Call mac_select_pcs() function if provided in struct gswip_hwinfo.
The MaxLinear GSW1xx series got one port wired to a SerDes PCS and
PHY which can do 1000Base-X, 2500Base-X and SGMII. Support for the
SerDes port will be provided using phylink_pcs, so provide a
convenient way for mac_select_pcs() to differ based on the hardware
model.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: Hauke Mehrtens <hauke@hauke-m.de>
---
v3: no changes
v2: fix accidental change from 'static const struct' to 'const struct'
    reported by the kbuild bot

 drivers/net/dsa/lantiq/lantiq_gswip.c | 19 ++++++++++++++++---
 drivers/net/dsa/lantiq/lantiq_gswip.h |  3 +++
 2 files changed, 19 insertions(+), 3 deletions(-)

diff --git a/drivers/net/dsa/lantiq/lantiq_gswip.c b/drivers/net/dsa/lantiq/lantiq_gswip.c
index 67919c3935e4..acb6996356e9 100644
--- a/drivers/net/dsa/lantiq/lantiq_gswip.c
+++ b/drivers/net/dsa/lantiq/lantiq_gswip.c
@@ -1592,10 +1592,23 @@ static int gswip_get_sset_count(struct dsa_switch *ds, int port, int sset)
 	return ARRAY_SIZE(gswip_rmon_cnt);
 }
 
+static struct phylink_pcs *gswip_phylink_mac_select_pcs(struct phylink_config *config,
+							phy_interface_t interface)
+{
+	struct dsa_port *dp = dsa_phylink_to_port(config);
+	struct gswip_priv *priv = dp->ds->priv;
+
+	if (priv->hw_info->mac_select_pcs)
+		return priv->hw_info->mac_select_pcs(config, interface);
+
+	return NULL;
+}
+
 static const struct phylink_mac_ops gswip_phylink_mac_ops = {
-	.mac_config	= gswip_phylink_mac_config,
-	.mac_link_down	= gswip_phylink_mac_link_down,
-	.mac_link_up	= gswip_phylink_mac_link_up,
+	.mac_config		= gswip_phylink_mac_config,
+	.mac_link_down		= gswip_phylink_mac_link_down,
+	.mac_link_up		= gswip_phylink_mac_link_up,
+	.mac_select_pcs		= gswip_phylink_mac_select_pcs,
 };
 
 static const struct dsa_switch_ops gswip_switch_ops = {
diff --git a/drivers/net/dsa/lantiq/lantiq_gswip.h b/drivers/net/dsa/lantiq/lantiq_gswip.h
index 620c2d560cbe..19bbe6fddf04 100644
--- a/drivers/net/dsa/lantiq/lantiq_gswip.h
+++ b/drivers/net/dsa/lantiq/lantiq_gswip.h
@@ -4,6 +4,7 @@
 
 #include <linux/clk.h>
 #include <linux/mutex.h>
+#include <linux/phylink.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
@@ -237,6 +238,8 @@ struct gswip_hw_info {
 	enum dsa_tag_protocol tag_protocol;
 	void (*phylink_get_caps)(struct dsa_switch *ds, int port,
 				 struct phylink_config *config);
+	struct phylink_pcs *(*mac_select_pcs)(struct phylink_config *config,
+					      phy_interface_t interface);
 };
 
 struct gswip_gphy_fw {
-- 
2.51.0