iio: adc: stm32: add trigger polarity extended attribute

[linux-2.6-microblaze.git] / Documentation / ABI / testing / sysfs-bus-iio-adc-stm32

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-adc-stm32
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+What:          /sys/bus/iio/devices/triggerX/trigger_polarity
+KernelVersion: 4.11
+Contact:       fabrice.gasnier@st.com
+Description:
+               The STM32 ADC can be configured to use external trigger sources
+               (e.g. timers, pwm or exti gpio). Then, it can be tuned to start
+               conversions on external trigger by either:
+               - "rising-edge"
+               - "falling-edge"
+               - "both-edges".
+               Reading returns current trigger polarity.
+               Writing value before enabling conversions sets trigger polarity.
+
+What:          /sys/bus/iio/devices/triggerX/trigger_polarity_available
+KernelVersion: 4.11
+Contact:       fabrice.gasnier@st.com
+Description:
+               List all available trigger_polarity settings.