R_D0_B_HORIZ_PRESCALING
R_D0_B_HORIZ_PRESCALING, 0x01,
if (!saa711x_has_reg(state->ident, R_D0_B_HORIZ_PRESCALING)) {
saa711x_write(sd, R_D0_B_HORIZ_PRESCALING,
{R_D0_B_HORIZ_PRESCALING,1,