netdev - [PATCH v3 3/3] net: ethernet: ti: am65-cpsw: Add support for SERDES configuration

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Date:   Wed, 26 Oct 2022 14:39:57 +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>, <vigneshr@...com>, <nsekhar@...com>
CC:     <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <s-vadapalli@...com>
Subject: [PATCH v3 3/3] net: ethernet: ti: am65-cpsw: Add support for SERDES configuration

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

Define the functions am65_cpsw_disable_phy(), am65_cpsw_enable_phy(),
am65_cpsw_disable_serdes_phy() and am65_cpsw_enable_serdes_phy().

Power on and initialize the SerDes PHY in am65_cpsw_nuss_init_slave_ports()
by invoking am65_cpsw_enable_serdes_phy().

Power off the SerDes PHY in am65_cpsw_nuss_remove() by invoking
am65_cpsw_disable_serdes_phy().

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---
 drivers/net/ethernet/ti/am65-cpsw-nuss.c | 65 ++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 91e294afc3ad..519ebd371dd8 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1403,6 +1403,65 @@ 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 void am65_cpsw_disable_serdes_phy(struct am65_cpsw_common *common)
+{
+	struct device_node *node, *port_np;
+	struct device *dev = common->dev;
+	const char *name = "serdes-phy";
+	struct phy *phy;
+
+	node = of_get_child_by_name(dev->of_node, "ethernet-ports");
+
+	for_each_child_of_node(node, port_np) {
+		phy = devm_of_phy_get(dev, port_np, name);
+		am65_cpsw_disable_phy(phy);
+	}
+}
+
+static int am65_cpsw_init_serdes_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)
 {
@@ -1880,6 +1939,11 @@ 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_serdes_phy(dev, port_np);
+		if (ret)
+			return ret;
+
 		port->slave.mac_only =
 				of_property_read_bool(port_np, "ti,mac-only");
 
@@ -2833,6 +2897,7 @@ static int am65_cpsw_nuss_remove(struct platform_device *pdev)
 
 	am65_cpsw_nuss_phylink_cleanup(common);
 	am65_cpsw_unregister_devlink(common);
+	am65_cpsw_disable_serdes_phy(common);
 	am65_cpsw_unregister_notifiers(common);
 
 	/* must unregister ndevs here because DD release_driver routine calls
-- 
2.25.1