linux-kernel - Re: [PATCH 09/15] dt-bindings: phy: qcom,qmp-pcie: mark current bindings as legacy

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Date:   Tue, 18 Oct 2022 11:32:07 -0400
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Johan Hovold <johan@...nel.org>
Cc:     Johan Hovold <johan+linaro@...nel.org>,
        Vinod Koul <vkoul@...nel.org>, Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/15] dt-bindings: phy: qcom,qmp-pcie: mark current
 bindings as legacy

On 18/10/2022 07:37, Dmitry Baryshkov wrote:
> 
>>> And yes, I think we should also upgrade
>>> older DTs, keeping drivers backwards compatible (for some time?).
>>
>> Possibly, but I'm not sure it's worth the dts churn. As I mentioned
>> elsewhere, supporting both the old and new binding in the driver is
>> mostly trivial, while encoding the deprecated bindings in DT schema
>> sounds like it would be painful.
> 
> This is probably the time where Krzysztof can advise us. I'm still not
> sure when it is expected to encode both old and new bindings in the
> schema and when we can update both the schema and the DT.

I do not follow what exactly the proposal is. Are you asking whether to:
1. keep existing DTS compatible with old driver?
or
2. update existing DTS so it is working only with new driver (and not
compatible with old driver thus having ABI break)?

If so, it is less question to bindings but more to the usage of DTS in
other projects (like bootloaders, firmware, BSD) and generic
recommendation is: do not break other users, if possible. It is however
up to the platform maintainer (Bjorn) to decide on this, not on me.

Best regards,
Krzysztof