IG4_REG_FS_SCL_LCNT
reg_write(sc, IG4_REG_FS_SCL_LCNT, sc->cfg.fs_scl_lcnt);
REGDUMP(sc, IG4_REG_FS_SCL_LCNT);
reg_read(sc, IG4_REG_FS_SCL_LCNT) & IG4_SCL_CLOCK_MASK;