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Message-ID: <b0247572-607d-48e9-92ef-a3e0a8fe17f9@linaro.org>
Date:   Fri, 20 Oct 2023 20:04:21 +0200
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Subject: Re: [PATCH v6 1/4] dt-bindings: pwm: Add OpenCores PWM module
Content-Language: en-US
To:     Conor Dooley <conor@kernel.org>,
        William Qiu <william.qiu@starfivetech.com>
Cc:     devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-riscv@lists.infradead.org, linux-pwm@vger.kernel.org,
        Emil Renner Berthing <kernel@esmil.dk>,
        Rob Herring <robh+dt@kernel.org>,
        Thierry Reding <thierry.reding@gmail.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        =?UTF-8?Q?Uwe_Kleine-K=C3=B6nig?= <u.kleine-koenig@pengutronix.de>,
        Hal Feng <hal.feng@starfivetech.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>
References: <20231020103741.557735-1-william.qiu@starfivetech.com>
 <20231020103741.557735-2-william.qiu@starfivetech.com>
 <20231020-barley-rosy-92c3688cd515@spud>
 <20231020-giddy-fidgety-f070ef121ff2@spud>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Autocrypt: addr=krzysztof.kozlowski@linaro.org; keydata=
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In-Reply-To: <20231020-giddy-fidgety-f070ef121ff2@spud>
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Precedence: bulk

On 20/10/2023 16:22, Conor Dooley wrote:
> On Fri, Oct 20, 2023 at 03:21:15PM +0100, Conor Dooley wrote:
>> Krzysztof, William,
>>
>> On Fri, Oct 20, 2023 at 06:37:38PM +0800, William Qiu wrote:
>>> Add documentation to describe OpenCores Pulse Width Modulation
>>> controller driver.
>>>
>>> Signed-off-by: William Qiu <william.qiu@starfivetech.com>
>>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>> Reviewed-by: Hal Feng <hal.feng@starfivetech.com>
>>> ---
>>>  .../bindings/pwm/opencores,pwm-ocores.yaml    | 53 +++++++++++++++++++
>>>  1 file changed, 53 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/pwm/opencores,pwm-ocores.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/pwm/opencores,pwm-ocores.yaml b/Documentation/devicetree/bindings/pwm/opencores,pwm-ocores.yaml
>>> new file mode 100644
>>> index 000000000000..0f6a3434f155
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/pwm/opencores,pwm-ocores.yaml
>>> @@ -0,0 +1,53 @@
>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/pwm/opencores,pwm-ocores.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: OpenCores PWM controller
>>> +
>>> +maintainers:
>>> +  - William Qiu <william.qiu@starfivetech.com>
>>> +
>>> +description:
>>> +  OpenCores PTC ip core contains a PWM controller. When operating in PWM mode, the PTC core
>>> +  generates binary signal with user-programmable low and high periods. All PTC counters and
>>> +  registers are 32-bit.
>>> +
>>> +allOf:
>>> +  - $ref: pwm.yaml#
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - opencores,pwm-ocores
>>
>> What does the extra "ocores" suffix add, when it just repeats the vendor
>> prefix?
>>
>>> +      - starfive,jh71x0-pwm
>>
>> Krzysztof, did you approve this generic compatible?

Patch was quite different than reviewed by me. This obviously does not
make any sense. Thanks for spotting.

I guess carrying tags should not be trusted.

>>
>> And the whole thing looks like it should really be something like
>>
>> items:
>>   - enum:
>>       - starfive,jh7100-pwm
>>       - starfive,jh7110-pwm
>>   - const: opencores,pwm
> 
> (assuming that the opencores,pwm compatible represents a subset of what
> is implemented on the jh7100 series)


Best regards,
Krzysztof