Re: [PATCH v2 2/2] devicetree: Add devicetree bindings documentation for Cadence SPI

[Harini Katakam <harinikatakamlinux@xxxxxxxxx>]

Hi Mark,

On Fri, Apr 4, 2014 at 8:12 PM, Mark Brown <broonie@xxxxxxxxxx> wrote:
> On Fri, Apr 04, 2014 at 07:38:14PM +0530, Harini Katakam wrote:
>
>> OK. I understand.
>> Can you comment on the case where a decoder is used?
>
>> There is support for adding a decoder where extended slaves can be selected
>> through the IP's control register.
>> (This is not currently implemented in the driver but will be in the future.)
>
>> How should the driver know whether it is 4 or 16 select lines for example?
>> This has to be written to master->num_chipselect.
>
> That's the sort of case where it's useful yes - depending on how the
> implementation is done it may be sensible to just have a property
> specifying if a decoder is there (if it just changes the encoding in the
> register for example).

OK, great. That approach will work.

Regards,
Harini
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