Merge branch 'net-phy-improve-PM-handling-of-PHY-MDIO'

Heiner Kallweit says:

====================
net: phy: improve PM handling of PHY/MDIO

Current implementation of MDIO bus PM ops doesn't actually implement
bus-specific PM ops but just calls PM ops defined on a device level
what doesn't seem to be fully in line with the core PM model.

When looking e.g. at __device_suspend() the PM core looks for PM ops
of a device in a specific order:
1. device PM domain
2. device type
3. device class
4. device bus

I think it has good reason that there's no PM ops on device level.
The situation can be improved by modeling PHY's as device type of
a MDIO device. If for some other type of MDIO device PM ops are
needed, it could be modeled as struct device_type as well.
====================

Tested-by: Andrew Lunn <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

drivers/net/phy/mdio_bus.c

@@ -717,58 +717,10 @@ static int mdio_uevent(struct device *dev, struct kobj_uevent_env *env)
 	return 0;
 }
 
-#ifdef CONFIG_PM
-static int mdio_bus_suspend(struct device *dev)
-{
-	struct mdio_device *mdio = to_mdio_device(dev);
-
-	if (mdio->pm_ops && mdio->pm_ops->suspend)
-		return mdio->pm_ops->suspend(dev);
-
-	return 0;
-}
-
-static int mdio_bus_resume(struct device *dev)
-{
-	struct mdio_device *mdio = to_mdio_device(dev);
-
-	if (mdio->pm_ops && mdio->pm_ops->resume)
-		return mdio->pm_ops->resume(dev);
-
-	return 0;
-}
-
-static int mdio_bus_restore(struct device *dev)
-{
-	struct mdio_device *mdio = to_mdio_device(dev);
-
-	if (mdio->pm_ops && mdio->pm_ops->restore)
-		return mdio->pm_ops->restore(dev);
-
-	return 0;
-}
-
-static const struct dev_pm_ops mdio_bus_pm_ops = {
-	.suspend = mdio_bus_suspend,
-	.resume = mdio_bus_resume,
-	.freeze = mdio_bus_suspend,
-	.thaw = mdio_bus_resume,
-	.restore = mdio_bus_restore,
-};
-
-#define MDIO_BUS_PM_OPS (&mdio_bus_pm_ops)
-
-#else
-
-#define MDIO_BUS_PM_OPS NULL
-
-#endif /* CONFIG_PM */
-
 struct bus_type mdio_bus_type = {
 	.name		= "mdio_bus",
 	.match		= mdio_bus_match,
 	.uevent		= mdio_uevent,
-	.pm		= MDIO_BUS_PM_OPS,
 };
 EXPORT_SYMBOL(mdio_bus_type);
 

drivers/net/phy/phy_device.c

@@ -346,6 +346,55 @@ static int phy_bus_match(struct device *dev, struct device_driver *drv)
 	}
 }
 
+static ssize_t
+phy_id_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+
+	return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id);
+}
+static DEVICE_ATTR_RO(phy_id);
+
+static ssize_t
+phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+	const char *mode = NULL;
+
+	if (phy_is_internal(phydev))
+		mode = "internal";
+	else
+		mode = phy_modes(phydev->interface);
+
+	return sprintf(buf, "%s\n", mode);
+}
+static DEVICE_ATTR_RO(phy_interface);
+
+static ssize_t
+phy_has_fixups_show(struct device *dev, struct device_attribute *attr,
+		    char *buf)
+{
+	struct phy_device *phydev = to_phy_device(dev);
+
+	return sprintf(buf, "%d\n", phydev->has_fixups);
+}
+static DEVICE_ATTR_RO(phy_has_fixups);
+
+static struct attribute *phy_dev_attrs[] = {
+	&dev_attr_phy_id.attr,
+	&dev_attr_phy_interface.attr,
+	&dev_attr_phy_has_fixups.attr,
+	NULL,
+};
+ATTRIBUTE_GROUPS(phy_dev);
+
+static const struct device_type mdio_bus_phy_type = {
+	.name = "PHY",
+	.groups = phy_dev_groups,
+	.release = phy_device_release,
+	.pm = MDIO_BUS_PHY_PM_OPS,
+};
+
 struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 				     bool is_c45,
 				     struct phy_c45_device_ids *c45_ids)
@@ -359,11 +408,10 @@ struct phy_device *phy_device_create(struct mii_bus *bus, int addr, int phy_id,
 		return ERR_PTR(-ENOMEM);
 
 	mdiodev = &dev->mdio;
-	mdiodev->dev.release = phy_device_release;
 	mdiodev->dev.parent = &bus->dev;
 	mdiodev->dev.bus = &mdio_bus_type;
+	mdiodev->dev.type = &mdio_bus_phy_type;
 	mdiodev->bus = bus;
-	mdiodev->pm_ops = MDIO_BUS_PHY_PM_OPS;
 	mdiodev->bus_match = phy_bus_match;
 	mdiodev->addr = addr;
 	mdiodev->flags = MDIO_DEVICE_FLAG_PHY;
@@ -587,48 +635,6 @@ struct phy_device *get_phy_device(struct mii_bus *bus, int addr, bool is_c45)
 }
 EXPORT_SYMBOL(get_phy_device);
 
-static ssize_t
-phy_id_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct phy_device *phydev = to_phy_device(dev);
-
-	return sprintf(buf, "0x%.8lx\n", (unsigned long)phydev->phy_id);
-}
-static DEVICE_ATTR_RO(phy_id);
-
-static ssize_t
-phy_interface_show(struct device *dev, struct device_attribute *attr, char *buf)
-{
-	struct phy_device *phydev = to_phy_device(dev);
-	const char *mode = NULL;
-
-	if (phy_is_internal(phydev))
-		mode = "internal";
-	else
-		mode = phy_modes(phydev->interface);
-
-	return sprintf(buf, "%s\n", mode);
-}
-static DEVICE_ATTR_RO(phy_interface);
-
-static ssize_t
-phy_has_fixups_show(struct device *dev, struct device_attribute *attr,
-		    char *buf)
-{
-	struct phy_device *phydev = to_phy_device(dev);
-
-	return sprintf(buf, "%d\n", phydev->has_fixups);
-}
-static DEVICE_ATTR_RO(phy_has_fixups);
-
-static struct attribute *phy_dev_attrs[] = {
-	&dev_attr_phy_id.attr,
-	&dev_attr_phy_interface.attr,
-	&dev_attr_phy_has_fixups.attr,
-	NULL,
-};
-ATTRIBUTE_GROUPS(phy_dev);
-
 /**
  * phy_device_register - Register the phy device on the MDIO bus
  * @phydev: phy_device structure to be added to the MDIO bus
@@ -651,8 +657,6 @@ int phy_device_register(struct phy_device *phydev)
 		goto out;
 	}
 
-	phydev->mdio.dev.groups = phy_dev_groups;
-
 	err = device_add(&phydev->mdio.dev);
 	if (err) {
 		pr_err("PHY %d failed to add\n", phydev->mdio.addr);

include/linux/mdio.h

@@ -29,7 +29,6 @@ enum mdio_mutex_lock_class {
 struct mdio_device {
 	struct device dev;
 
-	const struct dev_pm_ops *pm_ops;
 	struct mii_bus *bus;
 	char modalias[MDIO_NAME_SIZE];