[RFC PATCH 10/10] documentation/dt: Add OMAP GPIO properties

[grant.likely@secretlab.ca (Grant Likely)]

On Wed, Aug 24, 2011 at 03:09:16PM +0200, Benoit Cousson wrote:
> Add documentation for GPIO properties specific to OMAP.
> 
> Signed-off-by: Benoit Cousson <b-cousson@ti.com>
> Cc: Randy Dunlap <rdunlap@xenotime.net>
> ---
>  .../devicetree/bindings/gpio/gpio-omap.txt         |   33 ++++++++++++++++++++
>  1 files changed, 33 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/gpio/gpio-omap.txt
> 
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-omap.txt b/Documentation/devicetree/bindings/gpio/gpio-omap.txt
> new file mode 100644
> index 0000000..692b1c7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-omap.txt
> @@ -0,0 +1,33 @@
> +OMAP GPIO controller
> +
> +Required properties:
> +- compatible:
> +  - "ti,omap2-gpio" for OMAP2 and OMAP3 controllers
> +  - "ti,omap4-gpio" for OMAP4 controller
> +- #gpio-cells : Should be two.
> +  - first cell is the pin number
> +  - second cell is used to specify optional parameters (unused)
> +- gpio-controller : Marks the device node as a GPIO controller.
> +
> +OMAP specific properties:
> +- hwmods: Name of the hwmod associated to the GPIO
> +- id: 32 bits to identify the id (1 based index)

id should not be necessary.  Linux GPIO numbers are to be dynamically
assigned when using DT.

> +- bank_width: number of pin supported by the controller (16 or 32)
> +- debounce: set if the controller support the debouce funtionnality
> +- bank_count: number of controller support by the SoC. This is a temporary
> +  hack until the bank_count is removed from the driver.

All these properties should be prefixed with "ti,".
Use '-' instead of '_' in property names

> +
> +
> +Example:
> +
> +gpio4: gpio4 {
> +    compatible = "ti,omap4-gpio", "ti,omap-gpio";
> +    hwmods = "gpio4";
> +    id = <4>;
> +    bank_width = <32>;
> +    debounce;
> +    no_idle_on_suspend;
> +    #gpio-cells = <2>;
> +    gpio-controller;
> +};
> +
> -- 
> 1.7.0.4
>