
+        // demultiplexer will enable it at runtime when needed.
+        status = "disabled";
+    };
+
+    i2c2: i2c@e6530000 {
+        reg = <0 0xe6530000 0 0x40>;
+        pinctrl-0 = <&i2c2_pins>;
+        // The pinctrl property for the parent I2C controller needs a pinctrl
+        // state with the same name as i2c-bus-name in the I2C bus demultiplexer
+        // node, not "default"!
+        pinctrl-names = "i2c-hdmi";
+
+        clock-frequency = <100000>;
+
+        // The I2C controller must have its status "disabled".  The I2C bus
+        // demultiplexer will enable it at runtime when needed.
+        status = "disabled";
+    };
+
+    // Example for a bus to be demuxed.  It contains various I2C clients for
+    // HDMI, so the bus is named "i2c-hdmi":
+    i2chdmi: i2c-mux3 {
+            compatible = "i2c-demux-pinctrl";
+            i2c-parent = <&iic2>, <&i2c2>, <&gpioi2c2>;
+            i2c-bus-name = "i2c-hdmi";
+            #address-cells = <1>;
+            #size-cells = <0>;
+
+            ak4643: codec@12 {
+                    compatible = "asahi-kasei,ak4643";
+                    #sound-dai-cells = <0>;
+                    reg = <0x12>;
+            };
+
+            composite-in@20 {
+                    compatible = "adi,adv7180";
+                    reg = <0x20>;
+
+                    port {
+                            adv7180: endpoint {
+                                    bus-width = <8>;
+                                    remote-endpoint = <&vin1ep0>;
+                            };
+                    };
+            };
+
+            hdmi@39 {
+                    compatible = "adi,adv7511w";
+                    reg = <0x39>;
+                    interrupt-parent = <&gpio1>;
+                    interrupts = <15 IRQ_TYPE_LEVEL_LOW>;
+                    clocks = <&cec_clock>;
+                    clock-names = "cec";
+
+                    avdd-supply = <&fixedregulator1v8>;
+                    dvdd-supply = <&fixedregulator1v8>;
+                    pvdd-supply = <&fixedregulator1v8>;
+                    dvdd-3v-supply = <&fixedregulator3v3>;
+                    bgvdd-supply = <&fixedregulator1v8>;
+
+                    adi,input-depth = <8>;
+                    adi,input-colorspace = "rgb";
+                    adi,input-clock = "1x";
+
+                    ports {
+                            #address-cells = <1>;
+                            #size-cells = <0>;
+
+                            port@0 {
+                                    reg = <0>;
+                                    adv7511_in: endpoint {
+                                            remote-endpoint = <&lvds0_out>;
+                                    };
+                            };
+
+                            port@1 {
+                                    reg = <1>;
+                                    adv7511_out: endpoint {
+                                            remote-endpoint = <&hdmi_con_out>;
+                                    };
+                            };
+                    };
+            };
+    };