linux-kernel - Re: [PATCH v6 1/4] dt-bindings: pwm: Add OpenCores PWM module

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Message-ID: <df75405e-e154-4974-8e21-be5f0745ed65@starfivetech.com>
Date:   Mon, 23 Oct 2023 16:00:51 +0800
From:   William Qiu <william.qiu@...rfivetech.com>
To:     Conor Dooley <conor@...nel.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 v6 1/4] dt-bindings: pwm: Add OpenCores PWM module



On 2023/10/20 22:21, 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@...rfivetech.com>
>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> Reviewed-by: Hal Feng <hal.feng@...rfivetech.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@...rfivetech.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?
> 
> And the whole thing looks like it should really be something like
> 
> items:
>   - enum:
>       - starfive,jh7100-pwm
>       - starfive,jh7110-pwm
>   - const: opencores,pwm
> 
> Cheers,
> Conor.
> 
I'm going to use this format.
Thanks,
William
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  clocks:
>> +    maxItems: 1
>> +
>> +  resets:
>> +    maxItems: 1
>> +
>> +  "#pwm-cells":
>> +    const: 3
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +  - clocks
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    pwm@...90000 {
>> +        compatible = "opencores,pwm-ocores";
>> +        reg = <0x12490000 0x10000>;
>> +        clocks = <&clkgen 181>;
>> +        resets = <&rstgen 109>;
>> +        #pwm-cells = <3>;
>> +    };
>> -- 
>> 2.34.1
>>