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+# 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 <wsa+renesas@sang-engineering.com>
+
+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>;
+ };
+ };
+ };
+ };
+ };