[PATCH net-next v3 2/6] net: stmmac: add support to use a generic phylink_pcs as PCS

[Clément Léger <clement.leger@xxxxxxxxxxx>]

Currently, the PCS is set based on the presence of the xpcs field. In
order to allow supporting other PCS, add a phylink_pcs pcs field to struct
mac_device_info which is used in stmmac_mac_select_pcs() to select the
correct PCS.

Signed-off-by: Clément Léger <clement.leger@xxxxxxxxxxx>
---
 drivers/net/ethernet/stmicro/stmmac/common.h      | 2 ++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 5 +----
 drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c | 1 +
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index 6b5d96bced47..79fd67e8ab90 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -15,6 +15,7 @@
 #include <linux/netdevice.h>
 #include <linux/stmmac.h>
 #include <linux/phy.h>
+#include <linux/phylink.h>
 #include <linux/pcs/pcs-xpcs.h>
 #include <linux/module.h>
 #if IS_ENABLED(CONFIG_VLAN_8021Q)
@@ -518,6 +519,7 @@ struct mac_device_info {
 	const struct stmmac_tc_ops *tc;
 	const struct stmmac_mmc_ops *mmc;
 	struct dw_xpcs *xpcs;
+	struct phylink_pcs *phylink_pcs;
 	struct mii_regs mii;	/* MII register Addresses */
 	struct mac_link link;
 	void __iomem *pcsr;     /* vpointer to device CSRs */
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index f44e4e4b4f16..9a8721227b17 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -937,10 +937,7 @@ static struct phylink_pcs *stmmac_mac_select_pcs(struct phylink_config *config,
 {
 	struct stmmac_priv *priv = netdev_priv(to_net_dev(config->dev));
 
-	if (!priv->hw->xpcs)
-		return NULL;
-
-	return &priv->hw->xpcs->pcs;
+	return priv->hw->phylink_pcs;
 }
 
 static void stmmac_mac_config(struct phylink_config *config, unsigned int mode,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
index 21aaa2730ac8..68deda5c5fa9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
@@ -513,6 +513,7 @@ int stmmac_xpcs_setup(struct mii_bus *bus)
 		}
 
 		priv->hw->xpcs = xpcs;
+		priv->hw->phylink_pcs = &xpcs->pcs;
 		break;
 	}
 
-- 
2.39.0