linux-dev - Linux kernel development work

Age	Commit message (Collapse)	Author	Files	Lines
2016-06-10	mdio: mux: Enhanced MDIO mux framework for integrated multiplexers	Pramod Kumar	1	-1/+3
	An integrated multiplexer uses same address space for "muxed bus selection" and "generation of mdio transaction" hence its good to register parent bus from mux driver. Hence added a mechanism where mux driver could register a parent bus and pass it down to framework via mdio_mux_init api. Signed-off-by: Pramod Kumar <pramod.kumar@broadcom.com> Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012-05-07	netdev/of/phy: Add MDIO bus multiplexer support.	David Daney	1	-0/+21
	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>