[POWERPC] OF helpers for the GPIO API

This implements various helpers to support OF bindings for the GPIO
LIB API.

Previously this was PowerPC specific, but it seems this code isn't
arch-dependent anyhow, so let's place it into of/.

SPARC will not see this addition yet, real hardware seem to not use
GPIOs at all. But this might change:

   http://www.leox.org/docs/faq_MLleon.html

"16-bit I/O port" sounds promising. :-)

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
index c03072b12f42..3354ad766a49 100644
--- a/drivers/of/Kconfig
+++ b/drivers/of/Kconfig
@@ -1,3 +1,9 @@
 config OF_DEVICE
         def_bool y
         depends on OF && (SPARC || PPC_OF)
+
+config OF_GPIO
+        def_bool y
+        depends on OF && PPC_OF && HAVE_GPIO_LIB
+        help
+          OpenFirmware GPIO accessors