On Wed, 13 May 2015, Eric Anholt wrote:

> This driver will provide support for calls into the firmware that will
> be used by other drivers like cpufreq and vc4.
> 
> Signed-off-by: Eric Anholt <[email protected]>
> ---
> 
> v2: Improve commit message, point to mailbox.txt for how mboxes work.
> 
>  .../devicetree/bindings/arm/bcm/raspberrypi,firmware.txt | 16 
> ++++++++++++++++
>  1 file changed, 16 insertions(+)
>  create mode 100644 
> Documentation/devicetree/bindings/arm/bcm/raspberrypi,firmware.txt
> 
> diff --git 
> a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,firmware.txt 
> b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,firmware.txt
> new file mode 100644
> index 0000000..33b0043
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,firmware.txt
> @@ -0,0 +1,16 @@
> +Raspberry Pi VideoCore firmware driver
> +
> +Required properties:
> +
> +- compatible:                Should be "rasbperrypi,firmware"
> +- mboxes:            Single-entry list which specifies which mailbox
> +                       controller and channel is used.  See
> +                       Documentation/devicetree/bindings/mailbox/mailbox.txt
> +                       for the semantics of this property

That's not what it looks like to me.  There is no mention of channels
in a 0 cell property.  Keep it simple.  How about:

Phandle to the firmware device's Mailbox.
(See: ../mailbox/mailbox.txt for more information)

> +Example:
> +
> +firmware {
> +     compatible = "rasbperrypi,firmware";
> +     mboxes = <&mailbox>;
> +};
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