tegra_bpmp_mb_read_field
*ret = tegra_bpmp_mb_read_field(&channel->ib, code);
unsigned long flags = tegra_bpmp_mb_read_field(&channel->ib, flags);
unsigned long flags = tegra_bpmp_mb_read_field(&channel->ob, flags);
unsigned int mrq = tegra_bpmp_mb_read_field(&channel->ib, code);