linux-kernel - Re: [PATCH 1/3] dt-bindings: dmaengine: Document qcom,gpi dma binding

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Date:   Wed, 26 Aug 2020 08:35:29 -0600
From:   Rob Herring <robh@...nel.org>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:DMA GENERIC OFFLOAD ENGINE SUBSYSTEM" 
        <dmaengine@...r.kernel.org>
Subject: Re: [PATCH 1/3] dt-bindings: dmaengine: Document qcom,gpi dma binding

On Wed, Aug 26, 2020 at 12:32 AM Vinod Koul <vkoul@...nel.org> wrote:
>
> On 25-08-20, 20:21, Vinod Koul wrote:
> > Hey Rob,
> >
> > On 24-08-20, 11:40, Rob Herring wrote:
> > > On Mon, 24 Aug 2020 14:17:10 +0530, Vinod Koul wrote:
> > > > Add devicetree binding documentation for GPI DMA controller
> > > > implemented on Qualcomm SoCs
> > > >
> > > > Signed-off-by: Vinod Koul <vkoul@...nel.org>
> > > > ---
> > > >  .../devicetree/bindings/dma/qcom-gpi.yaml     | 87 +++++++++++++++++++
> > > >  1 file changed, 87 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/dma/qcom-gpi.yaml
> > > >
> > >
> > >
> > > My bot found errors running 'make dt_binding_check' on your patch:
> > >
> > > /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/dma/qcom-gpi.yaml: properties:qcom,ev-factor: {'description': 'Event ring transfer size compare to channel transfer ring. Event ring length = ev-factor * transfer ring size', 'maxItems': 1} is not valid under any of the given schemas (Possible causes of the failure):
> > >     /builds/robherring/linux-dt-review/Documentation/devicetree/bindings/dma/qcom-gpi.yaml: properties:qcom,ev-factor: 'not' is a required property
> >
> > Okay updating dt-schema I do see this, now the question is what is this
> > and what does it mean ;-) I am not sure I comprehend the error message.
> > I see this for all the new properties I added as required for this
> > device node
>
> Okay I think I have figured it out, I need to provide ref to
> /schemas/types.yaml#definitions/uint32 for this to work, which does
> makes sense to me.
>
>   qcom,max-num-gpii:
>     $ref: /schemas/types.yaml#definitions/uint32
>     maxItems: 1

uint32 is always 1 item, so drop. Is there a max value you can define?
Otherwise, up to 2^32 - 1 is valid.

>     description:
>       Number of GPII instances
>
> Looks good to schema tool
>
> --
> ~Vinod