linux-kernel - Re: [PATCH v4 2/3] iio: accel: Support Kionix/ROHM KX022A accelerometer

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Message-ID: <3ad8b485-9007-f7e9-f52a-d5644a688bcf@wanadoo.fr>
Date:   Mon, 24 Oct 2022 15:34:02 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     mazziesaccount@...il.com
Cc:     DDRokosov@...rdevices.ru, andriy.shevchenko@...ux.intel.com,
        demonsingur@...il.com, devicetree@...r.kernel.org,
        jagathjog1996@...il.com, jic23@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, lars@...afoo.de,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        matti.vaittinen@...rohmeurope.com, nikita.yoush@...entembedded.com,
        robh+dt@...nel.org
Subject: Re: [PATCH v4 2/3] iio: accel: Support Kionix/ROHM KX022A
 accelerometer

Le 21/10/2022 à 13:22, Matti Vaittinen a écrit :
> KX022A is a 3-axis accelerometer from ROHM/Kionix. The sensor features
> include variable ODRs, I2C and SPI control, FIFO/LIFO with watermark IRQ,
> tap/motion detection, wake-up & back-to-sleep events, four acceleration
> ranges (2, 4, 8 and 16g), and probably some other cool features.
> 
> Add support for the basic accelerometer features such as getting the
> acceleration data via IIO. (raw reads, triggered buffer [data-ready] or
> using the WMI IRQ).
> 
> Important things to be added include the double-tap, motion
> detection and wake-up as well as the runtime power management.
> 
> Signed-off-by: Matti Vaittinen <mazziesaccount-Re5JQEeQqe8AvxtiuMwx3w@...lic.gmane.org>
> 
> ---

Hi, should there be a v5:

> +/*
> + * The KX022A has FIFO which can store 43 samples of HiRes data from 2

Nit: 2 here, but 3 the lines just before.

> + * channels. This equals to 43 (samples) * 3 (channels) * 2 (bytes/sample) to
> + * 258 bytes of sample data. The quirk to know is that the amount of bytes in
> + * the FIFO is advertised via 8 bit register (max value 255). The thing to note
> + * is that full 258 bytes of data is indicated using the max value 255.
> + */