linux-kernel - Re: [RFC PATCH v3 2/5] pinctrl: add dt binding support for pinmux mappings

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Date:	Thu, 12 Jan 2012 07:01:12 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Dong Aisheng-B29396 <B29396@...escale.com>,
	Dong Aisheng <dongas86@...il.com>,
	"linus.walleij@...ricsson.com" <linus.walleij@...ricsson.com>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"cjb@...top.org" <cjb@...top.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v3 2/5] pinctrl: add dt binding support for pinmux
 mappings

On Wed, Jan 11, 2012 at 11:41:56AM -0800, Stephen Warren wrote:
> Shawn Guo wrote at Tuesday, January 10, 2012 6:05 AM:
> > On Tue, Jan 10, 2012 at 08:21:05AM +0000, Dong Aisheng-B29396 wrote:
> > > Here what I wonder is that do we need to allow the platform to use a func-name
> > > property in their pinmux func node or pinmux group node to specify the name.
> > 
> > I do not see the necessity.
> > 
> > > If it is allowed, then it could be flexible for soc to define their names.
> > > If not there may be limitations on their node names since we can only get it from
> > > the node name.
> > 
> > To me, the node name is perfectly fine to be used for that purpose.
> 
> I'd prefer if we could use integers over strings if at all possible, but
> that does have a dependency on dtc getting a syntax to define named
> constants, or the kernel pre-processing the .dts files before passing
> them to dtc.
> 
> But if we have to use strings, I will point out that the pin names I
> chose for Tegra may not be suitable as DT node names; I don't /think/
> the DT node names can contain spaces, but I chose to name the Tegra
> pinctrl pins after both their pin name and GPIO name so that it's
> easier to correlate the two:
> 
>         PINCTRL_PIN(TEGRA_PIN_SDIO3_CLK_PA6, "SDIO3_CLK PA6"),
> 
> Now, I could change that, but I'd prefer not to.
> 
Hmm, we are talking about function name and pingroup name instead of
individual pin name. In your pinctrl-tegra20.c, they are .name and
.groups as below.

#define FUNCTION(fname)                                \
       {                                               \
               .name = #fname,                         \
               .groups = fname##_groups,               \
               .ngroups = ARRAY_SIZE(fname##_groups),  \
       }

-- 
Regards,
Shawn
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