linux-kernel - Re: [PATCH 2/7] pinctrl: pinconf-generic: Infer map type from DT property

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Date:	Wed, 5 Nov 2014 10:09:35 -0800
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Michal Simek <michal.simek@...inx.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Alessandro Rubini <rubini@...pv.it>,
	Heiko Stuebner <heiko@...ech.de>,
	<linux-rockchip@...ts.infradead.org>, <linux-sh@...r.kernel.org>
Subject: Re: [PATCH 2/7] pinctrl: pinconf-generic: Infer map type from DT
 property

On Wed, 2014-11-05 at 03:56PM +0200, Laurent Pinchart wrote:
> Hi Soren,
> 
> Thank you for the patch.
> 
> On Monday 03 November 2014 11:05:26 Soren Brinkmann wrote:
> > With the new 'groups' property, the DT parser can infer the map type
> > from the fact whether 'pins' or 'groups' is used to specify the pin
> > group to work on.
> > To maintain backwards compatibitliy with current usage of the DT
> > binding, this is only done when an invalid map type is passed to the
> > parsing function.
> 
> The Renesas PFC implements similar bindings with using the vendor-specific 
> properties "renesas,pins" and "renesas,groups" (bindings and implementation 
> available at Documentation/devicetree/bindings/pinctrl/renesas,pfc-pinctrl.txt 
> and drivers/pinctrl/sh-pfc/pinctrl.c respectively).
> 
> The Renesas implementation is a bit more generic in that it allows both pins 
> and groups to be specified in a single subnode. Do you think that feature 
> would make sense for pinconf-generic as well ?

I don't have a use-case for that. I guess if somebody needs this kind of
functionality it could be added later. I would like to avoid blocking
pinctrl-zynq on adding more features here.

	Thanks,
	Sören
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