dsa: Allow core and drivers to be built as modules

Change the kconfig types to tristate and adjust the condition for
declaring net_device::dsa_ptr to allow for this.

Adjust the makefile so that if NET_DSA_MV88E6123_61_65=y and
NET_DSA_MV88E6131=m or vice versa then both drivers are built-in.  We
could leave these options as bool and make NET_DSA_MV88E6XXX a
user-selected option, but that would break existing configurations.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 11 insertions, 7 deletions

diff --git a/net/dsa/Kconfig b/net/dsa/Kconfig
index c53ded2a98df..7e12303827e8 100644
--- a/net/dsa/Kconfig
+++ b/net/dsa/Kconfig
@@ -1,5 +1,5 @@
 menuconfig NET_DSA
-        bool "Distributed Switch Architecture support"
+        tristate "Distributed Switch Architecture support"
         default n
         depends on EXPERIMENTAL && NETDEVICES && !S390
         select PHYLIB
@@ -26,11 +26,11 @@ config NET_DSA_TAG_TRAILER
 
 # switch drivers
 config NET_DSA_MV88E6XXX
-        bool
+        tristate
         default n
 
 config NET_DSA_MV88E6060
-        bool "Marvell 88E6060 ethernet switch chip support"
+        tristate "Marvell 88E6060 ethernet switch chip support"
         select NET_DSA_TAG_TRAILER
         ---help---
           This enables support for the Marvell 88E6060 ethernet switch
@@ -41,7 +41,7 @@ config NET_DSA_MV88E6XXX_NEED_PPU
         default n
 
 config NET_DSA_MV88E6131
-        bool "Marvell 88E6085/6095/6095F/6131 ethernet switch chip support"
+        tristate "Marvell 88E6085/6095/6095F/6131 ethernet switch chip support"
         select NET_DSA_MV88E6XXX
         select NET_DSA_MV88E6XXX_NEED_PPU
         select NET_DSA_TAG_DSA
@@ -50,7 +50,7 @@ config NET_DSA_MV88E6131
           ethernet switch chips.
 
 config NET_DSA_MV88E6123_61_65
-        bool "Marvell 88E6123/6161/6165 ethernet switch chip support"
+        tristate "Marvell 88E6123/6161/6165 ethernet switch chip support"
         select NET_DSA_MV88E6XXX
         select NET_DSA_TAG_EDSA
         ---help---
diff --git a/net/dsa/Makefile b/net/dsa/Makefile
index 5c48ac556997..191dd482e557 100644
--- a/net/dsa/Makefile
+++ b/net/dsa/Makefile
@@ -11,5 +11,9 @@ dsa_core-$(CONFIG_NET_DSA_TAG_TRAILER) += tag_trailer.o
 obj-$(CONFIG_NET_DSA_MV88E6060) += mv88e6060.o
 obj-$(CONFIG_NET_DSA_MV88E6XXX) += mv88e6xxx_drv.o
 mv88e6xxx_drv-y += mv88e6xxx.o
-mv88e6xxx_drv-$(CONFIG_NET_DSA_MV88E6123_61_65) += mv88e6123_61_65.o
-mv88e6xxx_drv-$(CONFIG_NET_DSA_MV88E6131) += mv88e6131.o
+ifdef CONFIG_NET_DSA_MV88E6123_61_65
+mv88e6xxx_drv-y += mv88e6123_61_65.o
+endif
+ifdef CONFIG_NET_DSA_MV88E6131
+mv88e6xxx_drv-y += mv88e6131.o
+endif