Re: [PATCH mfd-next] mfd: max14577 and sec: add PM_SLEEP dependency to suspend/resume

[Krzysztof Kozlowski <k.kozlowski@samsung.com>]

On Tue, 2013-12-17 at 09:53 +0000, Lee Jones wrote:
> On Tue, 17 Dec 2013, Krzysztof Kozlowski wrote:
> 
> > Add CONFIG_PM_SLEEP dependency to suspend and resume functions of
> > max14577 MFD driver and sec-core.c code.
> > 
> > This fixes the warnings:
> > drivers/mfd/max14577.c:176:12: warning: ‘max14577_suspend’ defined but not used [-Wunused-function]
> > drivers/mfd/max14577.c:199:12: warning: ‘max14577_resume’ defined but not used [-Wunused-function]
> > drivers/mfd/sec-core.c:347:12: warning: ‘sec_pmic_suspend’ defined but not used [-Wunused-function]
> > drivers/mfd/sec-core.c:369:12: warning: ‘sec_pmic_resume’ defined but not used [-Wunused-function]
> > 
> > Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> > ---
> >  drivers/mfd/max14577.c |    2 ++
> >  drivers/mfd/sec-core.c |    2 ++
> >  2 files changed, 4 insertions(+)
> > 
> > diff --git a/drivers/mfd/max14577.c b/drivers/mfd/max14577.c
> > index a5e1c370c609..1018a6644469 100644
> > --- a/drivers/mfd/max14577.c
> > +++ b/drivers/mfd/max14577.c
> > @@ -173,6 +173,7 @@ static const struct i2c_device_id max14577_i2c_id[] = {
> >  };
> >  MODULE_DEVICE_TABLE(i2c, max14577_i2c_id);
> >  
> > +#ifdef CONFIG_PM_SLEEP
> >  static int max14577_suspend(struct device *dev)
> >  {
> >  	struct i2c_client *i2c = container_of(dev, struct i2c_client, dev);
> > @@ -208,6 +209,7 @@ static int max14577_resume(struct device *dev)
> >  
> >  	return 0;
> >  }
> > +#endif /* CONFIG_PM_SLEEP */
> 
> Is this the best way we have of doing this?
> 
> Isn't there a helper which casts these to NULL if unused?

If you are referring to SIMPLE_DEV_PM_OPS then this is already used in
these drivers. It didn't come up in the patch diff because the
SIMPLE_DEV_PM_OPS are used after the line:
static struct of_device_id max14577_dt_match[]


Best regards,
Krzysztof