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		- "reset"     :	The UG bit from the TIMx_EGR register is
  7				used as trigger output (TRGO).
  8		- "enable"    : The Counter Enable signal CNT_EN is used
  9				as trigger output.
 10		- "update"    : The update event is selected as trigger output.
 11				For instance a master timer can then be used
 12				as a prescaler for a slave timer.
 13		- "compare_pulse" : The trigger output send a positive pulse
 14				    when the CC1IF flag is to be set.
 15		- "OC1REF"    : OC1REF signal is used as trigger output.
 16		- "OC2REF"    : OC2REF signal is used as trigger output.
 17		- "OC3REF"    : OC3REF signal is used as trigger output.
 18		- "OC4REF"    : OC4REF signal is used as trigger output.
 19		Additional modes (on TRGO2 only):
 20		- "OC5REF"    : OC5REF signal is used as trigger output.
 21		- "OC6REF"    : OC6REF signal is used as trigger output.
 22		- "compare_pulse_OC4REF":
 23		  OC4REF rising or falling edges generate pulses.
 24		- "compare_pulse_OC6REF":
 25		  OC6REF rising or falling edges generate pulses.
 26		- "compare_pulse_OC4REF_r_or_OC6REF_r":
 27		  OC4REF or OC6REF rising edges generate pulses.
 28		- "compare_pulse_OC4REF_r_or_OC6REF_f":
 29		  OC4REF rising or OC6REF falling edges generate pulses.
 30		- "compare_pulse_OC5REF_r_or_OC6REF_r":
 31		  OC5REF or OC6REF rising edges generate pulses.
 32		- "compare_pulse_OC5REF_r_or_OC6REF_f":
 33		  OC5REF rising or OC6REF falling edges generate pulses.
 34
 35		+-----------+   +-------------+            +---------+
 36		| Prescaler +-> | Counter     |        +-> | Master  | TRGO(2)
 37		+-----------+   +--+--------+-+        |-> | Control +-->
 38		                   |        |          ||  +---------+
 39		                +--v--------+-+ OCxREF ||  +---------+
 40		                | Chx compare +----------> | Output  | ChX
 41		                +-----------+-+         |  | Control +-->
 42		                      .     |           |  +---------+
 43		                      .     |           |    .
 44		                +-----------v-+ OC6REF  |    .
 45		                | Ch6 compare +---------+>
 46		                +-------------+
 47
 48		Example with: "compare_pulse_OC4REF_r_or_OC6REF_r":
 49
 50		                X
 51		              X   X
 52		            X .   . X
 53		          X   .   .   X
 54		        X     .   .     X
 55		count X .     .   .     . X
 56		        .     .   .     .
 57		        .     .   .     .
 58		        +---------------+
 59		OC4REF  |     .   .     |
 60		      +-+     .   .     +-+
 61		        .     +---+     .
 62		OC6REF  .     |   |     .
 63		      +-------+   +-------+
 64		        +-+   +-+
 65		TRGO2   | |   | |
 66		      +-+ +---+ +---------+
 67
 68What:		/sys/bus/iio/devices/triggerX/master_mode
 69KernelVersion:	4.11
 70Contact:	benjamin.gaignard@st.com
 71Description:
 72		Reading returns the current master modes.
 73		Writing set the master mode
 74
 75What:		/sys/bus/iio/devices/triggerX/sampling_frequency
 76KernelVersion:	4.11
 77Contact:	benjamin.gaignard@st.com
 78Description:
 79		Reading returns the current sampling frequency.
 80		Writing an value different of 0 set and start sampling.
 81		Writing 0 stop sampling.
 82
 83What:		/sys/bus/iio/devices/iio:deviceX/in_count0_preset
 84KernelVersion:	4.12
 85Contact:	benjamin.gaignard@st.com
 86Description:
 87		Reading returns the current preset value.
 88		Writing sets the preset value.
 89		When counting up the counter starts from 0 and fires an
 90		event when reach preset value.
 91		When counting down the counter start from preset value
 92		and fire event when reach 0.
 93
 94What:		/sys/bus/iio/devices/iio:deviceX/in_count_quadrature_mode_available
 95KernelVersion:	4.12
 96Contact:	benjamin.gaignard@st.com
 97Description:
 98		Reading returns the list possible quadrature modes.
 99
100What:		/sys/bus/iio/devices/iio:deviceX/in_count0_quadrature_mode
101KernelVersion:	4.12
102Contact:	benjamin.gaignard@st.com
103Description:
104		Configure the device counter quadrature modes:
105		channel_A:
106			Encoder A input servers as the count input and B as
107			the UP/DOWN direction control input.
108
109		channel_B:
110			Encoder B input serves as the count input and A as
111			the UP/DOWN direction control input.
112
113		quadrature:
114			Encoder A and B inputs are mixed to get direction
115			and count with a scale of 0.25.
116
117What:		/sys/bus/iio/devices/iio:deviceX/in_count_enable_mode_available
118KernelVersion:	4.12
119Contact:	benjamin.gaignard@st.com
120Description:
121		Reading returns the list possible enable modes.
122
123What:		/sys/bus/iio/devices/iio:deviceX/in_count0_enable_mode
124KernelVersion:	4.12
125Contact:	benjamin.gaignard@st.com
126Description:
127		Configure the device counter enable modes, in all case
128		counting direction is set by in_count0_count_direction
129		attribute and the counter is clocked by the internal clock.
130		always:
131			Counter is always ON.
132
133		gated:
134			Counting is enabled when connected trigger signal
135			level is high else counting is disabled.
136
137		triggered:
138			Counting is enabled on rising edge of the connected
139			trigger, and remains enabled for the duration of this
140			selected mode.
141
142What:		/sys/bus/iio/devices/iio:deviceX/in_count_trigger_mode_available
143KernelVersion:	4.13
144Contact:	benjamin.gaignard@st.com
145Description:
146		Reading returns the list possible trigger modes.
147
148What:		/sys/bus/iio/devices/iio:deviceX/in_count0_trigger_mode
149KernelVersion:	4.13
150Contact:	benjamin.gaignard@st.com
151Description:
152		Configure the device counter trigger mode
153		counting direction is set by in_count0_count_direction
154		attribute and the counter is clocked by the connected trigger
155		rising edges.