dsa: Hide core config options; make drivers select what they need

Commit 82167cb8c6b2f8166d5c7532e5ef4b5e0cc46a72 ('net: dsa/slave: Fix
compilation warnings') fixed one possible invalid configuration
(NET_DSA enabled with no trailer formats) but added others: drivers
can select NET_DSA without its dependencies being met.

It's not very useful to make either the DSA core or the tagging
formats manually selectable without a driver to use them, so:

1. Define a hidden HAVE_NET_DSA option and move the dependencies of
   NET_DSA to that.  While we're at it, drop the deprecated
   EXPERIMENTAL dependency.
2. Make NET_DSA and the drivers dependent on HAVE_NET_DSA.
3. Hide the tagging format options again.
4. Make drivers select both NET_DSA and the appropriate tagging format
   option.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/net/dsa/Kconfig b/drivers/net/dsa/Kconfig
index 96eae22f612b..b8fe808b7957 100644
--- a/drivers/net/dsa/Kconfig
+++ b/drivers/net/dsa/Kconfig
@@ -1,4 +1,5 @@
 menu "Distributed Switch Architecture drivers"
+        depends on HAVE_NET_DSA
 
 config NET_DSA_MV88E6XXX
         tristate
@@ -6,6 +7,7 @@ config NET_DSA_MV88E6XXX
 
 config NET_DSA_MV88E6060
         tristate "Marvell 88E6060 ethernet switch chip support"
+        select NET_DSA
         select NET_DSA_TAG_TRAILER
         ---help---
           This enables support for the Marvell 88E6060 ethernet switch
@@ -17,6 +19,7 @@ config NET_DSA_MV88E6XXX_NEED_PPU
 
 config NET_DSA_MV88E6131
         tristate "Marvell 88E6085/6095/6095F/6131 ethernet switch chip support"
+        select NET_DSA
         select NET_DSA_MV88E6XXX
         select NET_DSA_MV88E6XXX_NEED_PPU
         select NET_DSA_TAG_DSA
@@ -26,6 +29,7 @@ config NET_DSA_MV88E6131
 
 config NET_DSA_MV88E6123_61_65
         tristate "Marvell 88E6123/6161/6165 ethernet switch chip support"
+        select NET_DSA
         select NET_DSA_MV88E6XXX
         select NET_DSA_TAG_EDSA
         ---help---