Re: [PATCH v1 0/2] iio: Add parent_trigger attribute to triggers

[Benjamin Gaignard]

2017-02-06 15:26 GMT+01:00 Lars-Peter Clausen <lars@xxxxxxxxxx>:
> On 02/06/2017 03:21 PM, Benjamin Gaignard wrote:
>> Thoses patches add parent_trigger attribute to IIO triggers.
>> The goal is to allow triggers to use triggers like is this done for iio
>> devices.
>> With this patch it will be possible to chain triggers, for example
>> stm32 triggers could be used as clock of an other triggers:
>> echo "tim1_trgo" > trigger0/parent_trigger.
>
> Can you explain how this is different to assigning the parent_trigger
> directly to the device?
>

It is the same but done on trigger structure without need to have an iio device.

While writing stm32 trigger driver Jonathan explain me that I can't use an iio
device without channel to chain my hardware blocks.
Since my hardware allows to chain triggers, Jonathan suggest to create this
parent_trigger attribute to ab able to link the triggers.