dt-bindings: i2c: i2c-demux-pinctrl: Convert to json-schema (4411a2cc) · Commits · git / linux-nf

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

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		Pinctrl-based I2C Bus DeMux

		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\|--/ \|
		\| +------------+ \|
		\| \|
		+-------------------------------+

		Required properties:
		- compatible: "i2c-demux-pinctrl"
		- i2c-parent: List of phandles of I2C masters available for selection. The first
		one will be used as default.
		- i2c-bus-name: The name of this bus. Also needed as pinctrl-name for the I2C
		parents.

		Furthermore, I2C mux properties and child nodes. See i2c-mux.yaml in this
		directory.

		Example:

		Here is a snipplet for a bus to be demuxed. It contains various i2c clients for
		HDMI, so the bus is named "i2c-hdmi":

		i2chdmi: i2c@8 {

		compatible = "i2c-demux-pinctrl";
		i2c-parent = <&gpioi2c>, <&iic2>, <&i2c2>;
		i2c-bus-name = "i2c-hdmi";
		#address-cells = <1>;
		#size-cells = <0>;

		ak4643: sound-codec@12 {
		compatible = "asahi-kasei,ak4643";

		#sound-dai-cells = <0>;
		reg = <0x12>;
		};

		composite-in@20 {
		compatible = "adi,adv7180";
		reg = <0x20>;
		remote = <&vin1>;

		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>;

		adi,input-depth = <8>;
		adi,input-colorspace = "rgb";
		adi,input-clock = "1x";
		adi,input-style = <1>;
		adi,input-justification = "evenly";

		ports {
		#address-cells = <1>;
		#size-cells = <0>;

		port@0 {
		reg = <0>;
		adv7511_in: endpoint {
		remote-endpoint = <&du_out_lvds0>;
		};
		};

		port@1 {
		reg = <1>;
		adv7511_out: endpoint {
		remote-endpoint = <&hdmi_con>;
		};
		};
		};
		};
		};

		And for clarification, here are the snipplets for the i2c-parents:

		gpioi2c: i2c@9 {
		#address-cells = <1>;
		#size-cells = <0>;
		compatible = "i2c-gpio";
		gpios = <&gpio5 6 GPIO_ACTIVE_HIGH /* sda */
		&gpio5 5 GPIO_ACTIVE_HIGH /* scl */
		>;
		i2c-gpio,delay-us = <5>;
		};

		...

		&i2c2 {
		pinctrl-0 = <&i2c2_pins>;
		pinctrl-names = "i2c-hdmi";

		clock-frequency = <100000>;
		};

		...

		&iic2 {
		pinctrl-0 = <&iic2_pins>;
		pinctrl-names = "i2c-hdmi";

		clock-frequency = <100000>;
		};

		Please note:

		- pinctrl properties for the parent I2C controllers need a pinctrl state
		with the same name as i2c-bus-name, not "default"!

		- the i2c masters must have their status "disabled". This driver will
		enable them at runtime when needed.

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

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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>;
		};
		};
		};
		};
		};