netdev - [PATCH 2/8] net: ethernet: ti: am65-cpsw: Add support for SERDES configuration

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Date:   Wed, 14 Sep 2022 15:20:47 +0530
From:   Siddharth Vadapalli <s-vadapalli@...com>
To:     <davem@...emloft.net>, <edumazet@...gle.com>, <kuba@...nel.org>,
        <pabeni@...hat.com>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski@...aro.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <linux@...linux.org.uk>,
        <vladimir.oltean@....com>, <grygorii.strashko@...com>,
        <vigneshr@...com>, <nsekhar@...com>
CC:     <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <kishon@...com>,
        <s-vadapalli@...com>
Subject: [PATCH 2/8] net: ethernet: ti: am65-cpsw: Add support for SERDES configuration

Use PHY framework APIs to initialize the SERDES connected to CPSW.

Define the functions am65_cpsw_init_phy(), am65_cpsw_enable_phy() and
am65_cpsw_disable_phy() and invoke in am65_cpsw_nuss_init_slave_ports(),
am65_cpsw_mac_link_up() and am65_cpsw_mac_link_down() respectively.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 55 ++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 7ef5d8208a4e..4e06def3b0de 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1404,6 +1404,50 @@ static const struct net_device_ops am65_cpsw_nuss_netdev_ops = {
 	.ndo_get_devlink_port   = am65_cpsw_ndo_get_devlink_port,
 };
 
+static void am65_cpsw_disable_phy(struct phy *phy)
+{
+	phy_power_off(phy);
+	phy_exit(phy);
+}
+
+static int am65_cpsw_enable_phy(struct phy *phy)
+{
+	int ret;
+
+	ret = phy_init(phy);
+	if (ret < 0)
+		return ret;
+
+	ret = phy_power_on(phy);
+	if (ret < 0) {
+		phy_exit(phy);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int am65_cpsw_init_phy(struct device *dev, struct device_node *port_np)
+{
+	const char *name = "serdes-phy";
+	struct phy *phy;
+	int ret;
+
+	phy = devm_of_phy_get(dev, port_np, name);
+	if (PTR_ERR(phy) == -ENODEV)
+		return 0;
+
+	ret =  am65_cpsw_enable_phy(phy);
+	if (ret < 0)
+		goto err_phy;
+
+	return 0;
+
+err_phy:
+	devm_phy_put(dev, phy);
+	return ret;
+}
+
 static void am65_cpsw_nuss_mac_config(struct phylink_config *config, unsigned int mode,
 				      const struct phylink_link_state *state)
 {
@@ -1427,6 +1471,9 @@ static void am65_cpsw_nuss_mac_link_down(struct phylink_config *config, unsigned
 	struct net_device *ndev = port->ndev;
 	int tmo;
 
+	/* disable phy */
+	am65_cpsw_disable_phy(port->slave.ifphy);
+
 	/* disable forwarding */
 	cpsw_ale_control_set(common->ale, port->port_id, ALE_PORT_STATE, ALE_PORT_STATE_DISABLE);
 
@@ -1472,6 +1519,9 @@ static void am65_cpsw_nuss_mac_link_up(struct phylink_config *config, struct phy
 
 	cpsw_sl_ctl_set(port->slave.mac_sl, mac_control);
 
+	/* enable phy */
+	am65_cpsw_enable_phy(port->slave.ifphy);
+
 	/* enable forwarding */
 	cpsw_ale_control_set(common->ale, port->port_id, ALE_PORT_STATE, ALE_PORT_STATE_FORWARD);
 
@@ -1881,6 +1931,11 @@ static int am65_cpsw_nuss_init_slave_ports(struct am65_cpsw_common *common)
 			goto of_node_put;
 		}
 
+		/* Initialize the phy for the port */
+		ret = am65_cpsw_init_phy(dev, port_np);
+		if (ret)
+			return ret;
+
 		port->slave.mac_only =
 				of_property_read_bool(port_np, "ti,mac-only");
 
-- 
2.25.1