RTCA3_RSR
val = readb(priv->base + RTCA3_RSR);
writeb(val & ~pending, priv->base + RTCA3_RSR);
val = readb(priv->base + RTCA3_RSR);
writeb(val & ~pending, priv->base + RTCA3_RSR);
rtca3_byte_update_bits(priv, RTCA3_RSR, RTCA3_RSR_CF, 0);
tmp = readb(priv->base + RTCA3_RSR);
rtca3_byte_update_bits(priv, RTCA3_RSR, interrupts, 0);