rcar_drif_hwbuf
struct rcar_drif_hwbuf buf[RCAR_DRIF_NUM_HWBUFS]; /* H/W bufs */
static inline bool rcar_drif_bufs_done(struct rcar_drif_hwbuf **buf)
static inline bool rcar_drif_bufs_overflow(struct rcar_drif_hwbuf **buf)
static inline void rcar_drif_bufs_clear(struct rcar_drif_hwbuf **buf,
struct rcar_drif_hwbuf *buf[RCAR_DRIF_MAX_CHANNEL];