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authorAndy Fleming <afleming@freescale.com>2008-04-18 17:29:54 -0500
committerJeff Garzik <jgarzik@redhat.com>2008-04-25 02:08:52 -0400
commitf62220d3a9ccb879c3f90f845ae57b724b7bbb62 (patch)
tree72697d5d0b7bfdebaf0fd74bea07212c9820a6df /Documentation/networking/phy.txt
parent8ec7226a93dcd4a314e2387d1033aef01145061b (diff)
downloadlinux-f62220d3a9ccb879c3f90f845ae57b724b7bbb62.tar.bz2
phylib: Add support for board-level PHY fixups
Sometimes the specific interaction between the platform and the PHY requires special handling. For instance, to change where the PHY's clock input is, or to add a delay to account for latency issues in the data path. We add a mechanism for registering a callback with the PHY Lib to be called on matching PHYs when they are brought up, or reset. Signed-off-by: Andy Fleming <afleming@freescale.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'Documentation/networking/phy.txt')
-rw-r--r--Documentation/networking/phy.txt38
1 files changed, 37 insertions, 1 deletions
diff --git a/Documentation/networking/phy.txt b/Documentation/networking/phy.txt
index 0bc95eab1512..8df6a7b0e66c 100644
--- a/Documentation/networking/phy.txt
+++ b/Documentation/networking/phy.txt
@@ -1,7 +1,7 @@
-------
PHY Abstraction Layer
-(Updated 2006-11-30)
+(Updated 2008-04-08)
Purpose
@@ -291,3 +291,39 @@ Writing a PHY driver
Feel free to look at the Marvell, Cicada, and Davicom drivers in
drivers/net/phy/ for examples (the lxt and qsemi drivers have
not been tested as of this writing)
+
+Board Fixups
+
+ Sometimes the specific interaction between the platform and the PHY requires
+ special handling. For instance, to change where the PHY's clock input is,
+ or to add a delay to account for latency issues in the data path. In order
+ to support such contingencies, the PHY Layer allows platform code to register
+ fixups to be run when the PHY is brought up (or subsequently reset).
+
+ When the PHY Layer brings up a PHY it checks to see if there are any fixups
+ registered for it, matching based on UID (contained in the PHY device's phy_id
+ field) and the bus identifier (contained in phydev->dev.bus_id). Both must
+ match, however two constants, PHY_ANY_ID and PHY_ANY_UID, are provided as
+ wildcards for the bus ID and UID, respectively.
+
+ When a match is found, the PHY layer will invoke the run function associated
+ with the fixup. This function is passed a pointer to the phy_device of
+ interest. It should therefore only operate on that PHY.
+
+ The platform code can either register the fixup using phy_register_fixup():
+
+ int phy_register_fixup(const char *phy_id,
+ u32 phy_uid, u32 phy_uid_mask,
+ int (*run)(struct phy_device *));
+
+ Or using one of the two stubs, phy_register_fixup_for_uid() and
+ phy_register_fixup_for_id():
+
+ int phy_register_fixup_for_uid(u32 phy_uid, u32 phy_uid_mask,
+ int (*run)(struct phy_device *));
+ int phy_register_fixup_for_id(const char *phy_id,
+ int (*run)(struct phy_device *));
+
+ The stubs set one of the two matching criteria, and set the other one to
+ match anything.
+