linux-kernel - Re: [PATCH] mfd: palmas: Add DVFS mux setting

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Date:	Fri, 26 Jul 2013 16:03:23 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Andrew Chew <AChew@...dia.com>
CC:	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ian.campbell@...rix.com" <ian.campbell@...rix.com>,
	"rob@...dley.net" <rob@...dley.net>,
	"sameo@...ux.intel.com" <sameo@...ux.intel.com>,
	"lee.jones@...aro.org" <lee.jones@...aro.org>,
	"grant.likely@...aro.org" <grant.likely@...aro.org>,
	"ian@...mlogic.co.uk" <ian@...mlogic.co.uk>,
	"j-keerthy@...com" <j-keerthy@...com>,
	"gg@...mlogic.co.uk" <gg@...mlogic.co.uk>,
	Laxman Dewangan <ldewangan@...dia.com>,
	Rhyland Klein <rklein@...dia.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mfd: palmas: Add DVFS mux setting

On 07/26/2013 03:50 PM, Andrew Chew wrote:
>>>> How does this interact with the pinctrl driver that Laxman just sent
>>>> for Palmas?
>>>>
>>>> https://lkml.org/lkml/2013/7/26/141
>>>> [PATCH 0/2] pinctrl: palmas: add pincontrol driver
>>>
>>> Thanks for pointing this out.  Given this:
>>>
>>> +Optional properties:
>>> +- ti,palams-enable-dvfs1: Enable DVFS1. Configure pins for DVFS1 mode.
>>> +- ti,palams-enable-dvfs2: Enable DVFS2. Configure pins for DVFS2 mode.
>>>
>>> I think his work already encompasses what my patch is supposed to do.
>>>
>>> Abandoning this patch.
>>
>> OK, that's simple!
>>
>> Are the existing ti,mux-pad1/ti,mux-pad2 properties already in the binding
>> redundant with Laxman's pinctrl driver?
> 
> In linux-next (where I based my work), yes, those two properties already exist,
> and as far as I understand it, are redundant with Laxman's pinctrl driver.
> I expect those properties will go away with Laxman's pinctrl driver.

Except those properties have been there for many kernel revisions and
are an ABI and hence can't be removed, although I noticed that they got
renamed recently, and of course we aren't technically being strict about
this quite yet...

Re: the complete pinctrl driver: is anything outside the Palmas going to
need to reprogram the Palmas pinctrl HW at run-time? Are the functions
that can be routed to the pins just static configuration for PMIC
features, or might other generic (non-Palmas) drivers use those pins for
something? If not, perhaps it's be simpler to just add your ti,mux-pad3
property and be done.
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