diff --git a/src/device/Kconfig b/src/device/Kconfig
index f7adb07917..0bd9fe1d8b 100644
--- a/src/device/Kconfig
+++ b/src/device/Kconfig
@@ -480,10 +480,6 @@ config LINEAR_FRAMEBUFFER_MAX_HEIGHT
 
 endmenu # "Display"
 
-config SMBUS_HAS_AUX_CHANNELS
-	bool
-	default n
-
 config PCI
 	bool
 	default n
diff --git a/src/include/device/smbus.h b/src/include/device/smbus.h
index 863bc80d2a..094ad42629 100644
--- a/src/include/device/smbus.h
+++ b/src/include/device/smbus.h
@@ -53,9 +53,4 @@ static inline int smbus_write_byte(struct device *const dev, u8 addr, u8 val)
 int smbus_block_read(struct device *dev, u8 cmd, u8 bytes, u8 *buffer);
 int smbus_block_write(struct device *dev, u8 cmd, u8 bytes, const u8 *buffer);
 
-#if CONFIG(SMBUS_HAS_AUX_CHANNELS)
-void smbus_switch_to_channel(uint8_t channel_number);
-uint8_t smbus_get_current_channel(void);
-#endif
-
 #endif /* DEVICE_SMBUS_H */