On 04/16/2012 06:03 PM, David Daney wrote:
From: David Daney<david.daney@xxxxxxxxxx>
Add of_mdio_find_bus() which allows an mii_bus to be located given its
associated the device tree node.
This is needed by the follow-on patch to add a driver for MDIO bus
multiplexers.
The of_mdiobus_register() function is modified so that the device tree
node is recorded in the mii_bus. Then we can find it again by
iterating over all mdio_bus_class devices.
Because the OF device tree has now become an integral part of the
kernel, this can live in mdio_bus.c (which contains the needed
mdio_bus_class structure) instead of of_mdio.c.
Signed-off-by: David Daney<david.daney@xxxxxxxxxx>
Cc: Grant Likely<grant.likely@xxxxxxxxxxxx>
Cc: "David S. Miller"<davem@xxxxxxxxxxxxx>
---
drivers/net/phy/mdio_bus.c | 32 ++++++++++++++++++++++++++++++++
drivers/of/of_mdio.c | 2 ++
include/linux/of_mdio.h | 2 ++
3 files changed, 36 insertions(+), 0 deletions(-)
diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
index 8985cc6..46e7dc5 100644
--- a/drivers/net/phy/mdio_bus.c
+++ b/drivers/net/phy/mdio_bus.c
@@ -88,6 +88,38 @@ static struct class mdio_bus_class = {
.dev_release = mdiobus_release,
};
+#ifdef CONFIG_OF_MDIO
+/* Helper function for of_phy_find_device */
This comment is incorrect. I will resend the set with this cleaned up.
David Daney
+static int of_mii_bus_match(struct device *dev, void *mii_bus_np)
+{
+ return dev->of_node == mii_bus_np;
+}
+/**
+ * of_mdio_find_bus - Given an mii_bus node, find the mii_bus.
+ * @mdio_np: Pointer to the mii_bus.
+ *
+ * Returns a pointer to the mii_bus, or NULL if none found.
+ *
+ * Because the association of a device_node and mii_bus is made via
+ * of_mdiobus_register(), the mii_bus cannot be found before it is
+ * registered with of_mdiobus_register().
+ *
+ */
+struct mii_bus *of_mdio_find_bus(struct device_node *mdio_np)
+{
[...]
