linux-kernel - Re: [PATCH 3/4] dt-bindings: net: snps,dwmac: Update reg maxitems

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Date:   Mon, 12 Sep 2022 16:14:47 -0500
From:   Rob Herring <robh@...nel.org>
To:     Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        agross@...nel.org, bhupesh.linux@...il.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        Bjorn Andersson <andersson@...nel.org>,
        Vinod Koul <vkoul@...nel.org>,
        David Miller <davem@...emloft.net>
Subject: Re: [PATCH 3/4] dt-bindings: net: snps,dwmac: Update reg maxitems

On Tue, Sep 13, 2022 at 12:23:42AM +0530, Bhupesh Sharma wrote:
> On 9/8/22 8:11 PM, Krzysztof Kozlowski wrote:
> > On 07/09/2022 22:49, Bhupesh Sharma wrote:
> > > Since the Qualcomm dwmac based ETHQOS ethernet block
> > > supports 64-bit register addresses, update the
> > > reg maxitems inside snps,dwmac YAML bindings.
> > 
> > Please wrap commit message according to Linux coding style / submission
> > process:
> > https://elixir.bootlin.com/linux/v5.18-rc4/source/Documentation/process/submitting-patches.rst#L586
> > 
> > > 
> > > Cc: Bjorn Andersson <andersson@...nel.org>
> > > Cc: Rob Herring <robh@...nel.org>
> > > Cc: Vinod Koul <vkoul@...nel.org>
> > > Cc: David Miller <davem@...emloft.net>
> > > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> > > ---
> > >   Documentation/devicetree/bindings/net/snps,dwmac.yaml | 2 +-
> > >   1 file changed, 1 insertion(+), 1 deletion(-)
> > > 
> > > diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > > index 2b6023ce3ac1..f89ca308d55f 100644
> > > --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > > +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> > > @@ -94,7 +94,7 @@ properties:
> > >     reg:
> > >       minItems: 1
> > > -    maxItems: 2
> > > +    maxItems: 4
> > 
> > Qualcomm ETHQOS schema allows only 2 in reg-names, so this does not make
> > sense for Qualcomm and there are no users of 4 items.
> 
> On this platform the two reg spaces are 64-bit, whereas for other
> platforms based on dwmmac, for e.g. stm32 have 32-bit address space.

The schema for reg is how many addr/size entries regardless of cell 
sizes.

> Without this fix I was getting the following error with 'make dtbs_check':
> 
> Documentation/devicetree/bindings/net/qcom,ethqos.example.dtb:
> ethernet@...00: reg: [[0, 131072], [0, 65536], [0, 221184], [0, 256]] is too
> long
> 	From schema: /home/bhsharma/code/upstream/linux-bckup/linux/Documentation/devicetree/bindings/net/snps,dwmac.yaml

The default cell sizes for examples is 1 for addr/size. If you want it 
to be 2, you have to write your own parent node. But why? It's just an 
example. Use 1 cell like the example originally had.

Rob