On Sat, Jul 16, 2016 at 3:16 PM, Hans de Goede [off-list ref] wrote:

mmc/sdio is an enumerable bus, so usually the os can find out which
device is attached without needing a compatible.

Usually, yes, but always, no. Having it doesn't hurt either, so this
is a NAK for me.

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 properties optional.

Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Maxime Ripard <redacted>
Signed-off-by: Hans de Goede <redacted>