linux-kernel - Re: [PATCH v4 2/6] pinctrl: berlin: add the berlin4ct pinctrl driver

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Message-ID: <20151009172238.68fdd51c@xhacker>
Date:	Fri, 9 Oct 2015 17:22:38 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Antoine Tenart <antoine.tenart@...e-electrons.com>
CC:	<sebastian.hesselbarth@...il.com>, <linus.walleij@...aro.org>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<mark.rutland@....com>, <robh+dt@...nel.org>, <pawel.moll@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-gpio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/6] pinctrl: berlin: add the berlin4ct pinctrl
 driver

Hi Antoine,

On Fri, 9 Oct 2015 11:03:53 +0200
Antoine Tenart <antoine.tenart@...e-electrons.com> wrote:

> Hi Jisheng,
> 
> On Fri, Oct 09, 2015 at 04:17:05PM +0800, Jisheng Zhang wrote:
> > diff --git a/drivers/pinctrl/berlin/Kconfig b/drivers/pinctrl/berlin/Kconfig
> > index b18322b..c13f6d2 100644
> > --- a/drivers/pinctrl/berlin/Kconfig
> > +++ b/drivers/pinctrl/berlin/Kconfig
> > @@ -17,4 +17,9 @@ config PINCTRL_BERLIN_BG2Q
> >  	bool
> >  	select PINCTRL_BERLIN
> >  
> > +config PINCTRL_BERLIN_BG4CT
> > +	depends on OF && (ARCH_BERLIN || COMPILE_TEST)
> > +	bool "Marvell berlin4ct pin controller driver"
> > +	select PINCTRL_BERLIN
> > +
> >  endif
> 
> This endif ends the following condition:
> 
> 	if ARCH_BERLIN
> 	[...]
> 
> So the "depends on ARCH_BERLIN" here can be dropped. Also the
> COMPILE_TEST can be moved as it isn't BG4CT specific and all other
> Berlin pinctrl drivers would benefit from this.
> 
> So we would have something like:
> 
> 	if (ARCH_BERLIN || COMPILE_TEST)

Oh yeah! This is better.

> 	[...]
> 	endif
> 
> Finally you can move the OF dependency to the PINCTRL_BERLIN config as
> all Berlin pinctrl drivers depends on it.

PINCTRL_BERLIN isn't user visible and it's selected by PINCTRL_BERLIN_BG4CT. So
we may have the following random config case:

CONFIG_OF=n
CONFIG_PINCTRL_BERLIN_BG4CT=y

In this case, there will be build errors for we missed OF. So we have to
make PINCTRL_BERLIN_BG4CT depends on OF. What do you think? Or is there
better solution?

Thanks for kind review,
Jisheng

> 
> Thanks!
> 
> Antoine
> 

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