From: Alexandre Belloni Date: Thu, 13 Sep 2018 13:30:22 +0200 Subject: [PATCH 005/342] ARM: at91: Implement clocksource selection Origin: https://git.kernel.org/cgit/linux/kernel/git/rt/linux-stable-rt.git/commit?id=86f4900f6f6c9c8786a1162b473598e6f83fa5fd Allow selecting and unselecting the PIT clocksource driver so it doesn't have to be compile when unused. Tested-by: Alexander Dahl Signed-off-by: Alexandre Belloni Signed-off-by: Sebastian Andrzej Siewior --- arch/arm/mach-at91/Kconfig | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig index 903f23c309df..fa493a86e2bb 100644 --- a/arch/arm/mach-at91/Kconfig +++ b/arch/arm/mach-at91/Kconfig @@ -107,6 +107,31 @@ 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" + depends on SOC_AT91RM9200 || SOC_AT91SAM9 || SOC_SAMA5 || COMPILE_TEST + default SOC_AT91RM9200 || SOC_AT91SAM9 || SOC_SAMA5 + depends on !ATMEL_TCLIB + select ATMEL_ARM_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