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/triggerX/sampling_frequency
94KernelVersion:	4.11
95Contact:	benjamin.gaignard@st.com
96Description:
97		Reading returns the current sampling frequency.
98		Writing an value different of 0 set and start sampling.
99		Writing 0 stop sampling.
100
101What:		/sys/bus/iio/devices/iio:deviceX/in_count0_preset
102KernelVersion:	4.12
103Contact:	benjamin.gaignard@st.com
104Description:
105		Reading returns the current preset value.
106		Writing sets the preset value.
107		When counting up the counter starts from 0 and fires an
108		event when reach preset value.
109		When counting down the counter start from preset value
110		and fire event when reach 0.
111
112What:		/sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available
113KernelVersion:	4.12
114Contact:	benjamin.gaignard@st.com
115Description:
116		Reading returns the list possible quadrature modes.
117
118What:		/sys/bus/iio/devices/iio:deviceX/in_count0_quadrature_mode
119KernelVersion:	4.12
120Contact:	benjamin.gaignard@st.com
121Description:
122		Configure the device counter quadrature modes:
123
124		channel_A:
125			Encoder A input servers as the count input and B as
126			the UP/DOWN direction control input.
127
128		channel_B:
129			Encoder B input serves as the count input and A as
130			the UP/DOWN direction control input.
131
132		quadrature:
133			Encoder A and B inputs are mixed to get direction
134			and count with a scale of 0.25.
135
136What:		/sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available
137KernelVersion:	4.12
138Contact:	benjamin.gaignard@st.com
139Description:
140		Reading returns the list possible enable modes.
141
142What:		/sys/bus/iio/devices/iio:deviceX/in_count0_enable_mode
143KernelVersion:	4.12
144Contact:	benjamin.gaignard@st.com
145Description:
146		Configure the device counter enable modes, in all case
147		counting direction is set by in_count0_count_direction
148		attribute and the counter is clocked by the internal clock.
149
150		always:
151			Counter is always ON.
152
153		gated:
154			Counting is enabled when connected trigger signal
155			level is high else counting is disabled.
156
157		triggered:
158			Counting is enabled on rising edge of the connected
159			trigger, and remains enabled for the duration of this
160			selected mode.
161
162What:		/sys/bus/iio/devices/iio:deviceX/in_count_trigger_mode_available
163KernelVersion:	4.13
164Contact:	benjamin.gaignard@st.com
165Description:
166		Reading returns the list possible trigger modes.
167
168What:		/sys/bus/iio/devices/iio:deviceX/in_count0_trigger_mode
169KernelVersion:	4.13
170Contact:	benjamin.gaignard@st.com
171Description:
172		Configure the device counter trigger mode
173		counting direction is set by in_count0_count_direction
174		attribute and the counter is clocked by the connected trigger
175		rising edges.
176