clocksource: tcb_clksrc: Make tc_mode interrupt safe
tc_mode() can be called from interrupt context and thus must not call clk_*prepare*() functions. Signed-off-by: NDavid Jander <david@protonic.nl> Signed-off-by: NDaniel Lezcano <daniel.lezcano@linaro.org> Acked-by: NAlexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by: NNicolas Ferre <nicolas.ferre@atmel.com>
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