On Fri, 30 Mar 2018, Fabrice Gasnier wrote: > Add support for PMW input mode on pwm-stm32. STM32 timers support > period and duty cycle capture as long as they have at least two PWM > channels. One capture channel is used for period (rising-edge), one > for duty-cycle (falling-edge). > When there's only one channel available, only period can be captured. > Duty-cycle is simply zero'ed in such a case. > > Capture requires exclusive access (e.g. no pwm output running at the > same time, to protect common prescaler). > Timer DMA burst mode (from MFD core) is being used, to take two > snapshots of capture registers (upon each period rising edge). > > Signed-off-by: Fabrice Gasnier <fabrice.gasnier@xxxxxx> > Reviewed-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx> > Acked-by: Thierry Reding <thierry.reding@xxxxxxxxx> > --- > Changes in v3: > - update stm32_timers_dma_burst_read() call: don't pass ddata structure, > use MFD parent device structure instead since MFD core update. > > Changes in v2: > - DMA handling has been moved to MFD core. Rework capture routines to > use it. > --- > drivers/pwm/pwm-stm32.c | 176 +++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/stm32-timers.h | 11 +++ For my own reference: Acked-for-MFD-by: Lee Jones <lee.jones@xxxxxxxxxx> > 2 files changed, 187 insertions(+) -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
