linux-kernel - Re: [PATCH v7 1/4] dt-bindings: pwm: Add OpenCores PWM module

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Date:   Wed, 22 Nov 2023 15:03:36 +0800
From:   William Qiu <william.qiu@...rfivetech.com>
To:     Conor Dooley <conor@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-pwm@...r.kernel.org>,
        "Emil Renner Berthing" <kernel@...il.dk>,
        Rob Herring <robh+dt@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Krzysztof Kozlowski" <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
        Hal Feng <hal.feng@...rfivetech.com>,
        "Paul Walmsley" <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>
Subject: Re: [PATCH v7 1/4] dt-bindings: pwm: Add OpenCores PWM module



On 2023/11/14 4:17, Conor Dooley wrote:
> On Mon, Nov 13, 2023 at 09:07:15PM +0100, Krzysztof Kozlowski wrote:
>> On 13/11/2023 10:42, William Qiu wrote:
>> > Will update.
>> >>> +
>> >>> +allOf:
>> >>> +  - $ref: pwm.yaml#
>> >>> +
>> >>> +properties:
>> >>> +  compatible:
>> >>> +    oneOf:
>> >>> +      - items:
>> >>> +          - enum:
>> >>> +              - starfive,jh7100-pwm
>> >>> +              - starfive,jh7110-pwm
>> >>> +          - const: opencores,pwm
>> >>
>> >> That's a very, very generic compatible. Are you sure, 100% sure, that
>> >> all designs from OpenCores from now till next 100 years will be 100%
>> >> compatible?
>> >>
>> > My description is not accurate enough, this is OpenCores PTC IP, and PWM
>> > is one of those modes, so it might be better to replace compatible with
>> > "opencores, ptc-pwm"
>> > 
>> > What do you think?
>> 
>> Sorry, maybe this answers maybe doesn't. What is "PTC"?
> 
> "pwm timer counter". AFAIU, the IP can be configured to provide all 3.
> I think that William pointed out on an earlier revision that they have
> only implemented the pwm on their hardware.
> I don't think putting in "ptc" is a sufficient differentiator though, as
> clearly there could be several different versions of "ptc-pwm" that have
> the same concern about "all designs from OpenCores for now till the next
> 100 years" being compatible.
> 
> Cheers.
> Conor.

Hi，Conor and Krzysztof,

After discussion and review of materials, we plan to use "opencores,ptc-pwm-v1"
as this version of compatible, so that it can also be compatible in the future.

What do you think?


Best regards,
William