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    clocksource/drivers/imx-tpm: Add imx tpm timer support · 059ab7b8
    Dong Aisheng authored
    
    
    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: default avatarDong Aisheng <aisheng.dong@nxp.com>
    Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
    059ab7b8