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

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Date:   Fri, 20 Oct 2023 15:21:15 +0100
From:   Conor Dooley <conor@...nel.org>
To:     William Qiu <william.qiu@...rfivetech.com>
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

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.

> +
> +  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
> 

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