linux-kernel - Re: [[PATCH v2] 1/9] dt-bindings: pwm: Document Synopsys DesignWare snps,pwm

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Message-ID: <d335c1a6-ad45-994c-053f-32cdfa4cab8d@sifive.com>
Date:   Wed, 27 Jul 2022 11:45:02 +0100
From:   Ben Dooks <ben.dooks@...ive.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linux-pwm@...r.kernel.org
Cc:     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>
Subject: Re: [[PATCH v2] 1/9] dt-bindings: pwm: Document Synopsys DesignWare
 snps,pwm

On 26/07/2022 12:05, Krzysztof Kozlowski wrote:
> On 26/07/2022 12:12, Ben Dooks wrote:
>> On 26/07/2022 11:05, Krzysztof Kozlowski wrote:
>>> On 25/07/2022 23:21, Ben Dooks wrote:
>>>> Add documentation for the bindings for Synopsys' DesignWare PWM block
>>>> as we will be adding DT/platform support to the Linux driver soon.
>>>>
>>>> Signed-off-by: Ben Dooks <ben.dooks@...ive.com>
>>>> --
>>>
>>> This is not proper delimiter and causes the changelog to end up in commit.
>>>
>>> Correct also wrong formatting of subject PATCH.
>>
>> I realised that once sent and forgot the cover letter.
>> Maybe I'll try some more post covid recovery.
>>
>>>> v2:
>>>> - fix #pwm-cells to be 3
>>>> - fix indentation and ordering issues
>>>> ---
>>>>    .../devicetree/bindings/pwm/snps,pwm.yaml     | 40 +++++++++++++++++++
>>>>    1 file changed, 40 insertions(+)
>>>>    create mode 100644 Documentation/devicetree/bindings/pwm/snps,pwm.yaml
>>>>
>>>> diff --git a/Documentation/devicetree/bindings/pwm/snps,pwm.yaml b/Documentation/devicetree/bindings/pwm/snps,pwm.yaml
>>>> new file mode 100644
>>>> index 000000000000..594085e5e26f
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/pwm/snps,pwm.yaml
>>>> @@ -0,0 +1,40 @@
>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>> +# Copyright (C) 2022 SiFive, Inc.
>>>> +%YAML 1.2
>>>> +---
>>>> +$id: http://devicetree.org/schemas/pwm/snps,pwm.yaml#
>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>> +
>>>> +title: Synopsys PWM controller
>>>> +
>>>> +maintainers:
>>>> +  - Ben Dooks <ben.dooks@...ive.com>
>>>> +
>>>> +allOf:
>>>> +  - $ref: pwm.yaml#
>>>> +
>>>> +properties:
>>>> +  compatible:
>>>> +    const: snps,pwm
>>>
>>> This is very generic compatible. I doubt that you cover here all
>>> Synopsys PWM designs, past and future. You need a specific compatible.
>>
>>   From what I can get from the documentation (2.13a) there hasn't been
>> a huge external interface change and what has been added is all part
>> of synthesis time options.
> 
> But you have some specific version, right? Usually these blocks are
> versioned, so you must include it. I would even argue that such generic
> compatible should not be used as fallback at all, because it is simply
> to generic (PWM is not some model name but common acronym),

Thank you for the feedback, forgot to say that on the original reply.

-- 
Ben