[Gc-linux-cvs] linux/Documentation/powerpc/dts-bindings/gpio i2c.txt, NONE, 1.1

[Albert H. <he...@us...>]

Update of /cvsroot/gc-linux/linux/Documentation/powerpc/dts-bindings/gpio
In directory ddv4jf1.ch3.sourceforge.com:/tmp/cvs-serv32158/Documentation/powerpc/dts-bindings/gpio

Added Files:
	i2c.txt 
Log Message:
[PATCH] i2c-gpio-of: GPIO-based I2C bitbang driver with OF bindings

From: Albert Herranz <alb...@ya...>
Date: Fri, 27 Feb 2009 21:30:15 +0100
Subject: [PATCH] i2c-gpio-of: GPIO-based I2C bitbang driver with OF bindings

Add a GPIO based I2C bitbang driver that supports device tree bindings.

Signed-off-by: Albert Herranz <alb...@ya...>


--- NEW FILE: i2c.txt ---
GPIO-based I2C

Required properties:
- compatible : should be "virtual,i2c-gpio".
- gpios : should specify GPIOs used for SDA and SCL lines, in that order.
- sda-is-open-drain : should be non-zero if SDA gpio is open-drain.
- scl-is-open-drain : should be non-zero if SCL gpio is open-drain.
- scl-is-output-only : should be non-zero if SCL is an output gpio only.
- udelay : signal toggle delay. SCL frequency is (500 / udelay) kHz
- timeout : clock stretching timeout in milliseconds.

Example:

gpio0: starlet-gpio@0d8000c0 {
	compatible = "nintendo,starlet-gpio";
	reg = <0d8000c0 4>;
	gpio-controller;
	#gpio-cells = <2>;
};

i2c-video {
	#address-cells = <1>;
	#size-cells = <0>;
	compatible = "virtual,i2c-gpio";

	gpios = <&gpio0 10 0	/* SDA line */
		 &gpio0 11 0	/* SCL line */
		>;
	sda-is-open-drain = <1>;
	scl-is-open-drain = <1>;
	scl-is-output-only = <1>;
	udelay = <2>;

	audio-video-encoder {
		compatible = "nintendo,wii-ave-rvl";
		reg = <70>;
	};
};