PM: domains: Make of_genpd_add_subdomain() return -EPROBE_DEFER

Driver of a power domain provider may not be ready at the time of
of_genpd_add_subdomain() invocation. Make this function to return
-EPROBE_DEFER instead of -ENOENT in order to remove a need from
power domain drivers to handle the error code specially.

Tested-by: Peter Geis <[email protected]>
Tested-by: Nicolas Chauvet <[email protected]>
Tested-by: Matt Merhar <[email protected]>
[tested on NVIDIA Tegra20/30/124 SoCs]
Suggested-by: Ulf Hansson <[email protected]>
Reviewed-by: Ulf Hansson <[email protected]>
Reviewed-by: Viresh Kumar <[email protected]>
Signed-off-by: Dmitry Osipenko <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/base/power/domain.c b/drivers/base/power/domain.c
index 4878c824e66c..c615abf56c52 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2496,7 +2496,7 @@ int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
 out:
 	mutex_unlock(&gpd_list_lock);
 
-	return ret;
+	return ret == -ENOENT ? -EPROBE_DEFER : ret;
 }
 EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);