regulator: anatop: Fail on invalid voltage selector

A '0' voltage selector is invalid and can't be used with this driver.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/regulator/anatop-regulator.c b/drivers/regulator/anatop-regulator.c
index 30e8d7ad5813..542d14ed48bb 100644
--- a/drivers/regulator/anatop-regulator.c
+++ b/drivers/regulator/anatop-regulator.c
@@ -291,6 +291,11 @@ static int anatop_regulator_probe(struct platform_device *pdev)
                  */
                 if (!sreg->sel && !strcmp(sreg->name, "vddpu"))
                         sreg->sel = 22;
+
+                if (!sreg->sel) {
+                        dev_err(&pdev->dev, "Failed to read a valid default voltage selector.\n");
+                        return -EINVAL;
+                }
         } else {
                 rdesc->ops = &anatop_rops;
         }