net: stmmac: socfpga: re-use the `interface` parameter from platform data

The socfpga sub-driver defines an `interface` field in the `socfpga_dwmac`
struct and parses it on init.

The shared `stmmac_probe_config_dt()` function also parses this from the
device-tree and makes it available on the returned `plat_data` (which is
the same data available via `netdev_priv()`).

All that's needed now is to dig that information out, via some
`dev_get_drvdata()` && `netdev_priv()` calls and re-use it.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -46,7 +46,6 @@ struct socfpga_dwmac_ops {
 };
 
 struct socfpga_dwmac {
-	int	interface;
 	u32	reg_offset;
 	u32	reg_shift;
 	struct	device *dev;
@@ -110,8 +109,6 @@ static int socfpga_dwmac_parse_data(struct socfpga_dwmac *dwmac, struct device *
 	struct resource res_tse_pcs;
 	struct resource res_sgmii_adapter;
 
-	dwmac->interface = of_get_phy_mode(np);
-
 	sys_mgr_base_addr =
 		altr_sysmgr_regmap_lookup_by_phandle(np, "altr,sysmgr-syscon");
 	if (IS_ERR(sys_mgr_base_addr)) {
@@ -231,6 +228,14 @@ err_node_put:
 	return ret;
 }
 
+static int socfpga_get_plat_phymode(struct socfpga_dwmac *dwmac)
+{
+	struct net_device *ndev = dev_get_drvdata(dwmac->dev);
+	struct stmmac_priv *priv = netdev_priv(ndev);
+
+	return priv->plat->interface;
+}
+
 static int socfpga_set_phy_mode_common(int phymode, u32 *val)
 {
 	switch (phymode) {
@@ -255,7 +260,7 @@ static int socfpga_set_phy_mode_common(int phymode, u32 *val)
 static int socfpga_gen5_set_phy_mode(struct socfpga_dwmac *dwmac)
 {
 	struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
-	int phymode = dwmac->interface;
+	int phymode = socfpga_get_plat_phymode(dwmac);
 	u32 reg_offset = dwmac->reg_offset;
 	u32 reg_shift = dwmac->reg_shift;
 	u32 ctrl, val, module;
@@ -314,7 +319,7 @@ static int socfpga_gen5_set_phy_mode(struct socfpga_dwmac *dwmac)
 static int socfpga_gen10_set_phy_mode(struct socfpga_dwmac *dwmac)
 {
 	struct regmap *sys_mgr_base_addr = dwmac->sys_mgr_base_addr;
-	int phymode = dwmac->interface;
+	int phymode = socfpga_get_plat_phymode(dwmac);
 	u32 reg_offset = dwmac->reg_offset;
 	u32 reg_shift = dwmac->reg_shift;
 	u32 ctrl, val, module;