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

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Message-Id: <1426087648-3862-1-git-send-email-eric@anholt.net>
Date:	Wed, 11 Mar 2015 08:27:28 -0700
From:	Eric Anholt <eric@...olt.net>
To:	linux-kernel@...r.kernel.org
Cc:	Tomasz Figa <tomasz.figa@...il.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Eric Anholt <eric@...olt.net>
Subject: [PATCH] PM / Domains: If an OF node is found but no device probed yet, defer.

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@...olt.net>
---

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);
-- 
2.1.4

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