Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) What:		/sys/bus/iio/devices/iio:deviceX/in_altvoltageY_invert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) Date:		October 2016
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) KernelVersion:	4.9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) Contact:	Peter Rosin <peda@axentia.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) 		The DAC is used to find the peak level of an alternating
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) 		voltage input signal by a binary search using the output
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) 		of a comparator wired to an interrupt pin. Like so::
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) 		                           _
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 		                          | \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) 		     input +------>-------|+ \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 		                          |   \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) 		            .-------.     |    }---.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) 		            |       |     |   /    |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 		            |    dac|-->--|- /     |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 		            |       |     |_/      |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 		            |       |              |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 		            |       |              |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 		            |    irq|------<-------'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 		            |       |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 		            '-------'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		The boolean invert attribute (0/1) should be set when the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 		input signal is centered around the maximum value of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 		dac instead of zero. The envelope detector will search
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 		from below in this case and will also invert the result.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 		The edge/level of the interrupt is also switched to its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 		opposite value.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) What:		/sys/bus/iio/devices/iio:deviceX/in_altvoltageY_compare_interval
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) Date:		October 2016
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) KernelVersion:	4.9
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) Contact:	Peter Rosin <peda@axentia.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) Description:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		Number of milliseconds to wait for the comparator in each
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		step of the binary search for the input peak level. Needs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		to relate to the frequency of the input signal.