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regulator: Support driver probe deferral

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If we fail to locate a requested regulator return -EPROBE_DEFER. 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.  In the unusual case where a driver doesn't want this
it can override the default behaviour.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Liam Girdwood <lrg@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mark Brown 2012-03-11 13:07:56 +00:00 • committed by Greg Kroah-Hartman
commit 04bf30115f
1 changed files with 2 additions and 2 deletions
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4
drivers/regulator/core.c
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@ -1210,7 +1210,7 @@ static struct regulator *_regulator_get(struct device *dev, const char *id,
{ {
struct regulator_dev *rdev; struct regulator_dev *rdev;
struct regulator_map *map; struct regulator_map *map;
struct regulator *regulator = ERR_PTR(-ENODEV); struct regulator *regulator = ERR_PTR(-EPROBE_DEFER);
const char *devname = NULL; const char *devname = NULL;
int ret; int ret;
@ -2834,7 +2834,7 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
if (!r) { if (!r) {
dev_err(dev, "Failed to find supply %s\n", supply); dev_err(dev, "Failed to find supply %s\n", supply);
ret = -ENODEV; ret = -EPROBE_DEFER;
goto scrub; goto scrub;
} }