[PATCH 06/12] ARM: at91: Implement clocksource selection
From: Alexandre Belloni
Date: Wed Apr 03 2019 - 10:12:03 EST
Allow selecting and unselecting the PIT clocksource driver so it doesn't
have to be compiled when unused.
Signed-off-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>
arch/arm/mach-at91/Kconfig | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 903f23c309df..da1d97a06c53 100644
@@ -107,6 +107,29 @@ config SOC_AT91SAM9
+comment "Clocksource driver selection"
+ bool "Periodic Interval Timer (PIT) support"
+ depends on SOC_AT91SAM9 || SOC_SAMA5
+ default SOC_AT91SAM9 || SOC_SAMA5
+ select ATMEL_PIT
+ Select this to get a clocksource based on the Atmel Periodic Interval
+ Timer. It has a relatively low resolution and the TC Block clocksource
+ should be preferred.
+ bool "Timer Counter Blocks (TCB) support"
+ default SOC_AT91RM9200 || SOC_AT91SAM9 || SOC_SAMA5
+ select ATMEL_TCB_CLKSRC
+ Select this to get a high precision clocksource based on a
+ TC block with a 5+ MHz base clock rate.
+ On platforms with 16-bit counters, two timer channels are combined
+ to make a single 32-bit timer.
+ It can also be used as a clock event device supporting oneshot mode.