[PATCH v2 3/3] dt-bindings: mmc: convert amlogic,meson-mx-sdio.txt to dtschema

[Martin Blumenstingl]

Hi Krzysztof,

On Tue, Sep 24, 2024 at 11:18 AM Krzysztof Kozlowski <krzk at kernel.org> wrote:
[...]
> > +        enum: [0, 1, 2]
> > +
> > +      bus-width:
> > +        enum: [1, 4]
> > +
> > +    unevaluatedProperties: false
>
> Hm, I wonder why not all slots are defined in your DTS? Why not all of
> them are required? I assume the slots are there always, as part of the
> controller.
>
> Is this because of driver limitation mentioned in the old binding?
The MMC core (still) has a limitation of only supporting one slot per
controller - so a limitation will stay in place.

However, the driver (drivers/mmc/host/meson-mx-sdio.c) uses
of_get_compatible_child(), meaning it will also pick the first child
node with the correct compatible string, even if it has status =
"disabled".
I can send a patch to reduce the scope of this limitation: all slots
can be defined but only the first enabled one is used.
What do you think?


Best regards,
Martin