linux-kernel - Re: [PATCH v2 0/4] Introduce the Counter character device interface

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Message-ID: <ac473c9a-f9cd-21ae-8f8f-d5181df2c134@lechnology.com>
Date:   Tue, 2 Jun 2020 10:18:07 -0500
From:   David Lechner <david@...hnology.com>
To:     William Breathitt Gray <vilhelm.gray@...il.com>,
        Jonathan Cameron <jic23@...nel.org>
Cc:     kamel.bouhara@...tlin.com, gwendal@...omium.org,
        alexandre.belloni@...tlin.com, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, syednwaris@...il.com,
        patrick.havelange@...ensium.com, fabrice.gasnier@...com,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com
Subject: Re: [PATCH v2 0/4] Introduce the Counter character device interface

On 5/31/20 12:14 PM, William Breathitt Gray wrote:
> Yielding the following /dev/counter0 memory layout:
> 
> +------------+-----------------+------------+-------------------+
> | Byte 0     | Byte 1 - Byte 8 | Byte 9     | Byte 10 - Byte 17 |
> +------------+-----------------+------------+-------------------+
> | Boundary 0 | Count 0         | Boundary 1 | Count 1           |
> +------------+-----------------+------------+-------------------+

A potential pitfall with this sort of packing is that some platforms
do not support unaligned access, so data would have to be "unpacked"
before it could be used.