linux-kernel - Re: [RFC 3/4] dt-bindings: iio: add support for GPIO triggers

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Date:   Thu, 23 Feb 2017 16:03:28 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Fabrice Gasnier <fabrice.gasnier@...com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Rob Herring <robh+dt@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre TORGUE <alexandre.torgue@...com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Hartmut Knaack <knaack.h@....de>,
        Peter Meerwald <pmeerw@...erw.net>,
        Benjamin Gaignard <benjamin.gaignard@...aro.org>,
        Benjamin Gaignard <benjamin.gaignard@...com>
Subject: Re: [RFC 3/4] dt-bindings: iio: add support for GPIO triggers

On Fri, Feb 17, 2017 at 5:03 PM, Fabrice Gasnier <fabrice.gasnier@...com> wrote:

> Document Industrial I/O GPIO trigger support.
>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
(...)
> +- gpio-trigger-rising-edge: A rising edge on GPIO will trigger.
> +- gpio-trigger-falling-edge: A falling edge on GPIO will trigger.
> +  Note: Both rising and falling edge may be used. In case none of
> +  rising or falling edge is selected, rising edge is selected by
> +  default.

We have GPIO_ACTIVE*_HIGH and GPIO_ACTIVE_LOW in the
gpios second cell already.

Can't we simply use that and specify that for this usecase, reading
that cell as GPIO_ACTIVE_HIGH == trigger on rising edge and
GPIO_ACTIVE_LOW == trigger on falling edge?

Yours,
Linus Walleij