netdev/phy: add MDIO bus multiplexer driven by a memory-mapped device
Add support for an MDIO bus multiplexer controlled by a simple memory-mapped
device, like an FPGA. The device must be memory-mapped and contain only
8-bit registers (which keeps things simple).
Tested on a Freescale P5020DS board which uses the "PIXIS" FPGA attached
to the localbus.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 3090dc6..983bbf4 100644
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -159,6 +159,19 @@
several child MDIO busses to a parent bus. Child bus
selection is under the control of GPIO lines.
+config MDIO_BUS_MUX_MMIOREG
+ tristate "Support for MMIO device-controlled MDIO bus multiplexers"
+ depends on OF_MDIO
+ select MDIO_BUS_MUX
+ help
+ This module provides a driver for MDIO bus multiplexers that
+ are controlled via a simple memory-mapped device, like an FPGA.
+ The multiplexer connects one of several child MDIO busses to a
+ parent bus. Child bus selection is under the control of one of
+ the FPGA's registers.
+
+ Currently, only 8-bit registers are supported.
+
endif # PHYLIB
config MICREL_KS8995MA