[PATCH v1 2/2] regulator: core: Allow generic coupling only for always-on regulators

[Dmitry Osipenko <digetx@gmail.com>]

The generic voltage balancer doesn't work correctly if one of regulator
couples turns off. Currently there are no users in kernel for that case,
although let's explicitly show that this case is unsupported for those who
will try to use that feature.

Link: https://lore.kernel.org/linux-samsung-soc/20191008170503.yd6GscYPLxjgrXqDuCO7AJc6i6egNZGJkVWHLlCxvA4@z/
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/regulator/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 51ce280c1ce1..970905124382 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -4963,6 +4963,12 @@ static int generic_coupler_attach(struct regulator_coupler *coupler,
 		return -EPERM;
 	}
 
+	if (!rdev->constraints->always_on) {
+		rdev_err(rdev,
+			 "Coupling of a non always-on regulator is unimplemented\n");
+		return -ENOTSUPP;
+	}
+
 	return 0;
 }
 
-- 
2.23.0