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    iio: Add STM32 timer trigger driver · 93fbe91b
    Benjamin Gaignard authored
    
    
    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: default avatarBenjamin Gaignard <benjamin.gaignard@st.com>
    Acked-by: default avatarJonathan Cameron <jic23@kernel.org>
    Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
    93fbe91b