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From:   rentao.bupt@gmail.com
To:     Andrew Lunn <andrew@lunn.ch>,
        "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Heyi Guo <guoheyi@linux.alibaba.com>,
        Dylan Hung <dylan_hung@aspeedtech.com>,
        Guangbin Huang <huangguangbin2@huawei.com>,
        Liang He <windhl@126.com>, Hao Chen <chenhao288@hisilicon.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Joel Stanley <joel@jms.id.au>,
        Andrew Jeffery <andrew@aj.id.au>, Tao Ren <taoren@fb.com>,
        netdev@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org
Cc:     Tao Ren <rentao.bupt@gmail.com>
Subject: [PATCH net-next v3 1/2] net: ftgmac100: support fixed link
Date:   Tue,  6 Sep 2022 22:44:52 -0700
Message-Id: <20220907054453.20016-2-rentao.bupt@gmail.com>
In-Reply-To: <20220907054453.20016-1-rentao.bupt@gmail.com>
References: <20220907054453.20016-1-rentao.bupt@gmail.com>
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From: Tao Ren <rentao.bupt@gmail.com>

Support fixed link in ftgmac100 driver. Fixed link is used on several
Meta OpenBMC platforms, such as Elbert (AST2620) and Wedge400 (AST2520).

Signed-off-by: Tao Ren <rentao.bupt@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
---
 Changes in v3: None
 Changes in v2: None

 drivers/net/ethernet/faraday/ftgmac100.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c
index 9277d5fb5052..da04beee5865 100644
--- a/drivers/net/ethernet/faraday/ftgmac100.c
+++ b/drivers/net/ethernet/faraday/ftgmac100.c
@@ -1701,10 +1701,14 @@ static int ftgmac100_setup_mdio(struct net_device *netdev)
 
 static void ftgmac100_phy_disconnect(struct net_device *netdev)
 {
+	struct ftgmac100 *priv = netdev_priv(netdev);
+
 	if (!netdev->phydev)
 		return;
 
 	phy_disconnect(netdev->phydev);
+	if (of_phy_is_fixed_link(priv->dev->of_node))
+		of_phy_deregister_fixed_link(priv->dev->of_node);
 }
 
 static void ftgmac100_destroy_mdio(struct net_device *netdev)
@@ -1867,6 +1871,26 @@ static int ftgmac100_probe(struct platform_device *pdev)
 			err = -EINVAL;
 			goto err_phy_connect;
 		}
+	} else if (np && of_phy_is_fixed_link(np)) {
+		struct phy_device *phy;
+
+		err = of_phy_register_fixed_link(np);
+		if (err) {
+			dev_err(&pdev->dev, "Failed to register fixed PHY\n");
+			goto err_phy_connect;
+		}
+
+		phy = of_phy_get_and_connect(priv->netdev, np,
+					     &ftgmac100_adjust_link);
+		if (!phy) {
+			dev_err(&pdev->dev, "Failed to connect to fixed PHY\n");
+			of_phy_deregister_fixed_link(np);
+			err = -EINVAL;
+			goto err_phy_connect;
+		}
+
+		/* Display what we found */
+		phy_attached_info(phy);
 	} else if (np && of_get_property(np, "phy-handle", NULL)) {
 		struct phy_device *phy;
 
-- 
2.37.3