linux-kernel - Re: [PATCH 1/3] dt-bindings: net: qcom,ethqos: revise description for qcs615

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Message-ID: <20241119174156.GA1862978-robh@kernel.org>
Date: Tue, 19 Nov 2024 11:41:56 -0600
From: Rob Herring <robh@...nel.org>
To: Yijie Yang <quic_yijiyang@...cinc.com>
Cc: Vinod Koul <vkoul@...nel.org>, Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bhupesh Sharma <bhupesh.sharma@...aro.org>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	Jose Abreu <joabreu@...opsys.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, quic_tingweiz@...cinc.com,
	quic_aiquny@...cinc.com, quic_tengfan@...cinc.com,
	quic_jiegan@...cinc.com, quic_jingyw@...cinc.com,
	quic_jsuraj@...cinc.com
Subject: Re: [PATCH 1/3] dt-bindings: net: qcom,ethqos: revise description
 for qcs615

On Mon, Nov 18, 2024 at 02:16:50PM +0800, Yijie Yang wrote:
> The core version of EMAC on qcs615 has minor differences compared to that
> on sm8150. During the bring-up routine, the loopback bit needs to be set,
> and the Power-On Reset (POR) status of the registers isn't entirely
> consistent with sm8150 either.
> Therefore, it should be treated as a separate entity rather than a
> fallback option.

'revise description' is not very specific. 'Drop fallback compatible for 
qcom,qcs615-ethqos' would be better.

However, this is an ABI change. You could leave the binding/dts alone 
and only change the kernel driver to match on qcom,qcs615-ethqos to 
achieve what you need. If there's a reason why the ABI change is okay, 
then you need to detail that. Did the driver never work? Are there no 
users yet?

> 
> Fixes: 32535b9410b8 ("dt-bindings: net: qcom,ethqos: add description for qcs615")
> Signed-off-by: Yijie Yang <quic_yijiyang@...cinc.com>
> ---
>  Documentation/devicetree/bindings/net/qcom,ethqos.yaml | 5 +----
>  1 file changed, 1 insertion(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/qcom,ethqos.yaml b/Documentation/devicetree/bindings/net/qcom,ethqos.yaml
> index 0bcd593a7bd093d4475908d82585c36dd6b3a284..576a52742ff45d4984388bbc0fcc91fa91bab677 100644
> --- a/Documentation/devicetree/bindings/net/qcom,ethqos.yaml
> +++ b/Documentation/devicetree/bindings/net/qcom,ethqos.yaml
> @@ -23,12 +23,9 @@ properties:
>            - enum:
>                - qcom,qcs8300-ethqos
>            - const: qcom,sa8775p-ethqos
> -      - items:
> -          - enum:
> -              - qcom,qcs615-ethqos
> -          - const: qcom,sm8150-ethqos
>        - enum:
>            - qcom,qcs404-ethqos
> +          - qcom,qcs615-ethqos
>            - qcom,sa8775p-ethqos
>            - qcom,sc8280xp-ethqos
>            - qcom,sm8150-ethqos
> 
> -- 
> 2.34.1
>