#define I2S_PWM_SCALE_CK        2
#define I2S_PWM_SCALE_CK_MASK   0x0003

/* asm */
#define I2S_ABUF_OFF_IDXR       0
#define I2S_ABUF_OFF_IDXW       2
#define I2S_ABUF_OFF_SIZE       4
#define I2S_ABUF_OFF_ARRAY      8