com_write_1
.com_write_1 = sc16is7xx_i2c_com_write_1,
regs->cr_write = com_write_1;
sc->sc_com.sc_regs.cr_write = psc->sc_com_funcs->com_write_1;
void (*com_write_1)(struct com_regs *, u_int, uint8_t);
.com_write_1 = sc16is7xx_spi_com_write_1,