linux-kernel - Re: An extremely simplified pinctrl bindings proposal

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Date:	Mon, 06 Feb 2012 21:28:25 -0800
From:	Stephen Warren <swarren@...dia.com>
To:	Tony Lindgren <tony@...mide.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Dong Aisheng <dongas86@...il.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Dong Aisheng-B29396 <B29396@...escale.com>,
	"Sascha Hauer (s.hauer@...gutronix.de)" <s.hauer@...gutronix.de>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"cjb@...top.org" <cjb@...top.org>,
	"Simon Glass (sjg@...omium.org)" <sjg@...omium.org>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	"Grant Likely (grant.likely@...retlab.ca)" 
	<grant.likely@...retlab.ca>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: An extremely simplified pinctrl bindings proposal

On 02/06/2012 11:03 AM, Tony Lindgren wrote:
> * Linus Walleij <linus.walleij@...aro.org> [120206 08:58]:
>> On Mon, Feb 6, 2012 at 6:53 AM, Stephen Warren <swarren@...dia.com> wrote:
>>
>> I will certainly finalize the pinctrl subsystem as-is, adding the
>> pin configurations states as the last major piece. If for nothing
>> else it provides some understanding of the problem space.
>>
>> I think we should keep both for the time being and consider the
>> alternative approach when patches appear. So if/when someone
>> creates a new subsystem like this, drivers can move over to it on a
>> per-driver basis. If there are zero drivers left in pinctrl it can be
>> deleted.
> 
> Yes it seems that we can easily do both. So far the only
> change needed for pinctrl drivers containing no data is that
> we should make the string names optional and structure debugfs
> around the physical register addresses instead. I'm basically
> just setting the mux register physcal address as the pin name
> for now to work around this.

I was thinking that since there was just a plain list of register
writes, there wouldn't be any concept of pins, groups, functions, etc.
at all. As such, it wouldn't really fit into pinctrl as-is; it'd need to
be either something separate, or pinctrl to change substantially more
than just allowing unnamed pins, wouldn't it?

-- 
nvpublic
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