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    Subject[PATCH v5 0/3] netdev/of/phy: MDIO bus multiplexer support.
    From: David Daney <>

    This code has been working well for about six months on a couple of
    different configurations (boards), so I thought it would be a good
    time to send it out again, and I hope get it on the path towards

    v5: Correct Kconfig depends in 3/3 as noticed by David Miller.

    v4: Correct some comment text and rename a couple of variables to
    better reflect their purpose.

    v3: Update binding to use "mdio-mux-gpio" compatible property.
    Cleanups suggested by Grant Likely. Now uses the driver probe
    deferral mechanism if GPIOs or parent bus not available.

    v2: Update bindings to use "reg" and "mdio-parent-bus" instead of
    "cell-index" and "parent-bus"


    We have several different boards with a multiplexer in the MDIO bus.
    There is an MDIO bus controller connected to a switching device with
    several child MDIO busses.

    Everything is wired up using device tree bindings.

    1/3 - New of_mdio_find_bus() function used to help configuring the
    driver topology.

    2/3 - MDIO bus multiplexer framework.

    3/3 - A driver for a GPIO controlled multiplexer.

    David Daney (3):
    netdev/of/phy: New function: of_mdio_find_bus().
    netdev/of/phy: Add MDIO bus multiplexer support.
    netdev/of/phy: Add MDIO bus multiplexer driven by GPIO lines.

    .../devicetree/bindings/net/mdio-mux-gpio.txt | 127 +++++++++++++
    Documentation/devicetree/bindings/net/mdio-mux.txt | 136 ++++++++++++++
    drivers/net/phy/Kconfig | 18 ++
    drivers/net/phy/Makefile | 2 +
    drivers/net/phy/mdio-mux-gpio.c | 142 +++++++++++++++
    drivers/net/phy/mdio-mux.c | 192 ++++++++++++++++++++
    drivers/net/phy/mdio_bus.c | 32 ++++
    drivers/of/of_mdio.c | 2 +
    include/linux/mdio-mux.h | 21 ++
    include/linux/of_mdio.h | 2 +
    10 files changed, 674 insertions(+), 0 deletions(-)
    create mode 100644 Documentation/devicetree/bindings/net/mdio-mux-gpio.txt
    create mode 100644 Documentation/devicetree/bindings/net/mdio-mux.txt
    create mode 100644 drivers/net/phy/mdio-mux-gpio.c
    create mode 100644 drivers/net/phy/mdio-mux.c
    create mode 100644 include/linux/mdio-mux.h


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