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Date: Fri, 10 Jul 2020 22:01:13 +0530
From: Calvin Johnson <calvin.johnson@....nxp.com>
To: Jeremy Linton <jeremy.linton@....com>,
Russell King - ARM Linux admin <linux@...linux.org.uk>,
Jon <jon@...id-run.com>,
Cristi Sovaiala <cristian.sovaiala@....com>,
Ioana Ciornei <ioana.ciornei@....com>,
Andrew Lunn <andrew@...n.ch>,
Andy Shevchenko <andy.shevchenko@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Madalin Bucur <madalin.bucur@....nxp.com>
Cc: netdev@...r.kernel.org, linux.cj@...il.com,
linux-acpi@...r.kernel.org,
Calvin Johnson <calvin.johnson@....nxp.com>
Subject: [net-next PATCH v5 4/6] net: phy: introduce phy_find_by_mdio_handle()
The PHYs on an mdiobus are probed and registered using mdiobus_register().
Later, for connecting these PHYs to MAC, the PHYs registered on the
mdiobus have to be referenced.
For each MAC node, a property "mdio-handle" is used to reference the
MDIO bus on which the PHYs are registered. On getting hold of the MDIO
bus, use phy_find_by_fwnode() to get the PHY connected to the MAC.
Introduce fwnode_mdio_find_bus() to find the mii_bus that corresponds
to given mii_bus fwnode.
Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
---
Changes in v5:
- rename phy_find_by_fwnode() to phy_find_by_mdio_handle()
- add docment for phy_find_by_mdio_handle()
- error out DT in phy_find_by_mdio_handle()
- clean up err return
Changes in v4:
- release fwnode_mdio after use
- return ERR_PTR instead of NULL
Changes in v3:
- introduce fwnode_mdio_find_bus()
- renamed and improved phy_find_by_fwnode()
Changes in v2: None
drivers/net/phy/mdio_bus.c | 25 ++++++++++++++++++++++
drivers/net/phy/phy_device.c | 40 ++++++++++++++++++++++++++++++++++++
include/linux/phy.h | 2 ++
3 files changed, 67 insertions(+)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 2b6f22e64ad1..e87da427fdcd 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -435,6 +435,31 @@ struct mii_bus *of_mdio_find_bus(struct device_node *mdio_bus_np)
}
EXPORT_SYMBOL(of_mdio_find_bus);
+/**
+ * fwnode_mdio_find_bus - Given an mii_bus fwnode, find the mii_bus.
+ * @mdio_bus_fwnode: fwnode of the mii_bus.
+ *
+ * Returns a reference to the mii_bus, or NULL if none found. The
+ * embedded struct device will have its reference count incremented,
+ * and this must be put once the bus is finished with.
+ *
+ * Because the association of a fwnode and mii_bus is made via
+ * mdiobus_register(), the mii_bus cannot be found before it is
+ * registered with mdiobus_register().
+ *
+ */
+struct mii_bus *fwnode_mdio_find_bus(struct fwnode_handle *mdio_bus_fwnode)
+{
+ struct device *d;
+
+ if (!mdio_bus_fwnode)
+ return NULL;
+
+ d = class_find_device_by_fwnode(&mdio_bus_class, mdio_bus_fwnode);
+ return d ? to_mii_bus(d) : NULL;
+}
+EXPORT_SYMBOL(fwnode_mdio_find_bus);
+
/* Walk the list of subnodes of a mdio bus and look for a node that
* matches the mdio device's address with its 'reg' property. If
* found, set the of_node pointer for the mdio device. This allows
diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 7cda95330aea..00b2ade9714f 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -23,8 +23,10 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/netdevice.h>
+#include <linux/of.h>
#include <linux/phy.h>
#include <linux/phy_led_triggers.h>
+#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/sfp.h>
#include <linux/skbuff.h>
@@ -964,6 +966,44 @@ struct phy_device *phy_find_first(struct mii_bus *bus)
}
EXPORT_SYMBOL(phy_find_first);
+/**
+ * phy_find_by_mdio_handle - get phy device from mdio-handle and phy-channel
+ * @fwnode: a pointer to a &struct fwnode_handle to get mdio-handle and
+ * phy-channel
+ *
+ * Find fwnode_mdio using mdio-handle reference. Using fwnode_mdio get the
+ * mdio bus. Property phy-channel provides the phy address on the mdio bus.
+ * Pass mdio bus and phy address to mdiobus_get_phy() and get corresponding
+ * phy_device. This method is used for ACPI and not for DT.
+ *
+ * Returns pointer to the phy device on success, else ERR_PTR.
+ */
+struct phy_device *phy_find_by_mdio_handle(struct fwnode_handle *fwnode)
+{
+ struct fwnode_handle *fwnode_mdio;
+ struct mii_bus *mdio;
+ int addr;
+ int err;
+
+ if (is_of_node(fwnode))
+ return ERR_PTR(-EINVAL);
+
+ fwnode_mdio = fwnode_find_reference(fwnode, "mdio-handle", 0);
+ mdio = fwnode_mdio_find_bus(fwnode_mdio);
+ fwnode_handle_put(fwnode_mdio);
+ if (!mdio)
+ return ERR_PTR(-ENODEV);
+
+ err = fwnode_property_read_u32(fwnode, "phy-channel", &addr);
+ if (err)
+ return ERR_PTR(err);
+ if (addr < 0 || addr >= PHY_MAX_ADDR)
+ return ERR_PTR(-EINVAL);
+
+ return mdiobus_get_phy(mdio, addr);
+}
+EXPORT_SYMBOL(phy_find_by_mdio_handle);
+
static void phy_link_change(struct phy_device *phydev, bool up)
{
struct net_device *netdev = phydev->attached_dev;
diff --git a/include/linux/phy.h b/include/linux/phy.h
index 0403eb799913..fd383a22eb61 100644
--- a/include/linux/phy.h
+++ b/include/linux/phy.h
@@ -334,6 +334,7 @@ static inline struct mii_bus *devm_mdiobus_alloc(struct device *dev)
}
struct mii_bus *mdio_find_bus(const char *mdio_name);
+struct mii_bus *fwnode_mdio_find_bus(struct fwnode_handle *mdio_bus_fwnode);
struct phy_device *mdiobus_scan(struct mii_bus *bus, int addr);
#define PHY_INTERRUPT_DISABLED false
@@ -1245,6 +1246,7 @@ int phy_sfp_probe(struct phy_device *phydev,
struct phy_device *phy_attach(struct net_device *dev, const char *bus_id,
phy_interface_t interface);
struct phy_device *phy_find_first(struct mii_bus *bus);
+struct phy_device *phy_find_by_mdio_handle(struct fwnode_handle *fwnode);
int phy_attach_direct(struct net_device *dev, struct phy_device *phydev,
u32 flags, phy_interface_t interface);
int phy_connect_direct(struct net_device *dev, struct phy_device *phydev,
--
2.17.1
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