linux-kernel - Re: [Patch v7 3/4] dt-bindings: memory: Update reg/reg-names validation

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Date:   Sun, 24 Apr 2022 16:34:46 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Ashish Mhetre <amhetre@...dia.com>, Rob Herring <robh@...nel.org>
Cc:     dmitry.osipenko@...labora.com, digetx@...il.com,
        thierry.reding@...il.com, jonathanh@...dia.com,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, krzysztof.kozlowski+dt@...aro.org,
        vdumpa@...dia.com, Snikam@...dia.com
Subject: Re: [Patch v7 3/4] dt-bindings: memory: Update reg/reg-names
 validation

On 24/04/2022 07:20, Ashish Mhetre wrote:
>>>
>>> New, added properties cannot be required. That's an ABI break.
>>>
>> This is handled in driver code to make sure driver works with old dts
>> as well. So is this bindings change fine or shall I change it such that
>> dt bindings check shall pass with older dts as well?
>> Or as mentioned by Dmitry, I can update the commit message to reflect
>> that ABI change is intended and driver is compatible with older DTBs as
>> well.
>>
> Hi Rob,
> Can you please confirm how shall I go in next version?
> Is it fine for dt bindings check to fail if driver is compatible with
> old as well as new dts? Or dt bindings check shall pass with old as
> well as new dts?
The driver works fine without reg-names and accepts old DTB, right? In
such case, just mention this in commit msg, that the bindings require
reg-names but backwards compatibility will be preserved in the driver. I
think it's fine to alter bindings such way.

Best regards,
Krzysztof