[PATCH] of: added documentation for spi chipselects

[Grant Likely]

On Tue, Feb 16, 2010 at 11:39 AM, Ernst Schwab <eschwab at online.de> wrote:
> From: Ernst Schwab <eschwab at online.de>
>
> Added devicetree binding documentation for gpios used as chipselect. The
> code to evaluate these is already present in spi_mpc8xxx.c.
>
> Signed-off-by: Ernst Schwab <eschwab at online.de>

Merged, thanks.


> ---
> diff -upr a/Documentation/powerpc/dts-bindings/fsl/spi.txt b/Documentation/powerpc/dts-bindings/fsl/spi.txt
> --- a/Documentation/powerpc/dts-bindings/fsl/spi.txt
> +++ b/Documentation/powerpc/dts-bindings/fsl/spi.txt
> @@ -13,6 +13,11 @@ Required properties:
>  - interrupt-parent : the phandle for the interrupt controller that
>   services interrupts for this device.
>
> +Optional properties:
> +- gpios : specifies the gpio pins to be used for chipselects.
> +  The gpios will be referred to as reg=<index> in the SPI child nodes.
> +  If unspecified, a single SPI device without a chip select can be used.
> +
>  Example:
>        spi at 4c0 {
>                cell-index = <0>;
> @@ -21,4 +26,6 @@ Example:
>                interrupts = <82 0>;
>                interrupt-parent = <700>;
>                mode = "cpu";
> +               gpios = <&gpio 18 1     // device reg=<0>, low-active
> +                        &gpio 19 1>;   // device reg=<1>, low-active
>        };
>
>
>



-- 
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.