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Commit 10a6218e authored by Brendan Higgins's avatar Brendan Higgins Committed by Wolfram Sang
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i2c: aspeed: added documentation for Aspeed I2C driver 



Added device tree binding documentation for Aspeed I2C busses.

Signed-off-by: default avatarBrendan Higgins <brendanhiggins@google.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent b395ba21

Documentation/devicetree/bindings/i2c/i2c-aspeed.txt

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Device tree configuration for the I2C busses on the AST24XX and AST25XX SoCs.



Required Properties:

- #address-cells	: should be 1

- #size-cells		: should be 0

- reg			: address offset and range of bus

- compatible		: should be "aspeed,ast2400-i2c-bus"

			  or "aspeed,ast2500-i2c-bus"

- clocks		: root clock of bus, should reference the APB

			  clock

- interrupts		: interrupt number

- interrupt-parent	: interrupt controller for bus, should reference a

			  aspeed,ast2400-i2c-ic or aspeed,ast2500-i2c-ic

			  interrupt controller



Optional Properties:

- bus-frequency	: frequency of the bus clock in Hz defaults to 100 kHz when not

		  specified

- multi-master	: states that there is another master active on this bus.



Example:



i2c {

	compatible = "simple-bus";

	#address-cells = <1>;

	#size-cells = <1>;

	ranges = <0 0x1e78a000 0x1000>;



	i2c_ic: interrupt-controller@0 {

		#interrupt-cells = <1>;

		compatible = "aspeed,ast2400-i2c-ic";

		reg = <0x0 0x40>;

		interrupts = <12>;

		interrupt-controller;

	};



	i2c0: i2c-bus@40 {

		#address-cells = <1>;

		#size-cells = <0>;

		#interrupt-cells = <1>;

		reg = <0x40 0x40>;

		compatible = "aspeed,ast2400-i2c-bus";

		clocks = <&clk_apb>;

		bus-frequency = <100000>;

		interrupts = <0>;

		interrupt-parent = <&i2c_ic>;

	};

};