Re: [PATCH] PM / Domains: If an OF node is found but no device probed yet, defer.

["Rafael J. Wysocki" <rjw@rjwysocki.net>]

More CCes.

On Wednesday, March 11, 2015 08:27:28 AM Eric Anholt wrote:
> If we've declared a power domain in the OF, and the OF node is found
> but the requested domain hasn't been registered on it yet, then we
> probably have just tried to probe before the power domain driver has.
> Defer our device's probe until it shows up.
> 
> Signed-off-by: Eric Anholt <eric@anholt.net>

Kevin, Ulf, any chance to have a look at this, please?

> ---
> 
> I ran into this when turning my ad-hoc code for BCM2835 (Raspberry Pi)
> USB poweron support in the DWC2 controller to an OF-based power domain
> declaration.
> 
> drivers/base/power/domain.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
> index ba4abbe..2b93c98 100644
> --- a/drivers/base/power/domain.c
> +++ b/drivers/base/power/domain.c
> @@ -2064,7 +2064,7 @@ EXPORT_SYMBOL_GPL(of_genpd_del_provider);
>  struct generic_pm_domain *of_genpd_get_from_provider(
>  					struct of_phandle_args *genpdspec)
>  {
> -	struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
> +	struct generic_pm_domain *genpd = ERR_PTR(-EPROBE_DEFER);
>  	struct of_genpd_provider *provider;
>  
>  	mutex_lock(&of_genpd_mutex);
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.