[PATCH RESEND] regulator: Add stub for devm_regulator_get_exclusive

[Mark Brown]

On Thu, Oct 09, 2014 at 07:14:18PM +0800, Axel Lin wrote:
> Also makes regulator_get_exclusive and devm_regulator_get_exclusive stub
> functions return error pointer.
> 
> Signed-off-by: Axel Lin <axel.lin at ingics.com>
> ---
> Hi Mark,
> I hit below build error and then found this patch is still not yet upstream.
> So here is a resend.
> 
>   CC [M]  drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.o
> drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c: In function 'mdp4_kms_init':
> drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c:384:2: error: implicit declaration of function 'devm_regulator_get_exclusive' [-Werror=implicit-function-declaration]
> drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c:384:16: error: assignment makes pointer from integer without a cast [-Werror]

To be honest the fact that you're hitting bugs with this is kind of
making me think that this is a good idea.  

Looking at the code in the driver there are rather a lot of problems -
the whole way the errors are ignored in the probe function is concerning
and most likely buggy at least with deferred probe. For the immediate
problem with using regulator_get_exclusive() I can't understand why it's
being used at all.  In general all the regulator usage in the driver is
atypical and doesn't look idiomatic - do we understand what's going on
here?
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