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

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Message-ID: <20231020-giddy-fidgety-f070ef121ff2@spud>
Date:   Fri, 20 Oct 2023 15:22:22 +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

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@...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

(assuming that the opencores,pwm compatible represents a subset of what
is implemented on the jh7100 series)

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