CMPB
t2_scr = GEM_BFINS(CMPB, GEM_IP4DST_CMP(index), t2_scr);
cmp_reg = CMPB;
pc->ctx.cmpb = ehrpwm_read(pc->mmio_base, CMPB);
ehrpwm_write(pc->mmio_base, CMPB, pc->ctx.cmpb);