linux-kernel - Re: [PATCH 00/11] drivers: Add Pinctrl PM support

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Message-ID: <CACRpkdYnhjpFp1CM=P_hddBe4qVigtE0c+CN9NKvk3nFgJS-ig@mail.gmail.com>
Date:	Tue, 4 Jun 2013 09:25:02 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Hebbar Gururaja <gururaja.hebbar@...com>,
	Kevin Hilman <khilman@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vaibhav Bedia <vaibhav.bedia@...com>, sudhakar.raj@...com
Subject: Re: [PATCH 00/11] drivers: Add Pinctrl PM support

On Fri, May 31, 2013 at 7:04 PM, Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:

> As with the original introduction of pinctrl states my question is: "Can
> all of this be handled in the driver/bus core instead of adding a lot
> of boilerplate code to the individual drivers".

It can. Per the suggestion in 2/11:

- Adding pins_sleep and pins_idle to struct dev_pin_info
  in include/linux/pinctrl/devinfo.h

- Modify drivers/base/pinctrl.c to optionally look up
  sleep and idle states, you can make that code
  #ifdef CONFIG_PM I think.

- Add something like static inline functions to
  include/linux/pinctrl/consumer.h
  with names like pinctrl_select_pm_idle(struct device *)
  pinctrl_select_pm_sleep(struct device *) to switch states
  using the device core containers, and includes
  checking IS_ERR() on the handles etc.

I think this will save a *lot* of identical code in all the
drivers, that will just have to call
pinctrl_select_pm_sleep(), pinctrl_select_pm_default()
pinctrl_select_pm_idle() instead of all the complex code.

This is what I planned to do but never got around to.

Yours,
Linus Walleij
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