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>

5 files changed, 23 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.
+
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index d048f6887d0b..6fb4f03369f2 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -198,12 +198,14 @@ choice
 config ARCH_AAEC2000
         bool "Agilent AAEC-2000 based"
         select ARM_AMBA
+        select HAVE_CLK
         help
           This enables support for systems based on the Agilent AAEC-2000
 
 config ARCH_INTEGRATOR
         bool "ARM Ltd. Integrator family"
         select ARM_AMBA
+        select HAVE_CLK
         select ICST525
         help
           Support for ARM's Integrator platform.
@@ -211,6 +213,7 @@ config ARCH_INTEGRATOR
 config ARCH_REALVIEW
         bool "ARM Ltd. RealView family"
         select ARM_AMBA
+        select HAVE_CLK
         select ICST307
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
@@ -221,6 +224,7 @@ config ARCH_VERSATILE
         bool "ARM Ltd. Versatile family"
         select ARM_AMBA
         select ARM_VIC
+        select HAVE_CLK
         select ICST307
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
@@ -262,6 +266,8 @@ config ARCH_EP93XX
         select ARM_AMBA
         select ARM_VIC
         select GENERIC_GPIO
+        select HAVE_CLK
+        select HAVE_CLK
         select HAVE_GPIO_LIB
         help
           This enables support for the Cirrus EP93xx series of CPUs.
@@ -381,6 +387,7 @@ config ARCH_NS9XXX
         select GENERIC_GPIO
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
+        select HAVE_CLK
         help
           Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
           System.
@@ -430,6 +437,7 @@ config ARCH_ORION5X
 
 config ARCH_PNX4008
         bool "Philips Nexperia PNX4008 Mobile"
+        select HAVE_CLK
         help
           This enables support for Philips PNX4008 mobile platform.
 
@@ -438,6 +446,7 @@ config ARCH_PXA
         depends on MMU
         select ARCH_MTD_XIP
         select GENERIC_GPIO
+        select HAVE_CLK
         select HAVE_GPIO_LIB
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
@@ -468,6 +477,7 @@ config ARCH_SA1100
         select GENERIC_GPIO
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
+        select HAVE_CLK
         select TICK_ONESHOT
         select HAVE_GPIO_LIB
         help
@@ -476,6 +486,7 @@ config ARCH_SA1100
 config ARCH_S3C2410
         bool "Samsung S3C2410, S3C2412, S3C2413, S3C2440, S3C2442, S3C2443"
         select GENERIC_GPIO
+        select HAVE_CLK
         help
           Samsung S3C2410X CPU based systems, such as the Simtec Electronics
           BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
@@ -503,12 +514,14 @@ config ARCH_DAVINCI
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
         select GENERIC_GPIO
+        select HAVE_CLK
         help
           Support for TI's DaVinci platform.
 
 config ARCH_OMAP
         bool "TI OMAP"
         select GENERIC_GPIO
+        select HAVE_CLK
         select HAVE_GPIO_LIB
         select GENERIC_TIME
         select GENERIC_CLOCKEVENTS
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 45d63c986015..df4adefedb42 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -10,6 +10,7 @@ config AVR32
         # With EMBEDDED=n, we get lots of stuff automatically selected
         # that we usually don't need on AVR32.
         select EMBEDDED
+        select HAVE_CLK
         select HAVE_OPROFILE
         select HAVE_KPROBES
         help
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 737ebf9d12bb..4d7e2ba10bae 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -843,6 +843,7 @@ source "crypto/Kconfig"
 config PPC_CLOCK
         bool
         default n
+        select HAVE_CLK
 
 config PPC_LIB_RHEAP
         bool
diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig
index 3e7384f4619c..8879938f3356 100644
--- a/arch/sh/Kconfig
+++ b/arch/sh/Kconfig
@@ -8,6 +8,7 @@ mainmenu "Linux/SuperH Kernel Configuration"
 config SUPERH
         def_bool y
         select EMBEDDED
+        select HAVE_CLK
         select HAVE_IDE
         select HAVE_OPROFILE
         help