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clocksource/drivers/imx-tpm: Add imx tpm timer support

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IMX Timer/PWM Module (TPM) supports both timer and pwm function while
this patch only adds the timer support. PWM would be added later.

The TPM counter, compare and capture registers are clocked by an
asynchronous clock that can remain enabled in low power modes.

NOTE: We observed in a very small probability, the bus fabric
contention between GPU and A7 may results a few cycles delay
of writing CNT registers which may cause the min_delta event got
missed, so we need add a ETIME check here in case it happened.

Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Shawn Guo <shawnguo@kernel.org>
Cc: Anson Huang <Anson.Huang@nxp.com>
Cc: Bai Ping <ping.bai@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Dong Aisheng
2017-08-01 16:40:17 +08:00
committed by Daniel Lezcano
parent 34b0c26cd5
commit 059ab7b82e
3 changed files with 248 additions and 0 deletions
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8
drivers/clocksource/Kconfig
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@@ -598,6 +598,14 @@ config CLKSRC_IMX_GPT
depends on ARM && CLKDEV_LOOKUP
select CLKSRC_MMIO
config CLKSRC_IMX_TPM
bool "Clocksource using i.MX TPM" if COMPILE_TEST
depends on ARM && CLKDEV_LOOKUP && GENERIC_CLOCKEVENTS
select CLKSRC_MMIO
help
Enable this option to use IMX Timer/PWM Module (TPM) timer as
clocksource.
config CLKSRC_ST_LPC
bool "Low power clocksource found in the LPC" if COMPILE_TEST
select TIMER_OF if OF