iio: Add STM32 timer trigger driver

Timers IPs can be used to generate triggers for other IPs like
DAC or ADC.
Each trigger may result of timer internals signals like counter enable,
reset or edge, this configuration could be done through "master_mode"
device attribute.

Since triggers could be used by DAC or ADC their names are defined
in include/ nux/iio/timer/stm32-timer-trigger.h and is_stm32_iio_timer_trigger
function could be used to check if the trigger is valid or not.

"trgo" trigger have a "sampling_frequency" attribute which allow to configure
timer sampling frequency.

version 8:
- change kernel version from 4.10 to 4.11 in ABI documentation

version 7:
- remove all iio_device related code
- move driver into trigger directory

version 5:
- simplify tables of triggers
- only create an IIO device when needed

version 4:
- get triggers configuration from "reg" in DT
- add tables of triggers
- sampling frequency is enable/disable when writing in trigger
  sampling_frequency attribute
- no more use of interruptions

version 3:
- change compatible to "st,stm32-timer-trigger"
- fix attributes access right
- use string instead of int for master_mode and slave_mode
- document device attributes in sysfs-bus-iio-timer-stm32

version 2:
- keep only one compatible
- use st,input-triggers-names and st,output-triggers-names
  to know which triggers are accepted and/or create by the device

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32 b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
new file mode 100644
index 0000000..6534a60
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-timer-stm32
@@ -0,0 +1,29 @@
+What:		/sys/bus/iio/devices/triggerX/master_mode_available
+KernelVersion:	4.11
+Contact:	benjamin.gaignard@st.com
+Description:
+		Reading returns the list possible master modes which are:
+		- "reset"     :	The UG bit from the TIMx_EGR register is used as trigger output (TRGO).
+		- "enable"    : The Counter Enable signal CNT_EN is used as trigger output.
+		- "update"    : The update event is selected as trigger output.
+				For instance a master timer can then be used as a prescaler for a slave timer.
+		- "compare_pulse" : The trigger output send a positive pulse when the CC1IF flag is to be set.
+		- "OC1REF"    : OC1REF signal is used as trigger output.
+		- "OC2REF"    : OC2REF signal is used as trigger output.
+		- "OC3REF"    : OC3REF signal is used as trigger output.
+		- "OC4REF"    : OC4REF signal is used as trigger output.
+
+What:		/sys/bus/iio/devices/triggerX/master_mode
+KernelVersion:	4.11
+Contact:	benjamin.gaignard@st.com
+Description:
+		Reading returns the current master modes.
+		Writing set the master mode
+
+What:		/sys/bus/iio/devices/triggerX/sampling_frequency
+KernelVersion:	4.11
+Contact:	benjamin.gaignard@st.com
+Description:
+		Reading returns the current sampling frequency.
+		Writing an value different of 0 set and start sampling.
+		Writing 0 stop sampling.