linux-kernel - Re: [PATCH v3 6/8] dt-bindings: iio: adc: add bindings doc for AXI ADC driver

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Message-ID: <CAL_JsqJrzjKbKF3A1EGFVpP=KgeRY97yWf_k+T4t-nWZ3=n0zg@mail.gmail.com>
Date:   Wed, 4 Mar 2020 10:18:03 -0600
From:   Rob Herring <robh@...nel.org>
To:     "Ardelean, Alexandru" <alexandru.Ardelean@...log.com>
Cc:     "jic23@...nel.org" <jic23@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-iio@...r.kernel.org" <linux-iio@...r.kernel.org>
Subject: Re: [PATCH v3 6/8] dt-bindings: iio: adc: add bindings doc for AXI
 ADC driver

On Wed, Mar 4, 2020 at 1:55 AM Ardelean, Alexandru
<alexandru.Ardelean@...log.com> wrote:
>
> On Tue, 2020-03-03 at 10:53 -0600, Rob Herring wrote:
> > On Thu, Feb 27, 2020 at 10:27:17AM +0200, Alexandru Ardelean wrote:
> > > This change adds the bindings documentation for the AXI ADC driver.
> > >
> > > Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
> > > ---
> > >  .../bindings/iio/adc/adi-axi-adc.yaml         | 69 +++++++++++++++++++
> >
> > Follow the compatible string: adi,axi-adc.yaml
>
> ack
>
> >
> > >  1 file changed, 69 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/iio/adc/adi-axi-
> > > adc.yaml
> > >
> > > diff --git a/Documentation/devicetree/bindings/iio/adc/adi-axi-adc.yaml
> > > b/Documentation/devicetree/bindings/iio/adc/adi-axi-adc.yaml
> > > new file mode 100644
> > > index 000000000000..d45d41f4f08e
> > > --- /dev/null
> > > +++ b/Documentation/devicetree/bindings/iio/adc/adi-axi-adc.yaml
> > > @@ -0,0 +1,69 @@
> > > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > > +%YAML 1.2
> > > +---
> > > +$id: http://devicetree.org/schemas/iio/adc/adi-axi-adc.yaml#
> > > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > > +
> > > +title: Analog Devices AXI ADC IP core
> > > +
> > > +maintainers:
> > > +  - Michael Hennerich <michael.hennerich@...log.com>
> > > +  - Alexandru Ardelean <alexandru.ardelean@...log.com>
> > > +
> > > +description: |
> > > +  Analog Devices Generic AXI ADC IP core for interfacing an ADC device
> > > +  with a high speed serial (JESD204B/C) or source synchronous parallel
> > > +  interface (LVDS/CMOS).
> > > +  Usually, some other interface type (i.e SPI) is used as a control
> > > +  interface for the actual ADC, while this IP core will interface
> > > +  to the data-lines of the ADC and handle the streaming of data into
> > > +  memory via DMA.
> > > +
> > > +  https://wiki.analog.com/resources/fpga/docs/axi_adc_ip
> > > +
> > > +properties:
> > > +  compatible:
> > > +    enum:
> > > +      - adi,axi-adc-10.0.a
> > > +
> > > +  reg:
> > > +    maxItems: 1
> > > +
> > > +  dmas:
> > > +    minItems: 1
> > > +    maxItems: 1
> >
> > Just maxItems is enough.
>
> ack
>
> >
> > > +
> > > +  dma-names:
> > > +    maxItems: 1
> > > +    items:
> > > +      - const: rx
> > > +
> > > +  adi-axi-adc-client:
> >
> > adi,axi-adc-client
> >
> > Though I think 'adi,adc-dev' would be better name.
>
> works for me
> one question though; this still gives:
>
>   CHKDT   Documentation/devicetree/bindings/iio/adc/adi,axi-adc.yaml
> /home/sandu/work/linux/upstream/Documentation/devicetree/bindings/iio/adc/adi,ax
> i-adc.yaml: properties:adi,adc-dev: {'description': 'A reference to a the actual
> ADC to which this FPGA ADC interfaces to.', 'maxItems': 1} is not valid under
> any of the given schemas (Possible causes of the failure):
>         /home/sandu/work/linux/upstream/Documentation/devicetree/bindings/iio/ad
> c/adi,axi-adc.yaml: properties:adi,adc-dev: 'not' is a required property

Yes, not the most helpful errors I know. You need a type reference and
'maxItems' should be dropped.

$ref: /schemas/types.yaml#/definitions/phandle

Rob