PMC_PLLBCK
at91rm9200_pmc = pmc_data_allocate(PMC_PLLBCK + 1,
at91rm9200_pmc->chws[PMC_PLLBCK] = hw;
at91sam9260_pmc = pmc_data_allocate(PMC_PLLBCK + 1,
at91sam9260_pmc->chws[PMC_PLLBCK] = hw;
at91sam9n12_pmc = pmc_data_allocate(PMC_PLLBCK + 1,
at91sam9n12_pmc->chws[PMC_PLLBCK] = hw;