[PATCH 1/2] gpio: Add driver for AXM55xx SSP chip selects

[Anders Berg]

On Sat, Sep 6, 2014 at 3:53 PM, Mark Brown <broonie at kernel.org> wrote:
> On Fri, Sep 05, 2014 at 11:05:37AM +0200, Anders Berg wrote:
>
>> Well, the problem with adding this to the spi-pl022 driver (as a
>> vendor specific extension) is that this IP block unfortunately isn't
>> distinguishable from the standard ARM PL022 implementation (same
>> values in the PrimeCell identification registers). That's why I went
>> down the GPIO path...
>
> Would it not be more straightforward to just register it as a platform
> device in this case, or use a separate OF ID in the DT?  We appear to
> specify a compatible string when registering AMBA devices even if we are
> capable of identifying using the ID registers.

I'll drop this gpio patch for now and submit a patch on the pl022
driver instead. I read the arm,primecell binding and learned that
there is a property (arm,primecell-periphid) that can be used to
override the HW PrimeCell ID. Seems like something to use here, right?

/Anders