[PATCH v4 2/3] PM: domains: Make of_genpd_add_subdomain() to return -EPROBE_DEFER

[Dmitry Osipenko]

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 <pgwipeout@xxxxxxxxx>
Tested-by: Nicolas Chauvet <kwizart@xxxxxxxxx>
Tested-by: Matt Merhar <mattmerhar@xxxxxxxxxxxxxx>
[tested on NVIDIA Tegra20/30/124 SoCs]
Suggested-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Reviewed-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
 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 0bd0cdc30393..def1299ad085 100644
--- a/drivers/base/power/domain.c
+++ b/drivers/base/power/domain.c
@@ -2466,7 +2466,7 @@ 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);
 
-- 
2.29.2