linux-kernel - Re: [PATCH 1/2] pinctrl: pinconf_generic: add utility functions for add map/configs

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Message-ID: <51F69A8F.2000802@wwwdotorg.org>
Date:	Mon, 29 Jul 2013 10:38:39 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Laxman Dewangan <ldewangan@...dia.com>
CC:	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"lee.jones@...aro.org" <lee.jones@...aro.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gg@...mlogic.co.uk" <gg@...mlogic.co.uk>,
	"kishon@...com" <kishon@...com>,
	Stephen Warren <swarren@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] pinctrl: pinconf_generic: add utility functions for
 add map/configs

On 07/27/2013 04:14 AM, Laxman Dewangan wrote:
> On Friday 26 July 2013 11:06 PM, Stephen Warren wrote:
>> On 07/26/2013 04:15 AM, Laxman Dewangan wrote:
>>> Some of pincontrol driver needs the utility function to create map
>>> list. The utility function needed for adding mux, configs etc.
>> Which other drivers already contain this code? Are you planning on
>> converting them over to use these new functions? The code looks
>> familiar, so I assume it's just cut/paste from Tegra with some renames,
>> so I didn't read it through in detail.
> 
> Yes, these functions are taken from the pinctrl-tegra driver. Other
> drivers which have similar implementation are nomadik, tegra, abx500,
> tz1090, tz1090-pdc.
> So All can use these utility function to avoid duplication and reduce
> code size.
> Yes, I have plan to use this in Tegra atleast but once this patch get
> accepted.
> 
> 
>>
>>>   drivers/pinctrl/pinconf-generic.c       |  105
>>> +++++++++++++++++++++++++++++++
>>>   include/linux/pinctrl/pinconf-generic.h |   52 +++++++++++++++
>> I don't think those are the correct files for this code. Presumably
>> there's no reason at all why a pinctrl driver that doesn't require
>> CONFIG_GENERIC_PINCONF can't use these basic utility functions. Perhaps
>> add a new pinctrl-utils file?
> 
> I thought generic implementation of parsing of dt is pinctrl-generic
> file and as these newly added APIs are require for the parsing the DT
> node, I added here.
> I can move this to pinctrl-util.c/h also.

pinctrl-generic isn't about DT, it's about defining generic options for
pin configuration rather than SoC-/driver-specific options for pin
configuration. (pin configuration being e.g. pull-up/down, bias
direction/strength, slew rate, etc.)

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