linux-kernel - Re: [RFC 3/3] ARM: e3xx: Add header file for pinctrl constants

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Message-ID: <4489852.SMA0lELne9@wuerfel>
Date:	Fri, 06 Nov 2015 21:28:53 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Moritz Fischer <moritz.fischer@...us.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>, devicetree@...r.kernel.org
Subject: Re: [RFC 3/3] ARM: e3xx: Add header file for pinctrl constants

On Friday 06 November 2015 09:55:28 Moritz Fischer wrote:
> On Fri, Nov 6, 2015 at 8:42 AM, Arnd Bergmann <arnd@...db.de> wrote:
> > On Friday 06 November 2015 08:01:25 Moritz Fischer wrote:
> >> pins = E31X_TX_BANDSEL_2;
> >> output-low;
> >>
> >> in one .dts, while having something like
> >>
> >> pins = E33X_TX_BANDSEL_2
> >> output low;
> >>
> >> in the second dts
> >
> > That doesn't seem helpful though, because the assignment of the
> > pins is not hidden from the source file that should be documenting
> > it: if someone wants to know how the pins are muxed, they now have
> > to cross-reference the dts file with the header. If you just put the
> > pin number directly into the dts, it becomes completely clear
> > what the setting is.
> 
> Just to clarify, you're suggesting using "DB_0" etc in the dts file?
> At that point
> the name becomes kinda useless. I found the PINCTRL_PIN_ANON macro,
> but haven't found any use throughout the tree, is using it discouraged?

I don't know if that is the best approach, but it's better than using
macros here. You should only add a header file with macros if you
absolutely have to define a common namespace between the driver and the
dts files, but you don't do that here: the header file is only used
in one place.

	Arnd
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