linux-kernel - Re: [PATCH v3 1/1] arm64: dts: qcom: sm8550: remove address/size-cells from mdss

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Message-ID: <13b61d41-6045-499e-864b-51c6cb6eacf9@linaro.org>
Date: Tue, 19 Dec 2023 10:41:43 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: "Aiqun Yu (Maria)" <quic_aiquny@...cinc.com>,
 Tengfei Fan <quic_tengfan@...cinc.com>, andersson@...nel.org,
 konrad.dybcio@...aro.org, robh+dt@...nel.org,
 krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, kernel@...cinc.com
Subject: Re: [PATCH v3 1/1] arm64: dts: qcom: sm8550: remove
 address/size-cells from mdss_dsi1

On 19/12/2023 10:36, Aiqun Yu (Maria) wrote:
> 
> 
> On 12/19/2023 3:17 PM, Krzysztof Kozlowski wrote:
>> On 19/12/2023 01:31, Tengfei Fan wrote:
>>> The address/size-cells in mdss_dsi1 node have not ranges and child also
>>> have not reg, then this leads to dtc W=1 warnings:
>>
> Comments can be more readable:
> "mdss_dsi1" node don't have "ranges" or child "reg" property, while it 
> have address/size-cells properties. This caused 
> "avoid_unnecessary_addr_size" warning from dtb check.
> Remove address/size-cells properties for "mdss_dsi1" node.
> 
>> I cannot parse it. Address/size cells never have ranges or children.
>> They cannot have. These are uint32 properties.
> Pls help to comment on the revised commit message. Every time I write a 
> commit message, also takes a while for me to double confirm whether 
> others can understand me correctly as well. Feel free to let us know if 
> it is not readable to you. It will help us as non-English native developers.
>>
>>>
>>>    sm8550.dtsi:2937.27-2992.6: Warning (avoid_unnecessary_addr_size): /soc@...isplay-subsystem@...0000/dsi@...6000:
>>>      unnecessary #address-cells/#size-cells without "ranges" or child "reg" property
>>>
>>>
>>> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>> Signed-off-by: Tengfei Fan <quic_tengfan@...cinc.com>
>>> ---
>>
>> I disagreed with the patch before. You resubmit it without really
>> addressing my concerns.
>>
>> I am not sure if this is correct fix and I want to fix all of such
>> errors (there are multiple of them) in the same way. Feel free to
>> propose common solution based on arguments.
> Per my understanding, "qcom,mdss-dsi-ctrl" driver node like "mdss_dsi1" 
> don't need to have address/size-cells properties.

Just because dtc says so? And what about bindings?

> Feel free to let us know whether there is different idea of 
> "address/size-cells" needed for the "qcom,mdss-dsi-ctrl" driver node.

The bindings expressed that idea. If the binding is incorrect, fix the
binding and the DTS. If the binding is correct, provide rationale why it
somehow does not apply here etc.


Best regards,
Krzysztof