[PATCH] mmc: dt: Add 'broken-cd' DT binding

[Thomas Abraham]

On 21 August 2012 16:31, Arnd Bergmann <arnd at arndb.de> wrote:
>
> On Tuesday 21 August 2012, Thomas Abraham wrote:
> > diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt
> > b/Documentation/devicetree/bindings/mmc/mmc.txt
> > index 8a6811f..1aa527a 100644
> > --- a/Documentation/devicetree/bindings/mmc/mmc.txt
> > +++ b/Documentation/devicetree/bindings/mmc/mmc.txt
> > @@ -16,6 +16,8 @@ Optional properties:
> >  - wp-inverted: when present, polarity on the wp gpio line is inverted
> >  - non-removable: non-removable slot (like eMMC)
> >  - max-frequency: maximum operating clock frequency
> > +- broken-cd: when present, indicates that the cd-gpios line is not
> > +       connected to the card-detect pad of the MMC host controller.
>
> What is the difference between listing the cd line as broken and
> listing no cd line at all?

I am trying to have a way to represent a gpio line as card detect line
that is not connected to the card-detect pad of the mmc controller but
instead used as a gpio interrupt line or polled gpio line.

'broken-cd' would imply that the card-detect pad of the mmc controller
is not connected to the card-detect pin at the slot. The 'cd-gpios'
property in that case would let the driver code to use the 'cd-gpios'
line as the external gpio interrupt or poll it.

Thanks,
Thomas.

>
>         Arnd
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