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

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Date:	Fri, 6 Jan 2012 09:23:35 -0800
From:	Stephen Warren <swarren@...dia.com>
To:	Dong Aisheng-B29396 <B29396@...escale.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:	"linus.walleij@...ricsson.com" <linus.walleij@...ricsson.com>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"cjb@...top.org" <cjb@...top.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>
Subject: RE: [RFC PATCH v3 2/5] pinctrl: add dt binding support for pinmux
 mappings

Dong Aisheng-B29396 wrote at Friday, January 06, 2012 3:51 AM:
> Stephen Warren wrote at Friday, January 06, 2012 7:38 AM:
> > Dong Aisheng-B29396 wrote at Tuesday, December 27, 2011 7:41 AM:
...
> > > But what about the pin maps without device associated?
> >
> > Indeed; that's why I'd tend towards defining a table of pinmux usage in the
> > pinmux node, and having other devices refer to that table.
>
> Currently we still prefer to use device node relationship to reflect the pinmux
> map if we can since as you said pinmux map is little depending on the pinctrl
> subsystem implementation.
> And I'm trying to do it now.
> 
> > Still, if the pinmux definitions are in the device nodes, we could simply make
> > the pinmux controller have such a definition itself too, for the "system hog"
> > case.
>
> Yes, that way I think is like:
> iomuxc@...e0000 {
>         pinctrl_uart4: uart4 {
>                 grp-pins = <107 108>;
>                 grp-mux = <4 4>;
> 		   hog_on_boot;
>         };
> }

If pinmux usage is defined in each individual device node, and the "hog"
setup is included in the pinmux controller's own device node, then there's
no need for a "hog_on_boot" property; any pinmux setup node that's inside
the pinmux controller node would automatically be a "hog" entry, and
could be activated as soon as the pinmux controller was probed and
registered with the pinctrl subsystem.

(as a minor nit, DT usually uses - not _ in property names, so that would
be "hog-on-boot").

-- 
nvpublic

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