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Subject[PATCH v3 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

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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