Introduce two boolean flags into struct rk_priv_data indicating
whether RGMII and/or RMII is supported for this instance. Use these
to configure the supported_interfaces mask for phylink, validate the
interface mode. Initialise these from equivalent flags in the
rk_gmac_ops or depending on the presence of the ops->set_to_rgmii and
ops->set_to_mii methods. Finally, make ops->set_to_* optional.

This will allow us to get rid of empty set_to_rmii() methods.

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 .../net/ethernet/stmicro/stmmac/dwmac-rk.c    | 35 +++++++++++++------
 1 file changed, 25 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
index 4c80a73bbf74..fbc0e50519f6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
@@ -48,6 +48,8 @@ struct rk_gmac_ops {
 	u16 mac_speed_mask;
 
 	bool speed_reg_php_grf;
+	bool supports_rgmii;
+	bool supports_rmii;
 	bool php_grf_required;
 	bool regs_valid;
 	u32 regs[];
@@ -81,6 +83,8 @@ struct rk_priv_data {
 	bool clk_enabled;
 	bool clock_input;
 	bool integrated_phy;
+	bool supports_rgmii;
+	bool supports_rmii;
 
 	struct clk_bulk_data *clks;
 	int num_clks;
@@ -1387,6 +1391,9 @@ static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev,
 	bsp_priv->rmii_clk_sel_mask = ops->rmii_clk_sel_mask;
 	bsp_priv->mac_speed_mask = ops->mac_speed_mask;
 
+	bsp_priv->supports_rgmii = ops->supports_rgmii || !!ops->set_to_rgmii;
+	bsp_priv->supports_rmii = ops->supports_rmii || !!ops->set_to_rmii;
+
 	if (ops->init) {
 		ret = ops->init(bsp_priv);
 		if (ret) {
@@ -1405,11 +1412,11 @@ static int rk_gmac_check_ops(struct rk_priv_data *bsp_priv)
 	case PHY_INTERFACE_MODE_RGMII_ID:
 	case PHY_INTERFACE_MODE_RGMII_RXID:
 	case PHY_INTERFACE_MODE_RGMII_TXID:
-		if (!bsp_priv->ops->set_to_rgmii)
+		if (!bsp_priv->supports_rgmii)
 			return -EINVAL;
 		break;
 	case PHY_INTERFACE_MODE_RMII:
-		if (!bsp_priv->ops->set_to_rmii)
+		if (!bsp_priv->supports_rmii)
 			return -EINVAL;
 		break;
 	default:
@@ -1455,24 +1462,32 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
 	switch (bsp_priv->phy_iface) {
 	case PHY_INTERFACE_MODE_RGMII:
 		dev_info(dev, "init for RGMII\n");
-		bsp_priv->ops->set_to_rgmii(bsp_priv, bsp_priv->tx_delay,
-					    bsp_priv->rx_delay);
+		if (bsp_priv->ops->set_to_rgmii)
+			bsp_priv->ops->set_to_rgmii(bsp_priv,
+						    bsp_priv->tx_delay,
+						    bsp_priv->rx_delay);
 		break;
 	case PHY_INTERFACE_MODE_RGMII_ID:
 		dev_info(dev, "init for RGMII_ID\n");
-		bsp_priv->ops->set_to_rgmii(bsp_priv, 0, 0);
+		if (bsp_priv->ops->set_to_rgmii)
+			bsp_priv->ops->set_to_rgmii(bsp_priv, 0, 0);
 		break;
 	case PHY_INTERFACE_MODE_RGMII_RXID:
 		dev_info(dev, "init for RGMII_RXID\n");
-		bsp_priv->ops->set_to_rgmii(bsp_priv, bsp_priv->tx_delay, 0);
+		if (bsp_priv->ops->set_to_rgmii)
+			bsp_priv->ops->set_to_rgmii(bsp_priv,
+						    bsp_priv->tx_delay, 0);
 		break;
 	case PHY_INTERFACE_MODE_RGMII_TXID:
 		dev_info(dev, "init for RGMII_TXID\n");
-		bsp_priv->ops->set_to_rgmii(bsp_priv, 0, bsp_priv->rx_delay);
+		if (bsp_priv->ops->set_to_rgmii)
+			bsp_priv->ops->set_to_rgmii(bsp_priv,
+						    0, bsp_priv->rx_delay);
 		break;
 	case PHY_INTERFACE_MODE_RMII:
 		dev_info(dev, "init for RMII\n");
-		bsp_priv->ops->set_to_rmii(bsp_priv);
+		if (bsp_priv->ops->set_to_rmii)
+			bsp_priv->ops->set_to_rmii(bsp_priv);
 		break;
 	default:
 		dev_err(dev, "NO interface defined!\n");
@@ -1508,10 +1523,10 @@ static void rk_get_interfaces(struct stmmac_priv *priv, void *bsp_priv,
 {
 	struct rk_priv_data *rk = bsp_priv;
 
-	if (rk->ops->set_to_rgmii)
+	if (rk->supports_rgmii)
 		phy_interface_set_rgmii(interfaces);
 
-	if (rk->ops->set_to_rmii)
+	if (rk->supports_rmii)
 		__set_bit(PHY_INTERFACE_MODE_RMII, interfaces);
 }
 
-- 
2.47.3