net: stmmac: modified pcs mode support for RGMII

snps databook noted that physical coding sublayer (PCS) interface
that can be used when the MAC is configured for the TBI, RTBI, or
SGMII PHY interface. we have RGMII and SGMII in a SoC and it also
has the PCS block. it needs stmmac_init_phy and stmmac_mdio_register
function for initializing phy when it used RGMII interface.

Signed-off-by: Dejin Zheng <zhengdejin5@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -388,9 +388,8 @@ bool stmmac_eee_init(struct stmmac_priv *priv)
 	/* Using PCS we cannot dial with the phy registers at this stage
 	 * so we do not support extra feature like EEE.
 	 */
-	if ((priv->hw->pcs == STMMAC_PCS_RGMII) ||
-	    (priv->hw->pcs == STMMAC_PCS_TBI) ||
-	    (priv->hw->pcs == STMMAC_PCS_RTBI))
+	if (priv->hw->pcs == STMMAC_PCS_TBI ||
+	    priv->hw->pcs == STMMAC_PCS_RTBI)
 		return false;
 
 	/* Check if MAC core supports the EEE feature. */
@@ -2687,8 +2686,7 @@ static int stmmac_open(struct net_device *dev)
 	u32 chan;
 	int ret;
 
-	if (priv->hw->pcs != STMMAC_PCS_RGMII &&
-	    priv->hw->pcs != STMMAC_PCS_TBI &&
+	if (priv->hw->pcs != STMMAC_PCS_TBI &&
 	    priv->hw->pcs != STMMAC_PCS_RTBI) {
 		ret = stmmac_init_phy(dev);
 		if (ret) {
@@ -4876,8 +4874,7 @@ int stmmac_dvr_probe(struct device *device,
 
 	stmmac_check_pcs_mode(priv);
 
-	if (priv->hw->pcs != STMMAC_PCS_RGMII  &&
-	    priv->hw->pcs != STMMAC_PCS_TBI &&
+	if (priv->hw->pcs != STMMAC_PCS_TBI &&
 	    priv->hw->pcs != STMMAC_PCS_RTBI) {
 		/* MDIO bus Registration */
 		ret = stmmac_mdio_register(ndev);
@@ -4911,8 +4908,7 @@ int stmmac_dvr_probe(struct device *device,
 error_netdev_register:
 	phylink_destroy(priv->phylink);
 error_phy_setup:
-	if (priv->hw->pcs != STMMAC_PCS_RGMII &&
-	    priv->hw->pcs != STMMAC_PCS_TBI &&
+	if (priv->hw->pcs != STMMAC_PCS_TBI &&
 	    priv->hw->pcs != STMMAC_PCS_RTBI)
 		stmmac_mdio_unregister(ndev);
 error_mdio_register:
@@ -4957,8 +4953,7 @@ int stmmac_dvr_remove(struct device *dev)
 		reset_control_assert(priv->plat->stmmac_rst);
 	clk_disable_unprepare(priv->plat->pclk);
 	clk_disable_unprepare(priv->plat->stmmac_clk);
-	if (priv->hw->pcs != STMMAC_PCS_RGMII &&
-	    priv->hw->pcs != STMMAC_PCS_TBI &&
+	if (priv->hw->pcs != STMMAC_PCS_TBI &&
 	    priv->hw->pcs != STMMAC_PCS_RTBI)
 		stmmac_mdio_unregister(ndev);
 	destroy_workqueue(priv->wq);