[PATCH net-next v6 4/7] net: mdiobus: search for PSE nodes by parsing PHY nodes.

From: Oleksij Rempel
Date: Wed Sep 21 2022 - 08:49:00 EST


Some PHYs can be linked with PSE (Power Sourcing Equipment), so search
for related nodes and attach it to the phydev.

Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
---
changes v4:
- add Reviewed-by: Andrew Lunn
- put pse_control_put() after unregister_mii_timestamper()
changes v3:
- remove is_acpi_node() check
- rework fwnode_find_pse_control() error handling
---
drivers/net/mdio/fwnode_mdio.c | 34 ++++++++++++++++++++++++++++++++--
drivers/net/phy/phy_device.c | 2 ++
include/linux/phy.h | 2 ++
3 files changed, 36 insertions(+), 2 deletions(-)

diff --git a/drivers/net/mdio/fwnode_mdio.c b/drivers/net/mdio/fwnode_mdio.c
index 7ff7349a27a2..e2c97e207bbd 100644
--- a/drivers/net/mdio/fwnode_mdio.c
+++ b/drivers/net/mdio/fwnode_mdio.c
@@ -10,10 +10,28 @@
#include <linux/fwnode_mdio.h>
#include <linux/of.h>
#include <linux/phy.h>
+#include <linux/pse-pd/pse.h>

MODULE_AUTHOR("Calvin Johnson <calvin.johnson@xxxxxxxxxxx>");
MODULE_LICENSE("GPL");

+static struct pse_control *
+fwnode_find_pse_control(struct fwnode_handle *fwnode)
+{
+ struct pse_control *psec;
+ struct device_node *np;
+
+ np = to_of_node(fwnode);
+ if (!np)
+ return NULL;
+
+ psec = of_pse_control_get(np);
+ if (PTR_ERR(psec) == -ENOENT)
+ return NULL;
+
+ return psec;
+}
+
static struct mii_timestamper *
fwnode_find_mii_timestamper(struct fwnode_handle *fwnode)
{
@@ -91,14 +109,21 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
struct fwnode_handle *child, u32 addr)
{
struct mii_timestamper *mii_ts = NULL;
+ struct pse_control *psec = NULL;
struct phy_device *phy;
bool is_c45 = false;
u32 phy_id;
int rc;

+ psec = fwnode_find_pse_control(child);
+ if (IS_ERR(psec))
+ return PTR_ERR(psec);
+
mii_ts = fwnode_find_mii_timestamper(child);
- if (IS_ERR(mii_ts))
- return PTR_ERR(mii_ts);
+ if (IS_ERR(mii_ts)) {
+ rc = PTR_ERR(mii_ts);
+ goto clean_pse;
+ }

rc = fwnode_property_match_string(child, "compatible",
"ethernet-phy-ieee802.3-c45");
@@ -134,18 +159,23 @@ int fwnode_mdiobus_register_phy(struct mii_bus *bus,
goto clean_phy;
}

+ phy->psec = psec;
+
/* phy->mii_ts may already be defined by the PHY driver. A
* mii_timestamper probed via the device tree will still have
* precedence.
*/
if (mii_ts)
phy->mii_ts = mii_ts;
+
return 0;

clean_phy:
phy_device_free(phy);
clean_mii_ts:
unregister_mii_timestamper(mii_ts);
+clean_pse:
+ pse_control_put(psec);

return rc;
}
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 2198f1302642..2e65a36b4384 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -26,6 +26,7 @@
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/phy_led_triggers.h>
+#include <linux/pse-pd/pse.h>
#include <linux/property.h>
#include <linux/sfp.h>
#include <linux/skbuff.h>
@@ -989,6 +990,7 @@ EXPORT_SYMBOL(phy_device_register);
void phy_device_remove(struct phy_device *phydev)
{
unregister_mii_timestamper(phydev->mii_ts);
+ pse_control_put(phydev->psec);

device_del(&phydev->mdio.dev);

diff --git a/include/linux/phy.h b/include/linux/phy.h
index 337230c135f7..6cc017a1cf44 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -596,6 +596,7 @@ struct macsec_ops;
* @master_slave_get: Current master/slave advertisement
* @master_slave_state: Current master/slave configuration
* @mii_ts: Pointer to time stamper callbacks
+ * @psec: Pointer to Power Sourcing Equipment control struct
* @lock: Mutex for serialization access to PHY
* @state_queue: Work queue for state machine
* @shared: Pointer to private data shared by phys in one package
@@ -709,6 +710,7 @@ struct phy_device {
struct phylink *phylink;
struct net_device *attached_dev;
struct mii_timestamper *mii_ts;
+ struct pse_control *psec;

u8 mdix;
u8 mdix_ctrl;
--
2.30.2