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From: Benjamin Gaignard <benjamin.gaignard@linaro.org>
To: Lars-Peter Clausen <lars@metafoo.de>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Jonathan Cameron <jic23@kernel.org>,
	linux-iio@vger.kernel.org, Hartmut Knaack <knaack.h@gmx.de>,
	Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
	Fabrice Gasnier <fabrice.gasnier@st.com>,
	Linaro Kernel Mailman List <linaro-kernel@lists.linaro.org>,
	Benjamin Gaignard <benjamin.gaignard@st.com>
Subject: Re: [PATCH v1 0/2] iio: Add parent_trigger attribute to triggers
Date: Mon, 6 Feb 2017 15:43:27 +0100	[thread overview]
Message-ID: <CA+M3ks5DzaXwmnnoin9kVUtV+sX5wXiiDz54=c541Huggi4a-Q@mail.gmail.com> (raw)
In-Reply-To: <ea85bd0e-90c5-ca08-172f-91d48e35f369@metafoo.de>

2017-02-06 15:26 GMT+01:00 Lars-Peter Clausen <lars@metafoo.de>:
> 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.

  reply	other threads:[~2017-02-06 14:43 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-06 14:21 [PATCH v1 0/2] iio: Add parent_trigger attribute to triggers Benjamin Gaignard
2017-02-06 14:21 ` [PATCH v1 1/2] iio: Allow triggers to be used as parent of others triggers Benjamin Gaignard
2017-02-11 10:54   ` Jonathan Cameron
2017-02-06 14:21 ` [PATCH v1 2/2] iio: stm32 trigger: Implement validate_trigger function Benjamin Gaignard
2017-02-11 11:14   ` Jonathan Cameron
2017-02-06 14:26 ` [PATCH v1 0/2] iio: Add parent_trigger attribute to triggers Lars-Peter Clausen
2017-02-06 14:43   ` Benjamin Gaignard [this message]
2017-02-11 10:23     ` Jonathan Cameron

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