src_mgr_dsb_src
int (*src_mgr_dsb_src)(void *blk, unsigned int idx);
.src_mgr_dsb_src = src_mgr_dsb_src,
.src_mgr_dsb_src = src_mgr_dsb_src,
hw->src_mgr_dsb_src(mgr->mgr.ctrl_blk,
hw->src_mgr_dsb_src(src_mgr->mgr.ctrl_blk, i);