linux-kernel - [PATCH] regulator: Support driver probe deferral

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Date:	Thu, 29 Sep 2011 12:11:01 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Liam Girdwood <lrg@...com>, Grant Likely <grant@...retlab.ca>
Cc:	linux-kernel@...r.kernel.org, patches@...nsource.wolfsonmicro.com,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: [PATCH] regulator: Support driver probe deferral

If we fail to locate a requested regulator return -EAGAIN. If drivers
pass this error code through to their caller (which they really should)
then this will ensure that the probe is retried later when further devices
become available.

Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
---

This depends on Grant's change to implement deferred probing, the error
code for which is going to change in the next revision.  Liam, if you're
also OK with this change I propose that we both ack it and let it get
carried along with the deferred probing change.

 drivers/regulator/core.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index d5656b7..b39ec9f 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1154,7 +1154,7 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
 {
 	struct regulator_dev *rdev;
 	struct regulator_map *map;
-	struct regulator *regulator = ERR_PTR(-ENODEV);
+	struct regulator *regulator = ERR_PTR(-EAGAIN);
 	const char *devname = NULL;
 	int ret;
 
@@ -2727,7 +2727,7 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
 		if (!found) {
 			dev_err(dev, "Failed to find supply %s\n",
 				init_data->supply_regulator);
-			ret = -ENODEV;
+			ret = -EAGAIN;
 			goto scrub;
 		}
 
-- 
1.7.6.3

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