1What:		/sys/bus/iio/devices/triggerX/master_mode_available
  2KernelVersion:	4.11
  3Contact:	benjamin.gaignard@st.com
  4Description:
  5		Reading returns the list possible master modes which are:
  6
  7
  8		- "reset"
  9				The UG bit from the TIMx_EGR register is
 10				used as trigger output (TRGO).
 11		- "enable"
 12				The Counter Enable signal CNT_EN is used
 13				as trigger output.
 14		- "update"
 15				The update event is selected as trigger output.
 16				For instance a master timer can then be used
 17				as a prescaler for a slave timer.
 18		- "compare_pulse"
 19				The trigger output send a positive pulse
 20				when the CC1IF flag is to be set.
 21		- "OC1REF"
 22				OC1REF signal is used as trigger output.
 23		- "OC2REF"
 24				OC2REF signal is used as trigger output.
 25		- "OC3REF"
 26				OC3REF signal is used as trigger output.
 27		- "OC4REF"
 28				OC4REF signal is used as trigger output.
 29
 30		Additional modes (on TRGO2 only):
 31
 32		- "OC5REF"
 33				OC5REF signal is used as trigger output.
 34		- "OC6REF"
 35				OC6REF signal is used as trigger output.
 36		- "compare_pulse_OC4REF":
 37				OC4REF rising or falling edges generate pulses.
 38		- "compare_pulse_OC6REF":
 39				OC6REF rising or falling edges generate pulses.
 40		- "compare_pulse_OC4REF_r_or_OC6REF_r":
 41				OC4REF or OC6REF rising edges generate pulses.
 42		- "compare_pulse_OC4REF_r_or_OC6REF_f":
 43				OC4REF rising or OC6REF falling edges generate
 44				pulses.
 45		- "compare_pulse_OC5REF_r_or_OC6REF_r":
 46				OC5REF or OC6REF rising edges generate pulses.
 47		- "compare_pulse_OC5REF_r_or_OC6REF_f":
 48				OC5REF rising or OC6REF falling edges generate
 49				pulses.
 50
 51		::
 52
 53		  +-----------+   +-------------+            +---------+
 54		  | Prescaler +-> | Counter     |        +-> | Master  | TRGO(2)
 55		  +-----------+   +--+--------+-+        |-> | Control +-->
 56		                     |        |          ||  +---------+
 57		                  +--v--------+-+ OCxREF ||  +---------+
 58		                  | Chx compare +----------> | Output  | ChX
 59		                  +-----------+-+         |  | Control +-->
 60		                        .     |           |  +---------+
 61		                        .     |           |    .
 62		                  +-----------v-+ OC6REF  |    .
 63		                  | Ch6 compare +---------+>
 64		                  +-------------+
 65
 66		Example with: "compare_pulse_OC4REF_r_or_OC6REF_r"::
 67
 68		                  X
 69		                X   X
 70		              X .   . X
 71		            X   .   .   X
 72		          X     .   .     X
 73		  count X .     .   .     . X
 74		          .     .   .     .
 75		          .     .   .     .
 76		          +---------------+
 77		  OC4REF  |     .   .     |
 78		        +-+     .   .     +-+
 79		          .     +---+     .
 80		  OC6REF  .     |   |     .
 81		        +-------+   +-------+
 82		          +-+   +-+
 83		  TRGO2   | |   | |
 84		        +-+ +---+ +---------+
 85
 86What:		/sys/bus/iio/devices/triggerX/master_mode
 87KernelVersion:	4.11
 88Contact:	benjamin.gaignard@st.com
 89Description:
 90		Reading returns the current master modes.
 91		Writing set the master mode
 92
 93What:		/sys/bus/iio/devices/iio:deviceX/in_count0_preset
 94KernelVersion:	4.12
 95Contact:	benjamin.gaignard@st.com
 96Description:
 97		Reading returns the current preset value.
 98		Writing sets the preset value.
 99		When counting up the counter starts from 0 and fires an
100		event when reach preset value.
101		When counting down the counter start from preset value
102		and fire event when reach 0.
103
104What:		/sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available
105KernelVersion:	4.12
106Contact:	benjamin.gaignard@st.com
107Description:
108		Reading returns the list possible enable modes.
109
110What:		/sys/bus/iio/devices/iio:deviceX/in_count0_enable_mode
111KernelVersion:	4.12
112Contact:	benjamin.gaignard@st.com
113Description:
114		Configure the device counter enable modes, in all case
115		counting direction is set by in_count0_count_direction
116		attribute and the counter is clocked by the internal clock.
117
118		always:
119			Counter is always ON.
120
121		gated:
122			Counting is enabled when connected trigger signal
123			level is high else counting is disabled.
124
125		triggered:
126			Counting is enabled on rising edge of the connected
127			trigger, and remains enabled for the duration of this
128			selected mode.
129
130What:		/sys/bus/iio/devices/iio:deviceX/in_count_trigger_mode_available
131KernelVersion:	4.13
132Contact:	benjamin.gaignard@st.com
133Description:
134		Reading returns the list possible trigger modes.
135
136What:		/sys/bus/iio/devices/iio:deviceX/in_count0_trigger_mode
137KernelVersion:	4.13
138Contact:	benjamin.gaignard@st.com
139Description:
140		Configure the device counter trigger mode
141		counting direction is set by in_count0_count_direction
142		attribute and the counter is clocked by the connected trigger
143		rising edges.