path: root/Documentation/networking
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authorVince Bridgers <vbridgers2013@gmail.com>2014-07-29 15:19:59 -0500
committerDavid S. Miller <davem@davemloft.net>2014-07-30 20:00:22 -0700
commit49193a66f00148443288a83c6ac377a641b10bd5 (patch)
treef1b7d87f00ab699c665418eee323acced26ac83f /Documentation/networking
parent19936942a1a30ce387ea3782b508ac72957b2293 (diff)
Documentation: networking: phy.txt: Update text for indirect MMD access
Update the PHY library documentation to describe how a specific PHY driver can use the PAL MMD register access routines or override those routines with it's own in the event the PHY does not support the IEEE standard for reading and writing MMD phy registers. Signed-off-by: Vince Bridgers <vbridgers2013@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
1 files changed, 17 insertions, 1 deletions
diff --git a/Documentation/networking/phy.txt b/Documentation/networking/phy.txt
index 3544c98401fd..e839e7efc835 100644
--- a/Documentation/networking/phy.txt
+++ b/Documentation/networking/phy.txt
@@ -272,6 +272,8 @@ Writing a PHY driver
txtsamp: Requests a transmit timestamp at the PHY level for a 'skb'
set_wol: Enable Wake-on-LAN at the PHY level
get_wol: Get the Wake-on-LAN status at the PHY level
+ read_mmd_indirect: Read PHY MMD indirect register
+ write_mmd_indirect: Write PHY MMD indirect register
Of these, only config_aneg and read_status are required to be
assigned by the driver code. The rest are optional. Also, it is
@@ -284,7 +286,21 @@ 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)
+ not been tested as of this writing).
+ The PHY's MMD register accesses are handled by the PAL framework
+ by default, but can be overridden by a specific PHY driver if
+ required. This could be the case if a PHY was released for
+ manufacturing before the MMD PHY register definitions were
+ standardized by the IEEE. Most modern PHYs will be able to use
+ the generic PAL framework for accessing the PHY's MMD registers.
+ An example of such usage is for Energy Efficient Ethernet support,
+ implemented in the PAL. This support uses the PAL to access MMD
+ registers for EEE query and configuration if the PHY supports
+ the IEEE standard access mechanisms, or can use the PHY's specific
+ access interfaces if overridden by the specific PHY driver. See
+ the Micrel driver in drivers/net/phy/ for an example of how this
+ can be implemented.
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