linux-kernel - Re: [PATCH v2 3/3] dt-bindings: iio: accel: adxl345: Add spi-3wire

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Message-ID: <60ed3d61-1ece-498f-97a2-7b1c618ceacb@linaro.org>
Date: Sat, 23 Mar 2024 15:27:05 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Lothar Rubusch <l.rubusch@...il.com>, Rob Herring <robh@...nel.org>
Cc: lars@...afoo.de, Michael.Hennerich@...log.com, jic23@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
 linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, eraretuya@...il.com
Subject: Re: [PATCH v2 3/3] dt-bindings: iio: accel: adxl345: Add spi-3wire

On 23/03/2024 13:04, Lothar Rubusch wrote:
> On Fri, Mar 22, 2024 at 3:17 AM Rob Herring <robh@...nel.org> wrote:
>>
>> On Fri, Mar 22, 2024 at 12:37:13AM +0000, Lothar Rubusch wrote:
>>> Provide the optional spi-3wire in the example.
>>
>> That doesn't match the diff as you don't touch the example. But really,
>> this should say why you need spi-3wire.
> 
> I understand. The change does not add anything to the example. which
> is definitely wrong.
> Anyway I'm unsure about this change in particular. I know the spi-3wire
> binding exists and can be implemented. Not all spi devices offer it. Not all
> drivers implement it. My patch set tries to implement spi-3wire for the
> particular accelerometer.
> Do I need to add something here to dt-bindings documentation of the
> adxl345? Or, as an optional spi feature, is it covered anyway by
> documentation of optional spi bindings? So, should I refrase this particular
> patch or may I drop it entirely? Could you please clarify.

Whether you need to change bindings or not, dtbs_check will tell you.
Just run dtbs_check on your DTS.

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check W=1` (see
Documentation/devicetree/bindings/writing-schema.rst or
https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
for instructions).

AFAIR, spi-3wire requires being explicitly mentioned in the device bindings.


Best regards,
Krzysztof