[PATCH net-next v4 08/17] net: dsa: microchip: KSZ9893: do not write to not supported Output Clock Control Register

[Oleksij Rempel]

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@xxxxxxxxxxxxxx>
Reviewed-by: Vladimir Oltean <olteanv@xxxxxxxxx>
---
 drivers/net/dsa/microchip/ksz9477.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c
index f60ceaf25a66c..fb9de6b447b12 100644
--- 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;
-- 
2.30.2