net: dsa: microchip: KSZ9893: do not write to not supported Output Clock Control...

This issue was detected after adding regmap register access validation.
KSZ9893 compatible chips do not have "Output Clock Control Register
0x0103". So, avoid writing to it.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index f60ceaf..fb9de6b 100644 (file)
--- a/drivers/net/dsa/microchip/ksz9477.c
+++ b/drivers/net/dsa/microchip/ksz9477.c
@@ -193,6 +193,11 @@ int ksz9477_reset_switch(struct ksz_device *dev)
        ksz_write32(dev, REG_SW_PORT_INT_MASK__4, 0x7F);
        ksz_read32(dev, REG_SW_PORT_INT_STATUS__4, &data32);
 
+       /* KSZ9893 compatible chips do not support refclk configuration */
+       if (dev->chip_id == KSZ9893_CHIP_ID ||
+           dev->chip_id == KSZ8563_CHIP_ID)
+               return 0;
+
        data8 = SW_ENABLE_REFCLKO;
        if (dev->synclko_disable)
                data8 = 0;