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

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Message-ID: <46087486-bacd-c408-7ead-5b120412412b@linaro.org>
Date:   Tue, 13 Sep 2022 00:23:42 +0530
From:   Bhupesh Sharma <bhupesh.sharma@...aro.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        devicetree@...r.kernel.org
Cc:     linux-arm-msm@...r.kernel.org, agross@...nel.org,
        bhupesh.linux@...il.com, linux-kernel@...r.kernel.org,
        robh+dt@...nel.org, netdev@...r.kernel.org,
        Bjorn Andersson <andersson@...nel.org>,
        Rob Herring <robh@...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 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.

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

Thanks.