[PATCH v3 3/6] net: dsa: lantiq_gswip: ignore SerDes modes in phylink_mac_config()

[Daniel Golle <daniel@makrotopia.org>]

We can safely ignore SerDes interface modes 1000Base-X, 2500Base-X and
SGMII in phylink_mac_config() as they are being taken care of by the PCS
and the SGMII port anyway doesn't have MII_CFG and MII_PCDU registers
and hence gswip_phylink_mac_config() is already a no-op apart from
outputing a misleading error message.

Return early in case of SerDes interface modes to avoid printing that
error message.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Hauke Mehrtens <hauke@hauke-m.de>
---
v3: improve commit message
v2: no changes
 drivers/net/dsa/lantiq/lantiq_gswip.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/dsa/lantiq/lantiq_gswip.c b/drivers/net/dsa/lantiq/lantiq_gswip.c
index acb6996356e9..3e2a54569828 100644
--- a/drivers/net/dsa/lantiq/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq/lantiq_gswip.c
@@ -1444,6 +1444,10 @@ static void gswip_phylink_mac_config(struct phylink_config *config,
 	miicfg |= GSWIP_MII_CFG_LDCLKDIS;
 
 	switch (state->interface) {
+	case PHY_INTERFACE_MODE_SGMII:
+	case PHY_INTERFACE_MODE_1000BASEX:
+	case PHY_INTERFACE_MODE_2500BASEX:
+		return;
 	case PHY_INTERFACE_MODE_MII:
 	case PHY_INTERFACE_MODE_INTERNAL:
 		miicfg |= GSWIP_MII_CFG_MODE_MIIM;
-- 
2.51.0