sh_pfc_err_once
sh_pfc_err_once(bias, "SH_PFC_PIN_CFG_PULL_* flag set but .[gs]et_bias() not implemented\n");
sh_pfc_err_once(bias, "SH_PFC_PIN_CFG_PULL_UP flag set but no bias_regs defined and .pin_to_portcr() not implemented\n");
sh_pfc_err_once(drive, "SH_PFC_PIN_CFG_DRIVE_STRENGTH flag set but drive_regs missing\n");
sh_pfc_err_once(power, "SH_PFC_PIN_CFG_IO_VOLTAGE set but .pin_to_pocctrl() not implemented\n");