clocksource: sti: Provide support for the ST LPC Clocksource IP
This IP is shared with Watchdog and RTC functionality. All 3 of these devices are mutually exclusive from one another i.e. Only 1 IP can be used at any given time. We use the device-driver model combined with a DT 'mode' property to enforce this. The ST LPC Clocksource IP can be used as the system (tick) timer. Acked-by: NDaniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: NLee Jones <lee.jones@linaro.org>
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