+static int ad5064_request_vref(struct ad5064_state *st, struct device *dev)
+{
+ unsigned int i;
+ int ret;
+
+ for (i = 0; i < ad5064_num_vref(st); ++i)
+ st->vref_reg[i].supply = ad5064_vref_name(st, i);
+
+ if (!st->chip_info->internal_vref)
+ return devm_regulator_bulk_get(dev, ad5064_num_vref(st),
+ st->vref_reg);
+
+ /*
+ * This assumes that when the regulator has an internal VREF
+ * there is only one external VREF connection, which is
+ * currently the case for all supported devices.
+ */
+ st->vref_reg[0].consumer = devm_regulator_get_optional(dev, "vref");
+ if (!IS_ERR(st->vref_reg[0].consumer))
+ return 0;
+
+ ret = PTR_ERR(st->vref_reg[0].consumer);
+ if (ret != -ENODEV)
+ return ret;
+
+ /* If no external regulator was supplied use the internal VREF */
+ st->use_internal_vref = true;
+ ret = ad5064_set_config(st, AD5064_CONFIG_INT_VREF_ENABLE);
+ if (ret)
+ dev_err(dev, "Failed to enable internal vref: %d\n", ret);
+
+ return ret;
+}
+