PWRMGMT1_SET_VMIDSEL
{ PWRMGMT1_REG, PWRMGMT1_SET_VMIDSEL(1) | PWRMGMT1_VREF },
wm8750_write(sc, PWRMGMT1_REG, PWRMGMT1_SET_VMIDSEL(2));
wm8750_write(sc, PWRMGMT1_REG, PWRMGMT1_SET_VMIDSEL(2));
val = PWRMGMT1_SET_VMIDSEL(1) | PWRMGMT1_VREF;