> This means dev_pm_domain_start() is needed only for the SDHI renesas
> variants. But on the other hand, it doesn't hurt for the others (the
> uniphier-sd variant doesn't even use runtime PM as confirmed by
> Yamada-san).
> 
> I don't have a strong opinion, but it looks like we can either apply
> $subject patch as is, or modify it to make dev_pm_domain_start() be
> called only for the SDHI renesas variants.
> 
> What do you prefer?

Dealing with PM is confusing often enough. To keep it simple, I'd
suggest to avoid unneeded calls. It may take a while later to rediscover
if this call is essential or not. So, for the uniphier case, we know it
is not needed. If we agree on a best effort basis that it is also not
needed for tmio_mmc, then I think we should keep it only for Renesas
SDHI.