amd_pmio_read
addr = amd_pmio_read(res, AMDSB8_PM_SMBUS_EN + 1);
addr |= amd_pmio_read(res, AMDSB8_PM_SMBUS_EN);
addr = amd_pmio_read(res, AMDFCH41_PM_DECODE_EN0);
addr = amd_pmio_read(res, AMDFCH41_PM_DECODE_EN1);