powerpc/cell: Fix dependency in cpufreq

cbe_cpufreq has a partial dependency on cbe_cpufreq_pmi, which cannot
be easily expressed in Kconfig. This fixes it by introducing an
extra Kconfig symbol CBE_CPUFREQ_PMI_ENABLE. To make the dependency
clearer, turn PPC_PMI into an automatic symbol.

Reported-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 18 insertions, 4 deletions

diff --git a/arch/powerpc/platforms/cell/Kconfig b/arch/powerpc/platforms/cell/Kconfig
index 5cc3279559a4..037f59a4bfe7 100644
--- a/arch/powerpc/platforms/cell/Kconfig
+++ b/arch/powerpc/platforms/cell/Kconfig
@@ -98,7 +98,7 @@ config PPC_IBM_CELL_RESETBUTTON
 
 config PPC_IBM_CELL_POWERBUTTON
         tristate "IBM Cell Blade power button"
-        depends on PPC_IBM_CELL_BLADE && PPC_PMI && INPUT_EVDEV
+        depends on PPC_IBM_CELL_BLADE && INPUT_EVDEV
         default y
         help
           Support Powerbutton on IBM Cell blades.
@@ -118,9 +118,9 @@ config CBE_CPUFREQ
           For details, take a look at <file:Documentation/cpu-freq/>.
           If you don't have such processor, say N
 
-config CBE_CPUFREQ_PMI
-        tristate "CBE frequency scaling using PMI interface"
-        depends on CBE_CPUFREQ && PPC_PMI && EXPERIMENTAL
+config CBE_CPUFREQ_PMI_ENABLE
+        bool "CBE frequency scaling using PMI interface"
+        depends on CBE_CPUFREQ && EXPERIMENTAL
         default n
         help
           Select this, if you want to use the PMI interface
@@ -128,6 +128,20 @@ config CBE_CPUFREQ_PMI
           processor will not only be able to run at lower speed,
           but also at lower core voltage.
 
+config CBE_CPUFREQ_PMI
+        tristate
+        depends on CBE_CPUFREQ_PMI_ENABLE
+        default CBE_CPUFREQ
+
+config PPC_PMI
+        tristate
+        default y
+        depends on CBE_CPUFREQ_PMI || PPC_IBM_CELL_POWERBUTTON
+        help
+          PMI (Platform Management Interrupt) is a way to
+          communicate with the BMC (Baseboard Management Controller).
+          It is used in some IBM Cell blades.
+
 config CBE_CPUFREQ_SPU_GOVERNOR
         tristate "CBE frequency scaling based on SPU usage"
         depends on SPU_FS && CPU_FREQ