linux-kernel - Re: pinctrl discussions @ Linaro Connect, and also requesting GPIOs

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Message-ID: <CAJuYYwQJaRZQ+fEZBfujyuoVNBVf8167cbfnX6JqhvVzrJmrYQ@mail.gmail.com>
Date:	Sat, 12 Nov 2011 20:17:29 +0530
From:	Thomas Abraham <thomas.abraham@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Stephen Warren <swarren@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>
Subject: Re: pinctrl discussions @ Linaro Connect, and also requesting GPIOs

On 12 November 2011 19:49, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Sat, Nov 12, 2011 at 12:22 PM, Thomas Abraham
> <thomas.abraham@...aro.org> wrote:
>
>> Another question, not related to the above. The gpio and pinctrl
>> drivers would operate on the same physical memory space (pinmux and
>> gpio is just a single controller). Both gpio and pinctrl driver would
>> do a ioremap of this physical address space. I remember reading that
>> ioremap of the same physical memory area twice is not correct. So any
>> suggestions on how to handle this.
>
> Yes, create one single driver in a single file that presents a pinctrl *and*
> a gpiolib interface. Put the driver in drivers/pinctrl/pinctrl-foo.c.
> That's the most natural design pattern methinks. Trying to artificially
> break it apart in two driver files doesn't make sense.

Yes, this seems better (and additional work). I will try it out.
Meanwhile, I will post a simplistic exynos4 pinctrl driver patch, just
to ensure it is headed in the right direction.

Thanks,
Thomas.

>
> Linus Walleij
>
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