[PATCH v2] dt: bindings: Make compatible optional for mmc function nodes

[Ulf Hansson]

On 30 July 2016 at 17:03, Hans de Goede <hdegoede at redhat.com> wrote:
> On some boards (android tablets) different batches use different sdio
> wifi modules. This is not a problem since mmc/sdio is an enumerable bus,
> so we only need to describe and activate the mmc controller in dt and
> then the kernel will automatically load the right driver.
>
> Sometimes it is useful to specify certain ethernet properties for these
> "unknown" sdio devices, specifically we want the boot-loader to be able
> to set "local-mac-address" as some of these sdio wifi modules come without
> an eeprom / without a factory programmed mac address.
>
> Since the exact device is unknown (differs per batch) we cannot use
> a wifi-chip specific compatible, thus sometimes it is desirable to have a
> mmc function node, without having to make up an otherwise unused compatible
> for the node, so make the compatible property optional.
>
> Cc: Arnd Bergmann <arnd at arndb.de>
> Cc: Maxime Ripard <maxime.ripard at free-electrons.com>
> Signed-off-by: Hans de Goede <hdegoede at redhat.com>

Thanks, applied for next!

Kind regards
Uffe

> ---
> Changes in v2:
> -Change the commit-msg to explain why it sometimes is desirable to have a
>  mmc function node without a compatible
> ---
>  Documentation/devicetree/bindings/mmc/mmc.txt | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
> index ed23b9b..a96c338 100644
> --- a/Documentation/devicetree/bindings/mmc/mmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/mmc.txt
> @@ -98,11 +98,13 @@ Required host node properties when using function subnodes:
>  - #size-cells: should be zero.
>
>  Required function subnode properties:
> -- compatible: name of SDIO function following generic names recommended practice
>  - reg: Must contain the SDIO function number of the function this subnode
>         describes. A value of 0 denotes the memory SD function, values from
>         1 to 7 denote the SDIO functions.
>
> +Optional function subnode properties:
> +- compatible: name of SDIO function following generic names recommended practice
> +
>
>  Examples
>  --------
> --
> 2.7.4
>
> --
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