diff --git a/driver/usb_mux_ps874x.c b/driver/usb_mux_ps874x.c
index 76b7eb26c3..900ae0763a 100644
--- a/driver/usb_mux_ps874x.c
+++ b/driver/usb_mux_ps874x.c
@@ -33,20 +33,27 @@ static int ps874x_init(int i2c_addr)
 
 	/*
 	 * Verify revision / chip ID registers.
-	 * From Parade: PS8743 may have REVISION_ID1 as 0 or 1,
-	 * PS8740 may have REVISION_ID2 as 0 or 1,
-	 * 1 is derived from 0 and have same functionality.
 	 */
 	res = ps874x_read(i2c_addr, PS874X_REG_REVISION_ID1, &val);
 	if (res)
 		return res;
-	if (val < PS874X_REVISION_ID1)
+
+#ifdef CONFIG_USB_MUX_PS8743
+	/*
+	 * From Parade: PS8743 may have REVISION_ID1 as 0 or 1
+	 * Rev 1 is derived from Rev 0 and have same functionality.
+	 */
+	if (val != PS874X_REVISION_ID1_0 && val != PS874X_REVISION_ID1_1)
 		return EC_ERROR_UNKNOWN;
+#else
+	if (val != PS874X_REVISION_ID1)
+		return EC_ERROR_UNKNOWN;
+#endif
 
 	res = ps874x_read(i2c_addr, PS874X_REG_REVISION_ID2, &val);
 	if (res)
 		return res;
-	if (val < PS874X_REVISION_ID2)
+	if (val != PS874X_REVISION_ID2)
 		return EC_ERROR_UNKNOWN;
 
 	res = ps874x_read(i2c_addr, PS874X_REG_CHIP_ID1, &val);
diff --git a/driver/usb_mux_ps874x.h b/driver/usb_mux_ps874x.h
index 8092e448bb..e9d4c1ff36 100644
--- a/driver/usb_mux_ps874x.h
+++ b/driver/usb_mux_ps874x.h
@@ -40,11 +40,12 @@
 #define PS874X_REG_CHIP_ID1     0xf2
 #define PS874X_REG_CHIP_ID2     0xf3
 #ifdef CONFIG_USB_MUX_PS8740
-	#define PS874X_REVISION_ID1 0x00
-	#define PS874X_REVISION_ID2 0x0a
-	#define PS874X_CHIP_ID1     0x40
+	#define PS874X_REVISION_ID1   0x00
+	#define PS874X_REVISION_ID2   0x0a
+	#define PS874X_CHIP_ID1       0x40
 #elif defined(CONFIG_USB_MUX_PS8743)
-	#define PS874X_REVISION_ID1 0x01
+	#define PS874X_REVISION_ID1_0 0x00
+	#define PS874X_REVISION_ID1_1 0x01
 	#define PS874X_REVISION_ID2 0x0b
 	#define PS874X_CHIP_ID1     0x41
 #endif