linux-kernel - Re: [PATCH] Switch atmel_serial to dev_pm

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Message-Id: <200908031820.42760.elendil@planet.nl>
Date:	Mon, 3 Aug 2009 18:20:41 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Albin Tonnerre <albin.tonnerre@...e-electrons.com>
Cc:	haavard.skinnemoen@...el.com, nicolas.ferre@...el.com,
	linux@...im.org.za, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Switch atmel_serial to dev_pm_ops

Albin Tonnerre wrote:
>> Why not
> 
>> #define atmel_serial_pm_ops   NULL
> 
> Because the .pm field is set to the address of atmel_serial_pm_ops, and
> iirc taking the address of NULL is not allowed.

The following construction is possible however (first used by Magnus Damm 
for some of the SuperH drivers):

#ifdef CONFIG_PM
[...]
#define DRIVER_PM_OPS (&driver_pm_ops)
#else
#define DRIVER_PM_OPS NULL
#endif

...
      .driver = {
...
             .pm = DRIVER_PM_OPS,
      }
...

Cheers,
FJP
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