net: phy: rework Kconfig settings for MDIO_BUS

I still see build errors in randconfig builds and have had this
patch for a while to locally work around it:

drivers/built-in.o: In function `xgene_mdio_probe':
mux-core.c:(.text+0x352154): undefined reference to `of_mdiobus_register'
mux-core.c:(.text+0x352168): undefined reference to `mdiobus_free'
mux-core.c:(.text+0x3521c0): undefined reference to `mdiobus_alloc_size'

The idea is that CONFIG_MDIO_BUS now reflects whether the mdio_bus
code is built-in or a module, and other drivers that use the core
code can simply depend on that, instead of having a complex
dependency line.

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

diff --git a/drivers/net/phy/Kconfig b/drivers/net/phy/Kconfig
index 2dda72004a7d5ba0ede8fb34c853bce2266ace4a..928fd892f167546e329f913ec10ea56e454cea0d 100644 (file)
--- a/drivers/net/phy/Kconfig
+++ b/drivers/net/phy/Kconfig
@@ -7,7 +7,16 @@ menuconfig MDIO_DEVICE
        help
           MDIO devices and driver infrastructure code.
 
-if MDIO_DEVICE
+config MDIO_BUS
+       tristate
+       default m if PHYLIB=m
+       default MDIO_DEVICE
+       help
+         This internal symbol is used for link time dependencies and it
+         reflects whether the mdio_bus/mdio_device code is built as a
+         loadable module or built-in.
+
+if MDIO_BUS
 
 config MDIO_BCM_IPROC
        tristate "Broadcom iProc MDIO bus controller"
@@ -28,7 +37,6 @@ config MDIO_BCM_UNIMAC
 
 config MDIO_BITBANG
        tristate "Bitbanged MDIO buses"
-       depends on !(MDIO_DEVICE=y && PHYLIB=m)
        help
          This module implements the MDIO bus protocol in software,
          for use by low level drivers that export the ability to
@@ -127,7 +135,6 @@ config MDIO_THUNDER
        tristate "ThunderX SOCs MDIO buses"
        depends on 64BIT
        depends on PCI
-       depends on !(MDIO_DEVICE=y && PHYLIB=m)
        select MDIO_CAVIUM
        help
          This driver supports the MDIO interfaces found on Cavium