linux-kernel - Re: [PATCH 1/3] dt-bindings: iio: Add KX132 accelerometer

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Date:   Sun, 19 Mar 2023 15:54:51 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Mehdi Djait <mehdi.djait.k@...il.com>
Cc:     mazziesaccount@...il.com, krzysztof.kozlowski+dt@...aro.org,
        andriy.shevchenko@...ux.intel.com, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: iio: Add KX132 accelerometer

On Fri, 17 Mar 2023 00:48:35 +0100
Mehdi Djait <mehdi.djait.k@...il.com> wrote:

> Extend the kionix,kx022a.yaml file to support the
> kx132 device
> 
> Signed-off-by: Mehdi Djait <mehdi.djait.k@...il.com>

Pins and power supplies etc all look the same to me so indeed seems that
you have covered all that is needed.  One small comment inline
and I think Matti's point about more specific compatibles probably
needs to be taken into account if there are known variants.

Kionix has done this for a long time. I remember that fun with the
kxsd9 lots of years back - that had lots of subtle variants.

> ---
>  .../bindings/iio/accel/kionix,kx022a.yaml           | 13 ++++++++-----
>  1 file changed, 8 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/iio/accel/kionix,kx022a.yaml b/Documentation/devicetree/bindings/iio/accel/kionix,kx022a.yaml
> index 986df1a6ff0a..ac1e27402d5e 100644
> --- a/Documentation/devicetree/bindings/iio/accel/kionix,kx022a.yaml
> +++ b/Documentation/devicetree/bindings/iio/accel/kionix,kx022a.yaml
> @@ -4,19 +4,22 @@
>  $id: http://devicetree.org/schemas/iio/accel/kionix,kx022a.yaml#
>  $schema: http://devicetree.org/meta-schemas/core.yaml#
>  
> -title: ROHM/Kionix KX022A Accelerometer
> +title: ROHM/Kionix KX022A and KX132 Accelerometers
>  
>  maintainers:
>    - Matti Vaittinen <mazziesaccount@...il.com>
>  
>  description: |
> -  KX022A is a 3-axis accelerometer supporting +/- 2G, 4G, 8G and 16G ranges,
> -  output data-rates from 0.78Hz to 1600Hz and a hardware-fifo buffering.
> -  KX022A can be accessed either via I2C or SPI.
> +  KX022A and KX132 are 3-axis accelerometers supporting +/- 2G, 4G, 8G and
> +  16G ranges, output data-rates from 0.78Hz to 1600Hz and a hardware-fifo

This may be one of those 'there are many versions' of the chip issues, but
the random datasheet I got via digikey (kionix website was slow and I'm
impatient) has max as 25600Hz for the KX132-1211.

No particular reason the sampling rates need to be in this description so
if they are different I'd just remove the mention or just say
"variable output data-rates"

> +  buffering.
> +  KX022A and KX132 can be accessed either via I2C or SPI.
>  
>  properties:
>    compatible:
> -    const: kionix,kx022a
> +    enum:
> +      - kionix,kx022a
> +      - kionix,kx132
>  
>    reg:
>      maxItems: 1