diff --git a/drivers/mmc/core/regulator.c b/drivers/mmc/core/regulator.c
index 96b1d15045d6..609201a467ef 100644
--- a/drivers/mmc/core/regulator.c
+++ b/drivers/mmc/core/regulator.c
@@ -159,6 +159,8 @@ static int mmc_regulator_set_voltage_if_supported(struct regulator *regulator,
 
 /**
  * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
+ * @mmc: the host to regulate
+ * @ios: io bus settings
  *
  * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
  * That will match the behavior of old boards where VQMMC and VMMC were supplied