linux-kernel - Re: [PATCH] ARM: exynos: Select PINCTRL

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Message-id: <1614776.P66h1VoFPp@amdc1227>
Date:	Thu, 09 May 2013 11:45:10 +0200
From:	Tomasz Figa <t.figa@...sung.com>
To:	Olof Johansson <olof@...om.net>
Cc:	Doug Anderson <dianders@...omium.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Simon Glass <sjg@...omium.org>,
	Alim Akhtar <alim.akhtar@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-samsung-soc@...r.kernel.org" 
	<linux-samsung-soc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: exynos: Select PINCTRL_EXYNOS for exynos5

Hi Doug, Olof,

On Wednesday 08 of May 2013 12:33:34 Olof Johansson wrote:
> Hi,
> 
> On Wed, May 8, 2013 at 11:48 AM, Doug Anderson <dianders@...omium.org> 
wrote:
> > Olof,
> > 
> > On Wed, May 8, 2013 at 11:19 AM, Olof Johansson <olof@...om.net> wrote:
> >> Seems like this should be selected by the SoC (ARCH_EXYNOS5) instead
> >> of the board. Actually, I'm not sure we need the board Kconfig entry
> >> long-term; all boards will be dt-only.
> > 
> > Good point.  Hopefully someone at Samsung can work on removing the
> > board itself?  If you'd like me to take this on then let me know and I
> > can put it on my list.
> 
> Nothing stops you from doing that on your own. I tend to push back
> onto the maintainers to get them engaged in their own housekeeping,
> but anyone is free to :)
> 
> > I'm happy to resubmit my patch under ARCH_EXYNOS5.  I'll move the
> > exynos4 one at the same time.
> 
> Great.
> 
> > I'm going to make the assumption that PINCTRL_EXYNOS and
> > PINCTRL_EXYNOS5440 can happily coexist.  Certainly I've got both
> > defined in my tree right now and nothing blows up.  I haven't tested
> > on 5440 but things ought to be handled by "compatible" checks, right?
> 
> Yes, if they can't coexist then that's a bug.
> 
> > I'll also assume that eventually someone will move PINCTRL_EXYNOS5440
> > into PINCTRL_EXYNOS.  If PINCTRL_EXYNOS5440 won't eventually move
> > under PINCTRL_EXYNOS then it makes less sense to define PINCTRL_EXYNOS
> > for all exynos parts.
> 
> Yeah, it should -- this is just in transition since 5440 was first out
> of the gate with pinctrl.

AFAIK, Exynos5440 contains a completely different pin controller block, which 
is not compatible with pinctrl-samsung driver, so I don't see any point of 
moving it under PINCTRL_EXYNOS, which is currently used for Exynos 4210, 4x12 
and 5250, but will be also extended with driver data for S5PV210 as well.

I'd say that CPU_EXYNOS4210, SOC_EXYNOS4212, SOC_EXYNOS4412 and SOC_EXYNOS5250 
should select PINCTRL_EXYNOS and SOC_EXYNOS5440 should be left as is, 
selecting PINCTRL_EXYNOS5440.

Best regards,
-- 
Tomasz Figa
Samsung Poland R&D Center
SW Solution Development, Kernel and System Framework

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