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authorDavid Brownell <dbrownell@users.sourceforge.net>2008-07-23 21:26:48 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:13 -0700
commit9483a578df27fe7603605d565eefe039c1ba5845 (patch)
treee8f071d503b26d23d22556ec5d115cd67a45d47c /arch/Kconfig
parentd7ce20b2024d318b9ba88859226af1441270d99f (diff)
downloadlwn-9483a578df27fe7603605d565eefe039c1ba5845.tar.gz
lwn-9483a578df27fe7603605d565eefe039c1ba5845.zip
add HAVE_CLK to Kconfig, for driver dependencies
Flag platforms as HAVE_CLK (or not) in Kconfig, based on whether they support <linux/clk.h> calls, so that otherwise portable drivers which need those calls can list that dependency. Something like this is a prerequisite for merging the musb_hdrc driver, currently used on platforms including Davinci, OMAP2430, OMAP3xx ... and the discrete TUSB6010 chip, which doesn't have a natural platform dependency. (Used with OMAP 2420 in current Nokia N8x0 tablets.) Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Cc: Russell King <rmk@arm.linux.org.uk> Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/Kconfig')
-rw-r--r--arch/Kconfig7
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index ad89a33d8c6e..4d5ebbc1e72b 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -42,3 +42,10 @@ config HAVE_DMA_ATTRS
config USE_GENERIC_SMP_HELPERS
def_bool n
+
+config HAVE_CLK
+ def_bool n
+ help
+ The <linux/clk.h> calls support software clock gating and
+ thus are a key power management tool on many systems.
+