mux_f_gpio
val = (reg & BIT(bit_off)) ? mux_f_gpio : mux_f_mux;
case mux_f_gpio:
sppctl_first_master_set(&pctl->spp_gchip->chip, pin, mux_f_gpio, mux_m_iop);
if (g_f == mux_f_gpio && g_m == mux_m_gpio)
sppctl_first_master_set(&pctl->spp_gchip->chip, offset, mux_f_gpio, mux_m_gpio);