On 30 July 2016 at 17:03, Hans de Goede <hdegoede@xxxxxxxxxx> 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@xxxxxxxx> > Cc: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx> 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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
