powerpc/sgmii: To support PHY link state auto detect in SGMII mode

PHYs on SGMII riser card are used in SGMII mode with different external
IRQs from eTSEC. This means in SGMII mode phy-handle and phy-connection-type
under ethernet node should be updated. Otherwise the PHY interrupt can not
be handled therefor PHY link state change can not be auto detected.

For we have seperate SGMII PHY nodes, ethernet PHY reg fixup is not needed
but it's still be kept to guarantee the sgmii mode could work with old
device tree.

Signed-off-by: Li Yang <leoli@freescale.com>
Signed-off-by: Jia Hongtao <B38951@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>

board/freescale/common/sgmii_riser.c

@@ -17,6 +17,7 @@
 #include <net.h>
 #include <libfdt.h>
 #include <tsec.h>
+#include <fdt_support.h>
 
 void fsl_sgmii_riser_init(struct tsec_info_struct *tsec_info, int num)
 {
@@ -31,6 +32,7 @@ void fsl_sgmii_riser_fdt_fixup(void *fdt)
 {
 	struct eth_device *dev;
 	int node;
+	int mdio_node;
 	int i = -1;
 	int etsec_num = 0;
 
@@ -40,16 +42,38 @@ void fsl_sgmii_riser_fdt_fixup(void *fdt)
 
 	while ((dev = eth_get_dev_by_index(++i)) != NULL) {
 		struct tsec_private *priv;
+		int phy_node;
 		int enet_node;
+		uint32_t ph;
+		char sgmii_phy[16];
 		char enet[16];
 		const u32 *phyh;
-		int phynode;
 		const char *model;
 		const char *path;
 
 		if (!strstr(dev->name, "eTSEC"))
 			continue;
 
+		priv = dev->priv;
+		if (!(priv->flags & TSEC_SGMII)) {
+			etsec_num++;
+			continue;
+		}
+
+		mdio_node = fdt_node_offset_by_compatible(fdt, -1,
+				"fsl,gianfar-mdio");
+		if (mdio_node < 0)
+			return;
+
+		sprintf(sgmii_phy, "sgmii-phy@%d", etsec_num);
+		phy_node = fdt_subnode_offset(fdt, mdio_node, sgmii_phy);
+		if (phy_node > 0) {
+			fdt_increase_size(fdt, 32);
+			ph = fdt_create_phandle(fdt, phy_node);
+			if (!ph)
+				continue;
+		}
+
 		sprintf(enet, "ethernet%d", etsec_num++);
 		path = fdt_getprop(fdt, node, enet, NULL);
 		if (!path) {
@@ -74,15 +98,32 @@ void fsl_sgmii_riser_fdt_fixup(void *fdt)
 		if (!strstr(model, "TSEC"))
 			continue;
 
-		phyh = fdt_getprop(fdt, enet_node, "phy-handle", NULL);
-		if (!phyh)
-			continue;
+		if (phy_node < 0) {
+			/*
+			 * This part is only for old device tree without
+			 * sgmii_phy nodes. It's kept just for compatible
+			 * reason. Soon to be deprecated if all device tree
+			 * get updated.
+			 */
+			phyh = fdt_getprop(fdt, enet_node, "phy-handle", NULL);
+			if (!phyh)
+				continue;
 
-		phynode = fdt_node_offset_by_phandle(fdt, fdt32_to_cpu(*phyh));
+			phy_node = fdt_node_offset_by_phandle(fdt,
+					fdt32_to_cpu(*phyh));
 
-		priv = dev->priv;
+			priv = dev->priv;
 
-		if (priv->flags & TSEC_SGMII)
-			fdt_setprop_cell(fdt, phynode, "reg", priv->phyaddr);
+			if (priv->flags & TSEC_SGMII)
+				fdt_setprop_cell(fdt, phy_node, "reg",
+						priv->phyaddr);
+		} else {
+			fdt_setprop(fdt, enet_node, "phy-handle", &ph,
+					sizeof(ph));
+			fdt_setprop_string(fdt, enet_node,
+					"phy-connection-type",
+					phy_string_for_interface(
+						PHY_INTERFACE_MODE_SGMII));
+		}
 	}
 }