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

From: Anders Berg
Date: Fri Sep 05 2014 - 05:05:53 EST

> On Thu, Sep 4, 2014 at 7:06 PM, Mark Brown <broonie@xxxxxxxxxx> wrote:
>> On Thu, Sep 04, 2014 at 07:04:44PM +0200, Linus Walleij wrote:
>>> I need an ACK from Mark Brown on this before I apply.
>>> The driver seems to do what it should, but I need Mark to
>>> be OK with exporting the CS signals from an SSP/SPI block
>>> to be exposed to Linux as GPIOs.
>>> (Top-posting and quoting patch verbatim so Mark gets it.)
>> I don't see any sort of reasoning for this?
> Maybe there was some earlier, but this is an excellent opportunity
> to repeat it... So Anders: why do you want to do this?

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...

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