regulator: scmi: Allow for zero voltage domains

SCMI Voltage protocol allows the platform to report no voltage domains
on discovery, while warning the user about such an odd configuration.
As a consequence this condition should not be treated as error by the SCMI
regulator driver either.

Allow SCMI regulator driver to probe successfully even when no voltage
domains are discovered.

Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
Link: https://lore.kernel.org/r/20230126180511.766373-1-cristian.marussi@arm.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/scmi-regulator.c b/drivers/regulator/scmi-regulator.c
index b9918f4..29ab217 100644 (file)
--- a/drivers/regulator/scmi-regulator.c
+++ b/drivers/regulator/scmi-regulator.c
@@ -311,16 +311,12 @@ static int scmi_regulator_probe(struct scmi_device *sdev)
                return PTR_ERR(voltage_ops);
 
        num_doms = voltage_ops->num_domains_get(ph);
-       if (num_doms <= 0) {
-               if (!num_doms) {
-                       dev_err(&sdev->dev,
-                               "number of voltage domains invalid\n");
-                       num_doms = -EINVAL;
-               } else {
-                       dev_err(&sdev->dev,
-                               "failed to get voltage domains - err:%d\n",
-                               num_doms);
-               }
+       if (!num_doms)
+               return 0;
+
+       if (num_doms < 0) {
+               dev_err(&sdev->dev, "failed to get voltage domains - err:%d\n",
+                       num_doms);
 
                return num_doms;
        }