linux-kernel - Re: [PATCH V3 4/7] pinctrl: API changes to support multiple states per device

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Date:	Mon, 5 Mar 2012 16:03:02 +0800
From:	Dong Aisheng <aisheng.dong@...escale.com>
To:	Stephen Warren <swarren@...dia.com>
CC:	Linus Walleij <linus.walleij@...aro.org>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Dong Aisheng-B29396 <B29396@...escale.com>,
	"s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"dongas86@...il.com" <dongas86@...il.com>,
	"shawn.guo@...aro.org" <shawn.guo@...aro.org>,
	"thomas.abraham@...aro.org" <thomas.abraham@...aro.org>,
	"tony@...mide.com" <tony@...mide.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 4/7] pinctrl: API changes to support multiple states
 per device

On Sat, Mar 03, 2012 at 04:05:47AM +0800, Stephen Warren wrote:
> The API model is changed from:
> 
> p = pinctrl_get(dev, "state1");
> pinctrl_enable(p);
> ...
> pinctrl_disable(p);
> pinctrl_put(p);
> p = pinctrl_get(dev, "state2");
> pinctrl_enable(p);
> ...
> pinctrl_disable(p);
> pinctrl_put(p);
> 
> to this:
> 
> p = pinctrl_get(dev);
> s1 = pinctrl_lookup_state(p, "state1");
> s2 = pinctrl_lookup_state(p, "state2");
> pinctrl_select_state(p, s1);
> ...
> pinctrl_select_state(p, s2);
> ...
> pinctrl_put(p);
> 
> This allows devices to directly transition between states without
> disabling the pin controller programming and put()/get()ing the
> configuration data each time. This model will also better suit pinconf
> programming, which doesn't have a concept of "disable".
> 
> The special-case hogging feature of pin controllers is re-written to use
> the regular APIs instead of special-case code. Hence, the pinmux-hogs
> debugfs file is removed; see the top-level pinctrl-handles files for
> equivalent data.
> 
> Signed-off-by: Stephen Warren <swarren@...dia.com>
> ---
> v3: Rebased. No logical changes.
> v2: Make use of PINCTRL_STATE_DEFAULT, split out some documentation
> cleanup into an earlier patch. Various minor fixes. Fixes due to
> rebasing on updated earlier patches. Remove usecount field from struct
> pinctrl; allow only one concurrent pinctrl_get() per device.
> ---
Acked-by: Dong Aisheng <dong.aisheng@...aro.org>

I already acked it in v2, since no changes, ack it again. :-)

Regards
Dong Aisheng

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