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add HAVE_CLK to Kconfig, for driver dependencies

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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 <[email protected]>
Cc: Russell King <[email protected]>
Acked-by: Haavard Skinnemoen <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Paul Mackerras <[email protected]>
Cc: Paul Mundt <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
David Brownell 2008-07-23 21:26:48 -07:00 • committed by Linus Torvalds
commit 9483a578df
5 changed files with 23 additions and 0 deletions
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7
arch/Kconfig
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@ -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.