regulator: Allow regulator-regulator supplies to be specified by name

When one regulator supplies another allow the relationship to be specified
using names rather than struct regulators, in a similar manner to that
allowed for consumer supplies. This allows static configuration at compile
time, reducing the need for dynamic init code.

Also change the references to LINE supply to be system supply since line
is sometimes used for actual supplies and therefore potentially confusing.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 30 insertions, 0 deletions

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 51cf2bb37438..eb112d961515 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2328,7 +2328,37 @@ struct regulator_dev *regulator_register(struct regulator_desc *regulator_desc,
                 goto scrub;
 
         /* set supply regulator if it exists */
+        if (init_data->supply_regulator && init_data->supply_regulator_dev) {
+                dev_err(dev,
+                        "Supply regulator specified by both name and dev\n");
+                goto scrub;
+        }
+
+        if (init_data->supply_regulator) {
+                struct regulator_dev *r;
+                int found = 0;
+
+                list_for_each_entry(r, &regulator_list, list) {
+                        if (strcmp(rdev_get_name(r),
+                                   init_data->supply_regulator) == 0) {
+                                found = 1;
+                                break;
+                        }
+                }
+
+                if (!found) {
+                        dev_err(dev, "Failed to find supply %s\n",
+                                init_data->supply_regulator);
+                        goto scrub;
+                }
+
+                ret = set_supply(rdev, r);
+                if (ret < 0)
+                        goto scrub;
+        }
+
         if (init_data->supply_regulator_dev) {
+                dev_warn(dev, "Uses supply_regulator_dev instead of regulator_supply\n");
                 ret = set_supply(rdev,
                         dev_get_drvdata(init_data->supply_regulator_dev));
                 if (ret < 0)