linux-kernel - Re: [PATCH v4 0/2] add support for GPIO based counter

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Message-ID: <20210127064457.qyal6jli5qj52ovx@pengutronix.de>
Date:   Wed, 27 Jan 2021 07:44:57 +0100
From:   Oleksij Rempel <o.rempel@...gutronix.de>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     Rob Herring <robh+dt@...nel.org>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        Robin van der Gracht <robin@...tonic.nl>,
        linux-kernel@...r.kernel.org,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        David Jander <david@...tonic.nl>
Subject: Re: [PATCH v4 0/2] add support for GPIO based counter

On Tue, Jan 26, 2021 at 02:18:34PM +0100, Marc Kleine-Budde wrote:
> On 1/26/21 2:12 PM, Oleksij Rempel wrote:
> > changes v4:
> > - use IRQ_NOAUTOEN to not enable IRQ by default
> > - rename gpio_ from name pattern and make this driver work any IRQ
> >   source.
> > 
> > changes v3:
> > - convert counter to atomic_t
> 
> What's the guaranteed width of atomic_t? IIRC a long time ago it was 24 bit only....

32 bits. The counter is wrapped after 4294967295

Regards,
Oleksij
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