From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Fri, 13 May 2016 21:01:19 +0200
Subject: ar71xx: fix qca956x ethernet initialization

Complete internal switch initialization for QCA956X.
Set default mdio device if the interface mode of GE0 is not SGMII (fix ticket #21520).

Signed-off-by: Weijie Gao <hackpascal@gmail.com>

Backport of OpenWrt r48937

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
index 12a376e..b43c80a 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/dev-eth.c
@@ -271,6 +271,7 @@ void __init ath79_register_mdio(unsigned int id, u32 phy_mask)
 	case ATH79_SOC_QCA956X:
 		if (id == 1)
 			mdio_data->builtin_switch = 1;
+		mdio_data->is_ar934x = 1;
 		break;
 
 	default:
@@ -1123,16 +1124,25 @@ void __init ath79_register_eth(unsigned int id)
 		if (id == 0) {
 			pdata->reset_bit = QCA955X_RESET_GE0_MAC |
 					   QCA955X_RESET_GE0_MDIO;
+
 			if (pdata->phy_if_mode == PHY_INTERFACE_MODE_SGMII)
 				pdata->set_speed = qca956x_set_speed_sgmii;
 			else
-				/* FIXME */
-				pdata->set_speed = ath79_set_speed_dummy;
+				pdata->set_speed = ath79_set_speed_ge0;
 		} else {
 			pdata->reset_bit = QCA955X_RESET_GE1_MAC |
 					   QCA955X_RESET_GE1_MDIO;
-			/* FIXME */
+
 			pdata->set_speed = ath79_set_speed_dummy;
+
+			pdata->switch_data = &ath79_switch_data;
+
+			pdata->speed = SPEED_1000;
+			pdata->duplex = DUPLEX_FULL;
+
+			/* reset the built-in switch */
+			ath79_device_reset_set(AR934X_RESET_ETH_SWITCH);
+			ath79_device_reset_clear(AR934X_RESET_ETH_SWITCH);
 		}
 
 		pdata->ddr_flush = ath79_ddr_no_flush;
@@ -1196,6 +1206,11 @@ void __init ath79_register_eth(unsigned int id)
 			/* don't assign any MDIO device by default */
 			break;
 
+		case ATH79_SOC_QCA956X:
+			if (pdata->phy_if_mode != PHY_INTERFACE_MODE_SGMII)
+				pdata->mii_bus_dev = &ath79_mdio1_device.dev;
+			break;
+
 		default:
 			pdata->mii_bus_dev = &ath79_mdio0_device.dev;
 			break;