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Subject[PATCH net-next v6 3/3] net: ethernet: ti: am65-cpsw: Add support for SERDES configuration
Date
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().

Add new member "serdes_phy" to struct "am65_cpsw_slave_data" to store the
SERDES PHY for each port, if it exists. Use it later while disabling the
SERDES PHY for each port.

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@ti.com>
---
drivers/net/ethernet/ti/am65-cpsw-nuss.c | 68 ++++++++++++++++++++++++
drivers/net/ethernet/ti/am65-cpsw-nuss.h | 1 +
2 files changed, 69 insertions(+)

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
index 06912363d5d5..1bd11166dc28 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
@@ -1416,6 +1416,68 @@ static const struct net_device_ops am65_cpsw_nuss_netdev_ops = {
.ndo_setup_tc = am65_cpsw_qos_ndo_setup_tc,
};

+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 am65_cpsw_port *port;
+ struct phy *phy;
+ int i;
+
+ for (i = 0; i < common->port_num; i++) {
+ port = &common->ports[i];
+ phy = port->slave.serdes_phy;
+ if (phy)
+ am65_cpsw_disable_phy(phy);
+ }
+}
+
+static int am65_cpsw_init_serdes_phy(struct device *dev, struct device_node *port_np,
+ struct am65_cpsw_port *port)
+{
+ 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;
+
+ /* Serdes PHY exists. Store it. */
+ port->slave.serdes_phy = phy;
+
+ 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)
{
@@ -1959,6 +2021,11 @@ static int am65_cpsw_nuss_init_slave_ports(struct am65_cpsw_common *common)
goto of_node_put;
}

+ /* Initialize the Serdes PHY for the port */
+ ret = am65_cpsw_init_serdes_phy(dev, port_np, port);
+ if (ret)
+ return ret;
+
port->slave.mac_only =
of_property_read_bool(port_np, "ti,mac-only");

@@ -2878,6 +2945,7 @@ static int am65_cpsw_nuss_remove(struct platform_device *pdev)
*/
am65_cpsw_nuss_cleanup_ndev(common);
am65_cpsw_nuss_phylink_cleanup(common);
+ am65_cpsw_disable_serdes_phy(common);

of_platform_device_destroy(common->mdio_dev, NULL);

diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.h b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
index 4b75620f8d28..ed26768a6e51 100644
--- a/drivers/net/ethernet/ti/am65-cpsw-nuss.h
+++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.h
@@ -32,6 +32,7 @@ struct am65_cpsw_slave_data {
struct device_node *phy_node;
phy_interface_t phy_if;
struct phy *ifphy;
+ struct phy *serdes_phy;
bool rx_pause;
bool tx_pause;
u8 mac_addr[ETH_ALEN];
--
2.25.1
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