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clocksource/drivers/sysctr: Add nxp system counter timer driver support

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The system counter (sys_ctr) is a programmable system counter
which provides a shared time base to the Cortex A15, A7, A53 etc cores.
It is intended for use in applications where the counter is always
powered on and supports multiple, unrelated clocks. The sys_ctr hardware
supports:
 - 56-bit counter width (roll-over time greater than 40 years)
 - compare frame(64-bit compare value) contains programmable interrupt
   generation when compare value <= counter value.

[dlezcano] Fixed over 80 chars length warning

Signed-off-by: Bai Ping <ping.bai@nxp.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Bai Ping
2019-06-05 06:40:52 +00:00
committed by Daniel Lezcano
parent 668f870f98
commit 7117a44bc0
4 changed files with 178 additions and 0 deletions
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7
drivers/clocksource/Kconfig
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@@ -617,6 +617,13 @@ config CLKSRC_IMX_TPM
Enable this option to use IMX Timer/PWM Module (TPM) timer as
clocksource.
config TIMER_IMX_SYS_CTR
bool "i.MX system counter timer" if COMPILE_TEST
select TIMER_OF
help
Enable this option to use i.MX system counter timer as a
clockevent.
config CLKSRC_ST_LPC
bool "Low power clocksource found in the LPC" if COMPILE_TEST
select TIMER_OF if OF