Blackfin: add support for gptimer0 as a tick source

For systems where the core cycles are not a usable tick source (like SMP
or cycles gets updated), enable gptimer0 as an alternative.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 22 insertions, 10 deletions

diff --git a/arch/blackfin/Kconfig b/arch/blackfin/Kconfig
index cea2bfd64a56..c04e7a4836f2 100644
--- a/arch/blackfin/Kconfig
+++ b/arch/blackfin/Kconfig
@@ -241,12 +241,6 @@ config IRQ_PER_CPU
         depends on SMP
         default y
 
-config TICK_SOURCE_SYSTMR0
-        bool
-        select BFIN_GPTIMERS
-        depends on SMP
-        default y
-
 config BF_REV_MIN
         int
         default 0 if (BF51x || BF52x || (BF54x && !BF54xM))
@@ -607,7 +601,6 @@ source kernel/Kconfig.hz
 
 config GENERIC_TIME
         bool "Generic time"
-        depends on !SMP
         default y
 
 config GENERIC_CLOCKEVENTS
@@ -615,12 +608,26 @@ config GENERIC_CLOCKEVENTS
         depends on GENERIC_TIME
         default y
 
+choice
+        prompt "Kernel Tick Source"
+        depends on GENERIC_CLOCKEVENTS
+        default TICKSOURCE_CORETMR
+
+config TICKSOURCE_GPTMR0
+        bool "Gptimer0 (SCLK domain)"
+        select BFIN_GPTIMERS
+        depends on !IPIPE
+
+config TICKSOURCE_CORETMR
+        bool "Core timer (CCLK domain)"
+
+endchoice
+
 config CYCLES_CLOCKSOURCE
-        bool "Use 'CYCLES' as a clocksource (EXPERIMENTAL)"
-        depends on EXPERIMENTAL
+        bool "Use 'CYCLES' as a clocksource"
         depends on GENERIC_CLOCKEVENTS
         depends on !BFIN_SCRATCH_REG_CYCLES
-        default n
+        depends on !SMP
         help
           If you say Y here, you will enable support for using the 'cycles'
           registers as a clock source.  Doing so means you will be unable to
@@ -628,6 +635,11 @@ config CYCLES_CLOCKSOURCE
           still be able to read it (such as for performance monitoring), but
           writing the registers will most likely crash the kernel.
 
+config GPTMR0_CLOCKSOURCE
+        bool "Use GPTimer0 as a clocksource (higher rating)"
+        depends on GENERIC_CLOCKEVENTS
+        depends on !TICKSOURCE_GPTMR0
+
 source kernel/time/Kconfig
 
 comment "Misc"