linux-kernel - Re: [PATCH v3 2/2] drivers: watchdog: Add StarFive Watchdog driver

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Date:   Tue, 28 Feb 2023 07:10:50 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Xingyu Wu <xingyu.wu@...rfivetech.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Emil Renner Berthing <emil.renner.berthing@...onical.com>
Cc:     linux-riscv@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-watchdog@...r.kernel.org,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Samin Guo <samin.guo@...rfivetech.com>,
        linux-kernel@...r.kernel.org, Conor Dooley <conor@...nel.org>
Subject: Re: [PATCH v3 2/2] drivers: watchdog: Add StarFive Watchdog driver

On 2/28/23 05:16, Xingyu Wu wrote:
> On 2023/2/28 19:11, Conor Dooley wrote:
>> On Tue, Feb 28, 2023 at 11:57:58AM +0100, Krzysztof Kozlowski wrote:
>>> On 28/02/2023 11:51, Conor Dooley wrote:
>>>> On Tue, Feb 28, 2023 at 11:36:49AM +0100, Emil Renner Berthing wrote:
>>>>> On Tue, 28 Feb 2023 at 10:44, Xingyu Wu <xingyu.wu@...rfivetech.com> wrote:
>>>>>> On 2023/2/26 22:14, Emil Renner Berthing wrote:
>>>>>>> On Mon, 20 Feb 2023 at 09:21, Xingyu Wu <xingyu.wu@...rfivetech.com> wrote:
>>>>
>>>>>> So the dt-bingdings need to rename, and which one could be better,
>>>>>> 'starfive,jh71x0-wdt.yaml' or 'starfive,jh-wdt.yaml'?
>>>>>
>>>>> Sure, starfive,jh71x0-wdt.yaml sounds good to me.
>>>>
>>>> I feel like a common comment I see from the dt folks is to not put
>>>> wildcards in filenames & just pick the first compatible.
>>>> I could very well be wrong on that front though...
>>>
>>> First compatible is a bit better, unless you are sure this will cover
>>> all such compatibles now and in the future. For many bindings the
>>> family/wildcards were fine in filename.
>>
>> Ahh cool, good to know what the specific policy is - thanks!
> 
> If this watchdog driver is improved to also support JH7100 in next patch,
> it seems more reasonable to rename the dt-bingdings to 'starfive,jh71x0-wdt.yaml'.


Up to the devicetree maintainers to decide, but I for my part never accept
wildcards in file names. You can not guarantee that all of jh71[0-9]0 will
be supported by this set of bindings. On top of that, when / if you add
support for anything outside that range (say, jh7200 or jh8100 or jh7101
or whatever) you'd have an even worse problem. Are you then going to suggest
renaming the file to jhxxxx-wdt ? Or one digit at a time ?

Guenter