PWM backlight build warning

[Mark Brown]

On Sun, Apr 07, 2013 at 06:33:35AM +1200, Tony Prisk wrote:

> The problem occurs because when CONFIG_PM=y but CONFIG_PM_SLEEP=n:

> I guess this would be a problem on every driver that has been
> converted to SIMPLE_DEV_PM_OPS.
> I don't know enough about the PM code to offer a fix, or whethermy
> chosen config is just 'invalid'.

You just need to put the system suspend functions inside an ifdef
CONFIG_PM_SLEEP instead of CONFIG_PM.
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