net: phy: Allow building mdio-boardinfo into the kernel

mdio-boardinfo contains code that is helpful for platforms to register
specific MDIO bus devices independent of how CONFIG_MDIO_DEVICE or
CONFIG_PHYLIB will be selected (modular or built-in). In order to make
that possible, let's do the following:

- descend into drivers/net/phy/ unconditionally

- make mdiobus_setup_mdiodev_from_board_info() take a callback argument
  which allows us not to expose the internal MDIO board info list and
  mutex, yet maintain the logic within the same file

- relocate the code that creates a MDIO device into
  drivers/net/phy/mdio_bus.c

- build mdio-boardinfo.o into the kernel as soon as MDIO_DEVICE is
  defined (y or m)

Fixes: 90eff9096c01 ("net: phy: Allow splitting MDIO bus/device support from PHYs")
Fixes: 648ea0134069 ("net: phy: Allow pre-declaration of MDIO devices")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Tested-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 0e1ec0438c23..e36db9a2ba38 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -1,7 +1,11 @@
 # Makefile for Linux PHY drivers and MDIO bus drivers
 
 libphy-y			:= phy.o phy-core.o phy_device.o
-mdio-bus-y			+= mdio_bus.o mdio_device.o mdio-boardinfo.o
+mdio-bus-y			+= mdio_bus.o mdio_device.o
+
+ifdef CONFIG_MDIO_DEVICE
+obj-y				+= mdio-boardinfo.o
+endif
 
 # PHYLIB implies MDIO_DEVICE, in that case, we have a bunch of circular
 # dependencies that does not make it possible to split mdio-bus objects into a