ARM: at91: Implement clocksource selection

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@bootlin.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 903f23c309df8bcfba40b8b49076c662c3a13960..da1d97a06c53ae305a0decd4cdd30d99393eb72c 100644 (file)
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -107,6 +107,29 @@ config SOC_AT91SAM9
            AT91SAM9X35
            AT91SAM9XE
 
+comment "Clocksource driver selection"
+
+config ATMEL_CLOCKSOURCE_PIT
+       bool "Periodic Interval Timer (PIT) support"
+       depends on SOC_AT91SAM9 || SOC_SAMA5
+       default SOC_AT91SAM9 || SOC_SAMA5
+       select ATMEL_PIT
+       help
+         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.
+
+config ATMEL_CLOCKSOURCE_TCB
+       bool "Timer Counter Blocks (TCB) support"
+       default SOC_AT91RM9200 || SOC_AT91SAM9 || SOC_SAMA5
+       select ATMEL_TCB_CLKSRC
+       help
+         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.
+
 config HAVE_AT91_UTMI
        bool