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Subject[PATCH net-next 10/10] net: mscc: ocelot: make use of SerDes PHYs for handling their configuration
Date
Previously, the SerDes muxing was hardcoded to a given mode in the MAC
controller driver. Now, the SerDes muxing is configured within the
Device Tree and is enforced in the MAC controller driver so we can have
a lot of different SerDes configurations.

Make use of the SerDes PHYs in the MAC controller to set up the SerDes
according to the SerDes<->switch port mapping and the communication mode
with the Ethernet PHY.

Signed-off-by: Quentin Schulz <quentin.schulz@bootlin.com>
---
drivers/net/ethernet/mscc/Kconfig | 2 +-
drivers/net/ethernet/mscc/ocelot.c | 16 ++++++++-
drivers/net/ethernet/mscc/ocelot.h | 5 +++-
drivers/net/ethernet/mscc/ocelot_board.c | 43 +++++++++++++++++++------
4 files changed, 55 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/mscc/Kconfig b/drivers/net/ethernet/mscc/Kconfig
index 36c8462..bcec058 100644
--- a/drivers/net/ethernet/mscc/Kconfig
+++ b/drivers/net/ethernet/mscc/Kconfig
@@ -23,6 +23,8 @@ config MSCC_OCELOT_SWITCH
config MSCC_OCELOT_SWITCH_OCELOT
tristate "Ocelot switch driver on Ocelot"
depends on MSCC_OCELOT_SWITCH
+ depends on GENERIC_PHY
+ depends on OF_NET
help
This driver supports the Ocelot network switch device as present on
the Ocelot SoCs.
diff --git a/drivers/net/ethernet/mscc/ocelot.c b/drivers/net/ethernet/mscc/ocelot.c
index 1a4f2bb..8f11fdb 100644
--- a/drivers/net/ethernet/mscc/ocelot.c
+++ b/drivers/net/ethernet/mscc/ocelot.c
@@ -472,6 +472,7 @@ static int ocelot_port_open(struct net_device *dev)
{
struct ocelot_port *port = netdev_priv(dev);
struct ocelot *ocelot = port->ocelot;
+ enum phy_mode phy_mode;
int err;

/* Enable receiving frames on the port, and activate auto-learning of
@@ -482,8 +483,21 @@ static int ocelot_port_open(struct net_device *dev)
ANA_PORT_PORT_CFG_PORTID_VAL(port->chip_port),
ANA_PORT_PORT_CFG, port->chip_port);

+ if (port->serdes) {
+ if (port->phy_mode == PHY_INTERFACE_MODE_SGMII)
+ phy_mode = PHY_MODE_SGMII;
+ else
+ phy_mode = PHY_MODE_QSGMII;
+
+ err = phy_set_mode(port->serdes, phy_mode);
+ if (err) {
+ netdev_err(dev, "Could not set mode of SerDes\n");
+ return err;
+ }
+ }
+
err = phy_connect_direct(dev, port->phy, &ocelot_port_adjust_link,
- PHY_INTERFACE_MODE_NA);
+ port->phy_mode);
if (err) {
netdev_err(dev, "Could not attach to PHY\n");
return err;
diff --git a/drivers/net/ethernet/mscc/ocelot.h b/drivers/net/ethernet/mscc/ocelot.h
index 3720e51..62c7c8e 100644
--- a/drivers/net/ethernet/mscc/ocelot.h
+++ b/drivers/net/ethernet/mscc/ocelot.h
@@ -11,6 +11,8 @@
#include <linux/bitops.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
+#include <linux/phy.h>
+#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>

@@ -453,6 +455,9 @@ struct ocelot_port {
u8 vlan_aware;

u64 *stats;
+
+ phy_interface_t phy_mode;
+ struct phy *serdes;
};

u32 __ocelot_read_ix(struct ocelot *ocelot, u32 reg, u32 offset);
diff --git a/drivers/net/ethernet/mscc/ocelot_board.c b/drivers/net/ethernet/mscc/ocelot_board.c
index b7d755b..3bb71b7 100644
--- a/drivers/net/ethernet/mscc/ocelot_board.c
+++ b/drivers/net/ethernet/mscc/ocelot_board.c
@@ -6,6 +6,7 @@
*/
#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/of_net.h>
#include <linux/netdevice.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
@@ -247,18 +248,12 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
INIT_LIST_HEAD(&ocelot->multicast);
ocelot_init(ocelot);

- ocelot_rmw(ocelot, HSIO_HW_CFG_DEV1G_4_MODE |
- HSIO_HW_CFG_DEV1G_6_MODE |
- HSIO_HW_CFG_DEV1G_9_MODE,
- HSIO_HW_CFG_DEV1G_4_MODE |
- HSIO_HW_CFG_DEV1G_6_MODE |
- HSIO_HW_CFG_DEV1G_9_MODE,
- HSIO_HW_CFG);
-
for_each_available_child_of_node(ports, portnp) {
struct device_node *phy_node;
struct phy_device *phy;
struct resource *res;
+ struct phy *serdes;
+ enum phy_mode phy_mode;
void __iomem *regs;
char res_name[8];
u32 port;
@@ -283,10 +278,38 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
continue;

err = ocelot_probe_port(ocelot, port, regs, phy);
- if (err) {
- dev_err(&pdev->dev, "failed to probe ports\n");
+ if (err)
+ return err;
+
+ err = of_get_phy_mode(portnp);
+ if (err < 0)
+ ocelot->ports[port]->phy_mode = PHY_INTERFACE_MODE_NA;
+ else
+ ocelot->ports[port]->phy_mode = err;
+
+ if (ocelot->ports[port]->phy_mode == PHY_INTERFACE_MODE_NA)
+ continue;
+
+ if (ocelot->ports[port]->phy_mode == PHY_INTERFACE_MODE_SGMII)
+ phy_mode = PHY_MODE_SGMII;
+ else
+ phy_mode = PHY_MODE_QSGMII;
+
+ serdes = devm_of_phy_get(ocelot->dev, portnp, NULL);
+ if (IS_ERR(serdes)) {
+ if (PTR_ERR(serdes) == -EPROBE_DEFER) {
+ dev_err(ocelot->dev, "deferring probe\n");
+ err = -EPROBE_DEFER;
+ goto err_probe_ports;
+ }
+
+ dev_err(ocelot->dev, "missing SerDes phys for port%d\n",
+ port);
+ err = -ENODEV;
goto err_probe_ports;
}
+
+ ocelot->ports[port]->serdes = serdes;
}

register_netdevice_notifier(&ocelot_netdevice_nb);
--
git-series 0.9.1
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