net: mvmdio: new Marvell MDIO driver

This patch adds a separate driver for the MDIO interface of the
Marvell Ethernet controllers. There are two reasons to have a separate
driver rather than including it inside the MAC driver itself:

 *) The MDIO interface is shared by all Ethernet ports, so a driver
    must guarantee non-concurrent accesses to this MDIO interface. The
    most logical way is to have a separate driver that handles this
    single MDIO interface, used by all Ethernet ports.

 *) The MDIO interface is the same between the existing mv643xx_eth
    driver and the new mvneta driver. Even though it is for now only
    used by the mvneta driver, it will in the future be used by the
    mv643xx_eth driver as well.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Acked-by: David S. Miller <davem@davemloft.net>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/net/ethernet/marvell/Kconfig b/drivers/net/ethernet/marvell/Kconfig
index 0029934748bc..232ccb3cb08b 100644
--- a/drivers/net/ethernet/marvell/Kconfig
+++ b/drivers/net/ethernet/marvell/Kconfig
@@ -31,6 +31,17 @@ config MV643XX_ETH
           Some boards that use the Discovery chipset are the Momenco
           Ocelot C and Jaguar ATX and Pegasos II.
 
+config MVMDIO
+        tristate "Marvell MDIO interface support"
+        ---help---
+          This driver supports the MDIO interface found in the network
+          interface units of the Marvell EBU SoCs (Kirkwood, Orion5x,
+          Dove, Armada 370 and Armada XP).
+
+          For now, this driver is only needed for the MVNETA driver
+          (used on Armada 370 and XP), but it could be used in the
+          future by the MV643XX_ETH driver.
+
 config PXA168_ETH
         tristate "Marvell pxa168 ethernet support"
         depends on CPU_PXA168