to_sprd_mbox_priv
struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);
struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);
struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);
struct sprd_mbox_priv *priv = to_sprd_mbox_priv(chan->mbox);