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For non-DMA usage, we have an easy way to associate a timestamp with a sample: iio_pollfunc_store_time stores a timestamp in the primary trigger IRQ handler and stm32_adc_trigger_handler runs in the IRQ thread to push out the buffer along with the timestamp. For this to work, the driver needs to register an IIO_TIMESTAMP channel. Do this. For DMA, it's not as easy, because we don't push the buffers out of stm32_adc_trigger, but out of stm32_adc_dma_buffer_done, which runs in a tasklet scheduled after a DMA completion. Preferably, the DMA controller would copy us the timestamp into that buffer as well. Until this is implemented, restrict timestamping support to only PIO. For low-frequency sampling, PIO is probably good enough. Cc: Holger Assmann <has@pengutronix.de> Acked-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Link: https://lore.kernel.org/r/20210125194824.30549-1-a.fatoum@pengutronix.de Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> |
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.. | ||
accel | ||
adc | ||
afe | ||
amplifiers | ||
buffer | ||
chemical | ||
common | ||
dac | ||
dummy | ||
frequency | ||
gyro | ||
health | ||
humidity | ||
imu | ||
light | ||
magnetometer | ||
multiplexer | ||
orientation | ||
position | ||
potentiometer | ||
potentiostat | ||
pressure | ||
proximity | ||
resolver | ||
temperature | ||
trigger | ||
iio_core.h | ||
iio_core_trigger.h | ||
industrialio-buffer.c | ||
industrialio-configfs.c | ||
industrialio-core.c | ||
industrialio-event.c | ||
industrialio-sw-device.c | ||
industrialio-sw-trigger.c | ||
industrialio-trigger.c | ||
industrialio-triggered-event.c | ||
inkern.c | ||
Kconfig | ||
Makefile | ||
TODO |