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| author | David Daney <david.daney@cavium.com> | 2012-05-02 15:16:38 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-05-07 22:58:09 -0400 |
| commit | 0ca2997d145268e6b4ef000692061849cdab8348 (patch) | |
| tree | deeca7985f029cae477945e988816889c986e263 /drivers/net/phy/Kconfig | |
| parent | 251060220021283eef3652145a41f5b26db97ce5 (diff) | |
| download | linux-0ca2997d145268e6b4ef000692061849cdab8348.tar.gz linux-0ca2997d145268e6b4ef000692061849cdab8348.tar.bz2 linux-0ca2997d145268e6b4ef000692061849cdab8348.zip | |
netdev/of/phy: Add MDIO bus multiplexer support.
This patch adds a somewhat generic framework for MDIO bus
multiplexers. It is modeled on the I2C multiplexer.
The multiplexer is needed if there are multiple PHYs with the same
address connected to the same MDIO bus adepter, or if there is
insufficient electrical drive capability for all the connected PHY
devices.
Conceptually it could look something like this:
------------------
| Control Signal |
--------+---------
|
--------------- --------+------
| MDIO MASTER |---| Multiplexer |
--------------- --+-------+----
| |
C C
h h
i i
l l
d d
| |
--------- A B ---------
| | | | | |
| PHY@1 +-------+ +---+ PHY@1 |
| | | | | |
--------- | | ---------
--------- | | ---------
| | | | | |
| PHY@2 +-------+ +---+ PHY@2 |
| | | |
--------- ---------
This framework configures the bus topology from device tree data. The
mechanics of switching the multiplexer is left to device specific
drivers.
The follow-on patch contains a multiplexer driven by GPIO lines.
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/Kconfig')
| -rw-r--r-- | drivers/net/phy/Kconfig | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig index 0e01f4e5cd64..99c0674a5935 100644 --- a/drivers/net/phy/Kconfig +++ b/drivers/net/phy/Kconfig @@ -135,6 +135,15 @@ config MDIO_OCTEON If in doubt, say Y. +config MDIO_BUS_MUX + tristate + depends on OF_MDIO + help + This module provides a driver framework for MDIO bus + multiplexers which connect one of several child MDIO busses + to a parent bus. Switching between child busses is done by + device specific drivers. + endif # PHYLIB config MICREL_KS8995MA |