--- a/drivers/staging/mt7621-pci-phy/Kconfig
+++ b/drivers/staging/mt7621-pci-phy/Kconfig
@@ -3,6 +3,7 @@ config PCI_MT7621_PHY
 	tristate "MediaTek MT7621 PCI PHY Driver"
 	depends on RALINK && OF
 	select GENERIC_PHY
+	select REGMAP_MMIO
 	help
 	  Say 'Y' here to add support for MediaTek MT7621 PCI PHY driver,