VAL_CMAP_OFFSET
*(sc->sc_base + VAL_CMAP_OFFSET + VAL_CMAP_ADDR) = reg;
*(sc->sc_base + VAL_CMAP_OFFSET + VAL_CMAP_LUT) = r;
*(sc->sc_base + VAL_CMAP_OFFSET + VAL_CMAP_LUT) = g;
*(sc->sc_base + VAL_CMAP_OFFSET + VAL_CMAP_LUT) = b;