netdev - Re: [PATCH v5 6/8] net: can: c_can: Disable pins when CAN interface is down

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Message-ID: <CACRpkdZoLgwwMbCL1yEQPVqM1Q9NYEYGySZW12xxm4zH3Fbi+Q@mail.gmail.com>
Date:	Thu, 27 Nov 2014 14:28:30 +0100
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Roger Quadros <rogerq@...com>
Cc:	Marc Kleine-Budde <mkl@...gutronix.de>, wg@...ndegger.com,
	Wolfram Sang <wsa@...-dreams.de>,
	Tony Lindgren <tony@...mide.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Mugunthan V N <mugunthanvnm@...com>,
	George Cherian <george.cherian@...com>,
	Felipe Balbi <balbi@...com>, Sekhar Nori <nsekhar@...com>,
	Nishanth Menon <nm@...com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Linux-OMAP <linux-omap@...r.kernel.org>,
	linux-can@...r.kernel.org,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v5 6/8] net: can: c_can: Disable pins when CAN interface
 is down

On Fri, Nov 14, 2014 at 2:43 PM, Roger Quadros <rogerq@...com> wrote:
> On 11/13/2014 06:03 PM, Marc Kleine-Budde wrote:
>> On 11/13/2014 04:23 PM, Roger Quadros wrote:

>> I just stumbled over pinctrl_pm_select_sleep_state(), is it possible to
>> integrate this into runtime pm?
>>
>> http://lxr.free-electrons.com/source/drivers/pinctrl/core.c#L1282
>
> I think those functions are there for the same reason but not sure why aren't
> they used in runtime pm core.
>
> Linus W. any hints?

It is not used from PM core because there are cases where
you may want to put pins to sleep for completely PM-core
unrelated things.

Things like turning off a serial port from userspace,
for example. That should put the pins to sleep.

Yours,
Linus Walleij
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