linux-kernel - Re: [PATCH 5/8] pinctrl-tz1090: add TZ1090 pinctrl driver

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Message-ID: <CACRpkdbJpnpZwoCqtFk+U9fsJXPLw+AhPBSCxawS2-QwAjBftA@mail.gmail.com>
Date:	Tue, 14 May 2013 13:52:34 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	James Hogan <james.hogan@...tec.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Herring <rob.herring@...xeda.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Rob Landley <rob@...dley.net>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH 5/8] pinctrl-tz1090: add TZ1090 pinctrl driver

On Fri, May 3, 2013 at 5:06 PM, James Hogan <james.hogan@...tec.com> wrote:
> [me]
>> Thus this part of the problem (poking that "select" bit)
>> should be handled by the pinmux part of the driver.
>>
>> The pinconf part does not need to know about it.
>
> Okay, so how would you recommend handling the case of a pin in a muxing
> pingroup that shouldn't be put into peripheral mode?
>
> E.g. imagine an 18bit display is wired to the (24bit) tft pins (which
> are muxed as a group to "tft" function), and the least significant tft
> pins are used as GPIOs to control something like board power supplies.
>
> Without using pinconf I think the muxing pingroups would have to overlap
> like below (is that acceptable?):

I don't know if I understand your example correctly but are you after
this part of the documentation from Documentation/pinctrl.txt:

Pinmux conventions
==================
(...)
  It is possible to map several groups to the same combination of device,
  pin controller and function. This is for cases where a certain function on
  a certain pin controller may use different sets of pins in different
  configurations.

Yours,
Linus Walleij
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