kernel/Documentation/ABI/testing/sysfs-bus-iio-frequency-ad9523
.. .. @@ -8,7 +8,9 @@ 8 8 Contact: linux-iio@vger.kernel.org 9 9 Description: 10 10 Reading returns either '1' or '0'. 11 +11 12 '1' means that the clock in question is present. 13 +12 14 '0' means that the clock is missing. 13 15 14 16 What: /sys/bus/iio/devices/iio:deviceX/pllY_locked