regulator: Support driver probe deferral

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>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index e9a83f84adaf53771d94bd3b3761deb7cad2ca32..fcde037b3461b26a882ac1ab6d044e30b355cfd3 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1210,7 +1210,7 @@ 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(-EPROBE_DEFER);
        const char *devname = NULL;
        int ret;
 
@@ -2834,7 +2834,7 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
 
                if (!r) {
                        dev_err(dev, "Failed to find supply %s\n", supply);
-                       ret = -ENODEV;
+                       ret = -EPROBE_DEFER;
                        goto scrub;
                }