regulator: Flag uncontrollable regulators as always_on

[ Upstream commit 261f06315cf7c3744731e36bfd8d4434949e3389 ]

While we currently assume that regulators with no control available are
just uncontionally enabled this isn't always as clearly displayed to
users as is desirable, for example the code for disabling unused
regulators will log that it is about to disable them. Clean this up a
bit by setting always_on during constraint evaluation if we have no
available mechanism for controlling the regualtor so things that check
the constraint will do the right thing.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220325144637.1543496-1-broonie@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Stable-dep-of: 80d2c29e09e6 ("regulator: core: Use ktime_get_boottime() to determine how long a regulator was off")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 3eae3aa5ad1d2a7ad29819aafc45d7f443f34a43..450aa0756dd8ce83ea9877b948072dbab1f8a07e 100644 (file)
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1521,6 +1521,24 @@ static int set_machine_constraints(struct regulator_dev *rdev)
                }
        }
 
+       /*
+        * If there is no mechanism for controlling the regulator then
+        * flag it as always_on so we don't end up duplicating checks
+        * for this so much.  Note that we could control the state of
+        * a supply to control the output on a regulator that has no
+        * direct control.
+        */
+       if (!rdev->ena_pin && !ops->enable) {
+               if (rdev->supply_name && !rdev->supply)
+                       return -EPROBE_DEFER;
+
+               if (rdev->supply)
+                       rdev->constraints->always_on =
+                               rdev->supply->rdev->constraints->always_on;
+               else
+                       rdev->constraints->always_on = true;
+       }
+
        /* If the constraints say the regulator should be on at this point
         * and we have control then make sure it is enabled.
         */