mfd: stm32-timers: Add support for DMAs

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STM32 Timers can support up to 7 DMA requests:
- 4 channels, update, compare and trigger.
Optionally request part, or all DMAs from stm32-timers MFD core.

Also add routine to implement burst reads using DMA from timer registers.
This is exported. So, it can be used by child drivers, PWM capture
for instance (but not limited to).

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

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Fabrice Gasnier 2018-05-16 09:35:57 +02:00 • committed by Lee Jones

parent 60cc43fc88

commit 0c6609805b

2 changed files with 245 additions and 2 deletions

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201

drivers/mfd/stm32-timers.c

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46

include/linux/mfd/stm32-timers.h

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