MBOX_CHAN_MAX
if (ch >= MBOX_CHAN_MAX) {
mbox->controller.num_chans = MBOX_CHAN_MAX;
for (ch = 0; ch < MBOX_CHAN_MAX; ch++)
struct mbox_chan chan[MBOX_CHAN_MAX];
struct hi3660_chan_info mchan[MBOX_CHAN_MAX];
mbox->chan_num = MBOX_CHAN_MAX;
void *irq_map_chan[MBOX_CHAN_MAX];