netdev - [PATCH 04/11] net: phy: Add phy

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Message-Id: <1558992127-26008-5-git-send-email-ioana.ciornei@nxp.com>
Date:   Tue, 28 May 2019 00:22:00 +0300
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     linux@...linux.org.uk, f.fainelli@...il.com, andrew@...n.ch,
        hkallweit1@...il.com, maxime.chevallier@...tlin.com,
        olteanv@...il.com, thomas.petazzoni@...tlin.com,
        davem@...emloft.net, vivien.didelot@...il.com
Cc:     netdev@...r.kernel.org, Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH 04/11] net: phy: Add phy_standalone sysfs entry

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@....com>
---
 drivers/net/phy/phy_device.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 0b7730fd41ba..711971897e10 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;
-- 
2.21.0