linux-kernel - Re: [PATCH 1/3] drivers: pinctrl sleep and idle states in the core

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Message-ID: <51BA4158.906@wwwdotorg.org>
Date:	Thu, 13 Jun 2013 16:02:00 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Linus Walleij <linus.walleij@...ricsson.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Stephen Warren <swarren@...dia.com>,
	Kevin Hilman <khilman@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Hebbar Gururaja <gururaja.hebbar@...com>,
	Mark Brown <broonie@...nel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Wolfram Sang <wsa@...-dreams.de>
Subject: Re: [PATCH 1/3] drivers: pinctrl sleep and idle states in the core

On 06/11/2013 02:28 AM, Linus Walleij wrote:
> On Wed, Jun 5, 2013 at 7:22 PM, Stephen Warren <swarren@...dotorg.org> wrote:
> 
>>> diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
>>
>>> +int pinctrl_pm_select_default_state(struct device *dev)
>>
>>> +int pinctrl_pm_select_sleep_state(struct device *dev)
>>
>>> +int pinctrl_pm_select_idle_state(struct device *dev)
>>
>> The implementation of those 3 functions is basically identical. I'd be
>> inclined to move it to a helper function, and just pass (dev,
>> pins->xxx_state) to it.
> 
> Just to follow up on this now that I'm adding one more state.
> 
> I tried to create a refactoring patch for this but couldn't come
> up with anything apropriate along the lines above. For example
> this function:
...

Don't you just want something very roughly like:

int pinctrl_pm_select_xxx_state(struct device *dev,
		unsigned long offset, char *name)
{
	struct dev_pin_info *pins = dev->pins;
	struct pinctrl_state **s = (void *)(((char *)pins) + offset)
	int ret;

	if (!pins)
		return 0;
	if (IS_ERR(*s))
		return 0; /* No default state */
	ret = pinctrl_select_state(pins->p, *s);
	if (ret)
		dev_err(dev, "failed to activate %s pinctrl state\n",
			name);
	return ret;
}

int pinctrl_pm_select_default_state(struct device *dev)
{
    return pinctrl_pm_select_xxx_state(dev,
		offsetof(struct dev_pin_info, default_state),
		"default");
}

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