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Yann Gautier 6f4572bd78 Introduce timeout_init_us/timeout_elapsed() delay tracking with CNTPCT. 
timeout_init_us(some_timeout_us); returns a reference to detect
timeout for the provided microsecond delay value from current time.

timeout_elapsed(reference) return true/false whether the reference
timeout is elapsed.

This change is inspired by the OP-TEE OS timeout resources [1].

 [1] https://github.com/OP-TEE/optee_os/blob/3.4.0/core/arch/arm/include/kernel/delay.h#L45

Change-Id: Id81ff48aa49693f555dc621064878417101d5587
Signed-off-by: Yann Gautier <yann.gautier@st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
 		2019-02-14 11:20:23 +01:00
..
include Introduce timeout_init_us/timeout_elapsed() delay tracking with CNTPCT. 2019-02-14 11:20:23 +01:00
bl2_io_storage.c stm32mp1: remove some dependencies on clocks and reset in drivers 2019-02-14 11:20:23 +01:00
stm32mp_common.c stm32mp1: remove some dependencies on clocks and reset in drivers 2019-02-14 11:20:23 +01:00
stm32mp_dt.c stm32mp1: remove some dependencies on clocks and reset in drivers 2019-02-14 11:20:23 +01:00