regulator: pca9450: Enable DVS control via PMIC_STBY_REQ

When DVS is enabled via the devicetree properties
"nxp,dvs-run-voltage" and "nxp,dvs-standby-voltage" then
also the bit that enables DVS control via PMIC_STBY_REQ pin
should be set.

Signed-off-by: Rickard x Andersson <rickaran@axis.com>
Link: https://lore.kernel.org/r/20220429072211.24957-5-rickaran@axis.com
Signed-off-by: Mark Brown <broonie@kernel.org>

Author: Rickard x Andersson

drivers/regulator/pca9450-regulator.c

@@ -174,6 +174,14 @@ static int buck_set_dvs(const struct regulator_desc *desc,
 		}
 	}
 
+	if (ret == 0) {
+		struct pca9450_regulator_desc *regulator = container_of(desc,
+					struct pca9450_regulator_desc, desc);
+
+		/* Enable DVS control through PMIC_STBY_REQ for this BUCK */
+		ret = regmap_update_bits(regmap, regulator->desc.enable_reg,
+					 BUCK1_DVS_CTRL, BUCK1_DVS_CTRL);
+	}
 	return ret;
 }