linux-kernel - Re: [PATCH 02/16] dt-bindings: spi: Add bcmbca-hsspi controller support

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Date:   Wed, 11 Jan 2023 10:01:29 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     William Zhang <william.zhang@...adcom.com>,
        Linux SPI List <linux-spi@...r.kernel.org>,
        Broadcom Kernel List <bcm-kernel-feedback-list@...adcom.com>
Cc:     anand.gore@...adcom.com, tomer.yacoby@...adcom.com,
        dan.beygelman@...adcom.com, joel.peshkin@...adcom.com,
        f.fainelli@...il.com, jonas.gorski@...il.com,
        kursad.oney@...adcom.com, dregan@...l.com,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/16] dt-bindings: spi: Add bcmbca-hsspi controller
 support

On 11/01/2023 01:59, William Zhang wrote:
>>>> You need to add constraints for reg-names, same way as for reg.
>>>> Disallowing the reg-names also could work, but there won't be benefit in
>>>> it. Better to have uniform DTS.
>>>>
>>> I agree it is better to have the uniform DTS but the situation here is
>>> that the brcm,bcm6328-hsspi does not require reg name since there is
>>> only one register needed and it was already used in many chip dts for
>>> long time.  If I enforce it to have the corresponding reg name, that
>>
>> No one told you to enforce to have a reg-names.
>>
>>> could potentially break the compatibility of those old device if the
>>> driver change to use reg name, right?
>>
>> How compatibility is broken by some optional, unrelated property?
>>
> I think I misunderstand what you said.  You basically want the reg-name 
> minItem/maxItem constraints for brcm,bcm6328-hsspi compatible as well so 
> it is consistent for all the compatibles?

Yes.

Best regards,
Krzysztof