linux-kernel - Re: [PATCH v2 2/2] dt-bindings: iio: adc: Add DT docs for AD7292

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Date:   Tue, 22 Oct 2019 11:03:43 -0500
From:   Rob Herring <robh@...nel.org>
To:     Marcelo Schmitt <marcelo.schmitt1@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Dragos Bogdan <dragos.bogdan@...log.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@...r.kernel.org>,
        devicetree@...r.kernel.org, kernel-usp@...glegroups.com
Subject: Re: [PATCH v2 2/2] dt-bindings: iio: adc: Add DT docs for AD7292

On Tue, Oct 22, 2019 at 9:06 AM Marcelo Schmitt
<marcelo.schmitt1@...il.com> wrote:
>
> Hi,
>
> I ran the DTC and CHECK for AD7292 schema however, the target '__build'
> did not run due to errors found in regulator/fixed-regulator.yaml and
> arm/allwinner,sun4i-a10-csi.yaml.

Fixes for those are still pending in -next. Use 'make -k' and ignore those.

>
> I recall seeing something about the maxItems requirement over regulator
> supplies being changed on the iio mailing list, so I updated my repo
> locally, cloned and reinstalled the dt-schema toolset. However, I still
> can't make it go through the '__build' target.
>
> Python 3.7.5rc1 is my default python and I got the following pip3
> packages installed:
>
> ruamel.yaml        0.16.5
> ruamel.yaml.clib   0.2.0
> rfc3987            1.3.8
> jsonschema         3.0.1
> dtschema           0.0.1  at $HOME/<iio repo dir>/dt-schema
>
> Debian Bullseye packages installed:
> python3-yaml/testing,now 5.1.2-1
> libyaml-dev/testing,now 0.2.2-1
>
> I was only able to run DTC after installing the libyaml-dev package, so
> I think it might be worth to add it to the project dependencies at
> https://github.com/robherring/dt-schema.

Strictly speaking, it's not a dependency for dt-schema. It's
documented in Documentation/devicetree/writing-schema.rst. I've added
a pointer to that in bindings/submitting-patches.txt. I'm not sure how
else to make it more obvious.

BTW, You will get a useful error message if libyaml is missing when
building 'make dtbs_check'. I need to make that work for
dt_binding_check.

> apt-get install libyaml-dev

You need the lib too, but that tends to already be installed. IIRC,
installing the headers doesn't install the lib automatically.

In any case, I wanted to avoid putting in distro specific instructions
in the kernel.

Rob