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

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Date:   Thu, 27 Aug 2020 08:04:21 -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 10:50 PM Vinod Koul <vkoul@...nel.org> wrote:
>
> On 26-08-20, 08:35, Rob Herring wrote:
> > 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?
>
> Sorry not sure I follow, to clarify you mean drop uint32, if so which
> type to use u8? I can use u8 as max wont be beyond 255.

maxItems applies to arrays. A uint32 is not an array, so drop 'maxItems'.

>
> Yes I will define min as well max values too.
>
> > Otherwise, up to 2^32 - 1 is valid.
>
> I see one more warning given by your bot which I am able to reproduce as
> well:
> Documentation/devicetree/bindings/dma/qcom,gpi.example.dt.yaml: example-0: dma-controller@...000:reg:0: [0, 8388608, 0, 393216] is too long
>
> So to fix this I added the #address-cells and #size-cells
>
>         #address-cells = <2>;
>         #size-cells = <2>;
>         reg = <0x0 0x00800000 0x0 0x60000>;
>
> But I am getting the warning, what am I doing incorrect

The cell sizes for reg come from the parent node. The default for
examples is 1 cell each. The easiest thing to do is change reg to
'<0x00800000 0x60000>'. Otherwise, you'd need to define a parent bus
node.

Rob