#define VT1724_REVO_CCLK 0x02
#define VT1724_REVO_CDIN 0x04 /* not used */
#define VT1724_REVO_CDOUT 0x08
-#define VT1724_REVO_CS0 0x10 /* not used */
+#define VT1724_REVO_CS0 0x10 /* AK5365 chipselect for Rev. 5.1 */
#define VT1724_REVO_CS1 0x20 /* front AKM4381 chipselect */
#define VT1724_REVO_CS2 0x40 /* surround AKM4355 chipselect */
#define VT1724_REVO_MUTE (1<<22) /* 0 = all mute, 1 = normal operation */