linux-kernel - Re: [PATCH v2 02/11] arm: pxa27x: support ICP DAS LP-8x4x

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Message-ID: <CACRpkdZpwPhscWG_j-BM9bRZL-J7dRoX4=Q+Eo5Td9We6qvH0w@mail.gmail.com>
Date:	Thu, 12 Dec 2013 21:07:13 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Vasily Khoruzhick <anarsoul@...il.com>
Cc:	Sergei Ianovich <ynvich@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Haojian Zhuang <haojian.zhuang@...il.com>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Eric Miao <eric.y.miao@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Bjorn Andersson <Bjorn.Andersson@...ymobile.com>
Subject: Re: [PATCH v2 02/11] arm: pxa27x: support ICP DAS LP-8x4x

On Tue, Dec 10, 2013 at 1:54 PM, Vasily Khoruzhick <anarsoul@...il.com> wrote:
> On Tue, Dec 10, 2013 at 3:43 PM, Linus Walleij <linus.walleij@...aro.org> wrote:

>> Argh! Now you're adding another user for a legacy custom pin control
>> implementation. But if noone is going to modernize PXA2xx what
>> can we do :-/
>
> I tried a ~year ago, but it's not so trivial. PXA2xx has no separate
> pin control module, it's
> highly integrated into GPIO controller. I've asked the maillist what
> should I do for that case, but AFAIR no one answered.

It is very common for pin controllers and GPIO blocks to
be integrated.

The usual solution is to make a combined driver that registers
both pinctrl and GPIO interfaces and put that into
drivers/pinctrl.

Here is a recent example that can be used as inspiration:
http://marc.info/?l=linux-doc&m=138629591206248&w=2

Yours,
Linus Walleij
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