AMBA_REV_BITS
rev = AMBA_REV_BITS(pid);
AMBA_REV_BITS(pid), AMBA_CONFIG_BITS(pid));
if (AMBA_REV_BITS(host->pid) >= 8) {
if (AMBA_REV_BITS(host->pid) >= 8) {
#define amba_rev(d) AMBA_REV_BITS((d)->periphid)