RZG2L_GTCR_TPCS
prescale = FIELD_GET(RZG2L_GTCR_TPCS, val);
rzg2l_gpt_modify(rzg2l_gpt, RZG2L_GTCR(ch), RZG2L_GTCR_TPCS,
FIELD_PREP(RZG2L_GTCR_TPCS, prescale));