diff mbox series

[v2,net-next,04/11] net: phy: Add phy_standalone sysfs entry

Message ID 1559065097-31832-5-git-send-email-ioana.ciornei@nxp.com
State Accepted
Delegated to: David Miller
Headers show
Series Decoupling PHYLINK from struct net_device | expand

Commit Message

Ioana Ciornei May 28, 2019, 5:38 p.m. UTC 
Export a phy_standalone device attribute that is meant to give the
indication that this PHY lacks an attached_dev and its corresponding
sysfs link. The attribute will be created only when the
phy_attach_direct() function will be called with a NULL net_device.

Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
Changes in v2:
 - add new entry in Documentation/ABI/testing/sysfs-class-net-phydev

 Documentation/ABI/testing/sysfs-class-net-phydev |  8 ++++++++
 drivers/net/phy/phy_device.c                     | 22 ++++++++++++++++++++++
 2 files changed, 30 insertions(+)
diff mbox series

Patch

diff --git a/Documentation/ABI/testing/sysfs-class-net-phydev b/Documentation/ABI/testing/sysfs-class-net-phydev
index 6ebabfb27912..b7c46c2f3fd0 100644
--- a/Documentation/ABI/testing/sysfs-class-net-phydev
+++ b/Documentation/ABI/testing/sysfs-class-net-phydev
@@ -34,3 +34,11 @@  Description:
 		xgmii, moca, qsgmii, trgmii, 1000base-x, 2500base-x, rxaui,
 		xaui, 10gbase-kr, unknown
 
+What:		/sys/class/mdio_bus/<bus>/<device>/phy_standalone
+Date:		May 2019
+KernelVersion:	5.3
+Contact:	netdev@vger.kernel.org
+Description:
+		Boolean value indicating whether the PHY device is used in
+		standalone mode, without a net_device associated, by PHYLINK.
+		Attribute created only when this is the case.
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 1b540ed9b326..8b4fc3b4f269 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1164,6 +1164,16 @@  static void phy_sysfs_create_links(struct phy_device *phydev)
 	phydev->sysfs_links = true;
 }
 
+static ssize_t
+phy_standalone_show(struct device *dev, struct device_attribute *attr,
+		    char *buf)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+
+	return sprintf(buf, "%d\n", !phydev->attached_dev);
+}
+static DEVICE_ATTR_RO(phy_standalone);
+
 /**
  * phy_attach_direct - attach a network device to a given PHY device pointer
  * @dev: network device to attach
@@ -1253,6 +1263,13 @@  int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
 
 	phy_sysfs_create_links(phydev);
 
+	if (!phydev->attached_dev) {
+		err = sysfs_create_file(&phydev->mdio.dev.kobj,
+					&dev_attr_phy_standalone.attr);
+		if (err)
+			phydev_err(phydev, "error creating 'phy_standalone' sysfs entry\n");
+	}
+
 	phydev->dev_flags = flags;
 
 	phydev->interface = interface;
@@ -1380,6 +1397,11 @@  void phy_detach(struct phy_device *phydev)
 			sysfs_remove_link(&dev->dev.kobj, "phydev");
 		sysfs_remove_link(&phydev->mdio.dev.kobj, "attached_dev");
 	}
+
+	if (!phydev->attached_dev)
+		sysfs_remove_file(&phydev->mdio.dev.kobj,
+				  &dev_attr_phy_standalone.attr);
+
 	phy_suspend(phydev);
 	if (dev) {
 		phydev->attached_dev->phydev = NULL;