linux-kernel - Re: [PATCH 3/3] i2c/at91: adopt pinctrl support

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Date:	Mon, 20 Oct 2014 11:17:43 -0700
From:	Kevin Hilman <khilman@...nel.org>
To:	Wenyou Yang <wenyou.yang@...el.com>
Cc:	<wsa@...-dreams.de>, <ludovic.desroches@...el.com>,
	<linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<nicolas.ferre@...el.com>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/3] i2c/at91: adopt pinctrl support

Wenyou Yang <wenyou.yang@...el.com> writes:

> Amend the i2c at91 pin controller to optionally take a pin control
> handle and set the state of the pins to:
>
> - "default" on boot, resume and before performing an transfer
> - "sleep" on suspend()
>
> This should make it possible to optimize energy usage for the pins
> both for the suspend/resume cycle
>
> Signed-off-by: Wenyou Yang <wenyou.yang@...el.com>

This patch is a good example of why you should just have the ->suspend
function call the same function as ->runtime_suspend.

If you do that, rather than having to add the pinctrl_pm* calls bo both
system PM and runtime PM functions, you could've just added them to the
runtime PM functions.

Kevin
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