[PATCH 3/5] powerpc: Document device nodes for I2C devices.

[Kumar Gala]

On May 17, 2007, at 9:38 AM, Scott Wood wrote:

> Document the use of device trees to describe devices on an I2C bus,  
> which
> will be used with David Brownell's "new style" I2C binding patches.
>
> Signed-off-by: Scott Wood <scottwood at freescale.com>
> ---
>  Documentation/powerpc/booting-without-of.txt |   34 +++++++++++++++ 
> +++++++++++
>  1 files changed, 34 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/powerpc/booting-without-of.txt b/ 
> Documentation/powerpc/booting-without-of.txt
> index b49ce16..67026ad 100644
> --- a/Documentation/powerpc/booting-without-of.txt
> +++ b/Documentation/powerpc/booting-without-of.txt
> @@ -1257,6 +1257,8 @@ platforms are moved over to use the flattened- 
> device-tree model.
>
>     e) I2C
>
> +   e1) I2C Controller
> +
>     Required properties :
>
>      - device_type : Should be "i2c"
> @@ -1277,6 +1279,10 @@ platforms are moved over to use the  
> flattened-device-tree model.
>        a digital filter sampling rate register
>      - fsl5200-clocking : boolean; if defined, indicated that this  
> device
>        uses the FSL 5200 clocking mechanism.
> +    - #address-cells : should exist and be 1 if I2C devices are  
> declared
> +      in the device tree.
> +    - #size-cells : should exist and be 0 if I2C devices are declared
> +      in the device tree.

As I've stated before, we need a bus number as well so we can handle  
things like I2C switches and muxes.

- k