net: stmmac: dwmac-rzn1: provide select_pcs() implementation

Provide a .select_pcs() implementation which returns the phylink PCS
that was created in the .pcs_init() method.
Tested-by: Romain Gantois <romain.gantois@bootlin.com>
Reviewed-by: Romain Gantois <romain.gantois@bootlin.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Link: https://lore.kernel.org/r/E1sHhoW-00FetH-GD@rmk-PC.armlinux.org.ukSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/dwmac-rzn1.c

@@ -39,6 +39,12 @@ static void rzn1_dwmac_pcs_exit(struct stmmac_priv *priv)
 		miic_destroy(priv->hw->phylink_pcs);
 }
 
+static struct phylink_pcs *rzn1_dwmac_select_pcs(struct stmmac_priv *priv,
+						 phy_interface_t interface)
+{
+	return priv->hw->phylink_pcs;
+}
+
 static int rzn1_dwmac_probe(struct platform_device *pdev)
 {
 	struct plat_stmmacenet_data *plat_dat;
@@ -57,6 +63,7 @@ static int rzn1_dwmac_probe(struct platform_device *pdev)
 	plat_dat->bsp_priv = plat_dat;
 	plat_dat->pcs_init = rzn1_dwmac_pcs_init;
 	plat_dat->pcs_exit = rzn1_dwmac_pcs_exit;
+	plat_dat->select_pcs = rzn1_dwmac_select_pcs;
 
 	ret = stmmac_dvr_probe(dev, plat_dat, &stmmac_res);
 	if (ret)