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

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Date:	Mon, 8 Sep 2014 13:02:32 +0200
From:	Anders Berg <anders.berg@...gotech.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	Alexandre Courbot <gnurou@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] gpio: Add driver for AXM55xx SSP chip selects

On Sat, Sep 6, 2014 at 3:53 PM, Mark Brown <broonie@...nel.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
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