setup_rgmii_delay() operation is only used once during the common phylink
MAC configuration. Only the lan937x switch implements this
setup_rgmii_delay().

Remove the setup_rgmii_delay operation from ksz_dev_ops.
Implement a lan937x-specific phylink MAC configuration that does this
RGMII delay setup.
Export ksz_set_xmii since it's needed by the lan937x implementation.

Signed-off-by: Bastien Curutchet (Schneider Electric) <redacted>
---
 drivers/net/dsa/microchip/ksz_common.c   |  6 +-----
 drivers/net/dsa/microchip/ksz_common.h   |  2 +-
 drivers/net/dsa/microchip/lan937x_main.c | 29 +++++++++++++++++++++++++++--
 3 files changed, 29 insertions(+), 8 deletions(-)

diff --git a/drivers/net/dsa/microchip/ksz_common.c b/drivers/net/dsa/microchip/ksz_common.c
index 5fb151fbf4f3..d6511fcebcf2 100644
--- a/drivers/net/dsa/microchip/ksz_common.c
+++ b/drivers/net/dsa/microchip/ksz_common.c

@@ -3127,8 +3127,7 @@ int ksz_set_mac_eee(struct dsa_switch *ds, int port,
 	return 0;
 }
 
-static void ksz_set_xmii(struct ksz_device *dev, int port,
-			 phy_interface_t interface)
+void ksz_set_xmii(struct ksz_device *dev, int port, phy_interface_t interface)
 {
 	const u8 *bitval = dev->info->xmii_ctrl1;
 	struct ksz_port *p = &dev->ports[port];

@@ -3233,9 +3232,6 @@ void ksz_phylink_mac_config(struct phylink_config *config,
 	}
 
 	ksz_set_xmii(dev, port, state->interface);
-
-	if (dev->dev_ops->setup_rgmii_delay)
-		dev->dev_ops->setup_rgmii_delay(dev, port);
 }
 
 bool ksz_get_gbit(struct ksz_device *dev, int port)

diff --git a/drivers/net/dsa/microchip/ksz_common.h b/drivers/net/dsa/microchip/ksz_common.h
index 804912fdd2db..ab08c98ed257 100644
--- a/drivers/net/dsa/microchip/ksz_common.h
+++ b/drivers/net/dsa/microchip/ksz_common.h

@@ -410,7 +410,6 @@ struct ksz_dev_ops {
 			   u8 data);
 	void (*freeze_mib)(struct ksz_device *dev, int port, bool freeze);
 	void (*port_init_cnt)(struct ksz_device *dev, int port);
-	void (*setup_rgmii_delay)(struct ksz_device *dev, int port);
 	int (*tc_cbs_set_cinc)(struct ksz_device *dev, int port, u32 val);
 	int (*init)(struct ksz_device *dev);
 };

@@ -468,6 +467,7 @@ void ksz_phylink_get_caps(struct dsa_switch *ds, int port,
 void ksz_phylink_mac_disable_tx_lpi(struct phylink_config *config);
 int ksz_phylink_mac_enable_tx_lpi(struct phylink_config *config,
 				  u32 timer, bool tx_clock_stop);
+void ksz_set_xmii(struct ksz_device *dev, int port, phy_interface_t interface);
 void ksz_phylink_mac_config(struct phylink_config *config,
 			    unsigned int mode,
 			    const struct phylink_link_state *state);

diff --git a/drivers/net/dsa/microchip/lan937x_main.c b/drivers/net/dsa/microchip/lan937x_main.c
index 57e289637193..f8f220242f7a 100644
--- a/drivers/net/dsa/microchip/lan937x_main.c
+++ b/drivers/net/dsa/microchip/lan937x_main.c

@@ -643,6 +643,32 @@ static void lan937x_setup_rgmii_delay(struct ksz_device *dev, int port)
 	}
 }
 
+static void lan937x_phylink_mac_config(struct phylink_config *config,
+				       unsigned int mode,
+				       const struct phylink_link_state *state)
+{
+	struct dsa_port *dp = dsa_phylink_to_port(config);
+	struct ksz_device *dev = dp->ds->priv;
+	int port = dp->index;
+
+	/* Internal PHYs */
+	if (dev->info->internal_phy[port])
+		return;
+
+	/* No need to configure XMII control register when using SGMII. */
+	if (ksz_is_sgmii_port(dev, port))
+		return;
+
+	if (phylink_autoneg_inband(mode)) {
+		dev_err(dev->dev, "In-band AN not supported!\n");
+		return;
+	}
+
+	ksz_set_xmii(dev, port, state->interface);
+
+	lan937x_setup_rgmii_delay(dev, port);