net: zynq_gem: Dont enable SGMII and PCS selection

Dont enable SGMII and PCS selection if internal PCS/PMA
is not used, by getting the info about internal/external
PCS/PMA usage from dt property "is-internal-phy".

Signed-off-by: Siva Durga Prasad Paladugu <sivadur@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

drivers/net/zynq_gem.c

@@ -182,6 +182,7 @@ struct zynq_gem_priv {
 	int phy_of_handle;
 	struct mii_dev *bus;
 	struct clk clk;
+	bool int_pcs;
 };
 
 static u32 phy_setup_op(struct zynq_gem_priv *priv, u32 phy_addr, u32 regnum,
@@ -425,7 +426,12 @@ static int zynq_gem_init(struct udevice *dev)
 
 	nwconfig = ZYNQ_GEM_NWCFG_INIT;
 
-	if (priv->interface == PHY_INTERFACE_MODE_SGMII) {
+	/*
+	 * Set SGMII enable PCS selection only if internal PCS/PMA
+	 * core is used and interface is SGMII.
+	 */
+	if (priv->interface == PHY_INTERFACE_MODE_SGMII &&
+	    priv->int_pcs) {
 		nwconfig |= ZYNQ_GEM_NWCFG_SGMII_ENBL |
 			    ZYNQ_GEM_NWCFG_PCS_SEL;
 #ifdef CONFIG_ARM64
@@ -697,6 +703,9 @@ static int zynq_gem_ofdata_to_platdata(struct udevice *dev)
 	}
 	priv->interface = pdata->phy_interface;
 
+	priv->int_pcs = fdtdec_get_bool(gd->fdt_blob, node,
+					"is-internal-pcspma");
+
 	printf("ZYNQ GEM: %lx, phyaddr %x, interface %s\n", (ulong)priv->iobase,
 	       priv->phyaddr, phy_string_for_interface(priv->interface));