linux-kernel - Re: [PATCH 3/7] pwm: dwc: add of/platform support

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Message-ID: <20220712221715.GT1823936-robh@kernel.org>
Date:   Tue, 12 Jul 2022 16:17:15 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ben Dooks <ben.dooks@...ive.com>
Cc:     linux-pwm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        u.kleine-koenig@...gutronix.de,
        Thierry Reding <thierry.reding@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Greentime Hu <greentime.hu@...ive.com>,
        Jude Onyenegecha <jude.onyenegecha@...ive.com>,
        Sudip Mukherjee <sudip.mukherjee@...ive.com>,
        William Salmon <william.salmon@...ive.com>,
        Adnan Chowdhury <adnan.chowdhury@...ive.com>
Subject: Re: [PATCH 3/7] pwm: dwc: add of/platform support

On Tue, Jul 12, 2022 at 11:01:09AM +0100, Ben Dooks wrote:
> The dwc pwm controller can be used in non-PCI systems, so allow
> either platform or OF based probing.
> 
> Signed-off-by: Ben Dooks <ben.dooks@...ive.com>
> ---
>  .../devicetree/bindings/pwm/pwm-synposys.yaml | 40 ++++++++++++++

Use compatible string for filename.

>  drivers/pwm/Kconfig                           |  5 +-
>  drivers/pwm/pwm-dwc.c                         | 53 +++++++++++++++++++
>  3 files changed, 96 insertions(+), 2 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/pwm/pwm-synposys.yaml
> 
> diff --git a/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml b/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml
> new file mode 100644
> index 000000000000..38ac0da75272
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pwm/pwm-synposys.yaml
> @@ -0,0 +1,40 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2022 SiFive, Inc.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pwm/pwm-synposys.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Synopsys PWM controller
> +
> +maintainers:
> +   - Ben Dooks <ben.dooks@...ive.com>
> +
> +properties:
> +  "#pwm-cells":
> +    description: |
> +      See pwm.yaml in this directory for a description of the cells format.

pwm.yaml doesn't define how many cells. You need to. And you don't need 
generic descriptions.

> +
> +  clocks:
> +    items:
> +      - description: Interface bus clock
> +      - description: PWM reference clock
> +
> +  clock-names:
> +    items:
> +      - const: bus
> +      - const: timer
> +
> +  compatible:

Convention is compatible comes first in the list.

> +    oneOf:
> +      - items:
> +        - const: snps,pwm

Don't need oneOf or items. Just 'const: snps,pwm'.

That's pretty generic for a compatible. There's only 1 version of the IP 
or is the version discoverable?

> +
> +required:
> +  - "#pwm-cells"
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +
> +additionalProperties: false