static int aio_port_set_ch(struct uniphier_aio_sub *sub)
 {
        struct regmap *r = sub->aio->chip->regmap;
-       u32 slotsel_2ch[] = {
+       static const u32 slotsel_2ch[] = {
                0, 0, 0, 0, 0,
        };
-       u32 slotsel_multi[] = {
+       static const u32 slotsel_multi[] = {
                OPORTMXTYSLOTCTR_SLOTSEL_SLOT0,
                OPORTMXTYSLOTCTR_SLOTSEL_SLOT1,
                OPORTMXTYSLOTCTR_SLOTSEL_SLOT2,
                OPORTMXTYSLOTCTR_SLOTSEL_SLOT3,
                OPORTMXTYSLOTCTR_SLOTSEL_SLOT4,
        };
-       u32 mode, *slotsel;
+       u32 mode;
+       const u32 *slotsel;
        int i;
 
        switch (params_channels(&sub->params)) {
        struct uniphier_aio_chip *chip = sub->aio->chip;
        struct device *dev = &sub->aio->chip->pdev->dev;
        struct regmap *r = sub->aio->chip->regmap;
-       u32 v_pll[] = {
+       static const u32 v_pll[] = {
                OPORTMXCTR2_ACLKSEL_A1, OPORTMXCTR2_ACLKSEL_F1,
                OPORTMXCTR2_ACLKSEL_A2, OPORTMXCTR2_ACLKSEL_F2,
                OPORTMXCTR2_ACLKSEL_A2PLL,
                OPORTMXCTR2_ACLKSEL_RX1,
        };
-       u32 v_div[] = {
+       static const u32 v_div[] = {
                OPORTMXCTR2_DACCKSEL_1_2, OPORTMXCTR2_DACCKSEL_1_3,
                OPORTMXCTR2_DACCKSEL_1_1, OPORTMXCTR2_DACCKSEL_2_3,
        };