On Wed, 16 May 2018, Fabrice Gasnier wrote: > 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.gasn...@st.com> > Reviewed-by: Benjamin Gaignard <benjamin.gaign...@linaro.org> > --- > Changes in v5: > - fix warning on dma_mapping_error() that doesn't return an error code. > - move stm32_timers_dma struct to header file as discussed with Lee. > This allows to remove alloc for this struct in stm32_timers_dma_probe. > > Changes in v4: > - Lee's comments: Add kerneldoc header, better format comments. > > Changes in v3: > - Basically Lee's comments: > - rather create a struct stm32_timers_dma, and place a reference to it > in existing ddata (instead of adding priv struct). > - rather use a struct device in exported routine prototype, and use > standard helpers instead of ddata. Get rid of to_stm32_timers_priv(). > - simplify error handling in probe (remove a goto) > - comment on devm_of_platform_*populate() usage. > > Changes in v2: > - Abstract DMA handling from child driver: move it to MFD core > - Add comments on optional dma support > --- > drivers/mfd/stm32-timers.c | 201 > ++++++++++++++++++++++++++++++++++++++- > include/linux/mfd/stm32-timers.h | 46 +++++++++ > 2 files changed, 245 insertions(+), 2 deletions(-)
For my own reference: Acked-for-MFD-by: Lee Jones <lee.jo...@linaro.org> -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog
