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

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Message-ID: <ZBmvqytRamzmf908@carbian>
Date:   Tue, 21 Mar 2023 14:22:51 +0100
From:   Mehdi Djait <mehdi.djait.k@...il.com>
To:     Jonathan Cameron <jic23@...nel.org>
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

Hello Jonathan,

On Sun, Mar 19, 2023 at 03:54:51PM +0000, Jonathan Cameron wrote:
> 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"

Yes indeed, the max frequency is different and the max frequency
supported in the driver is 200Hz anyway.

Removing the values of samling rates is best here. I will change it in v2.

--
Kind Regards
Mehdi Djait