linux-kernel - Re: [PATCH v2 1/4] dt-bindings: clock: sophgo: Add clock controller of CV1800 series SoC

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Message-ID: <IA1PR20MB4953B8844BCAB9EDB9309309BB84A@IA1PR20MB4953.namprd20.prod.outlook.com>
Date:   Wed,  6 Dec 2023 10:04:12 +0800
From:   Inochi Amaoto <inochiama@...look.com>
To:     Conor Dooley <conor@...nel.org>
Cc:     Inochi Amaoto <inochiama@...look.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen Wang <unicorn_wang@...look.com>,
        Jisheng Zhang <jszhang@...nel.org>, qiujingbao.dlmu@...il.com,
        dlan@...too.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] dt-bindings: clock: sophgo: Add clock controller of CV1800 series SoC

>
>> On Tue, Dec 05, 2023 at 07:55:50PM +0800, Inochi Amaoto wrote:
>>> Add definition for the clock controller of the CV1800 series SoC.
>>>
>>> Signed-off-by: Inochi Amaoto <inochiama@...look.com>
>>> Link: https://github.com/milkv-duo/duo-files/blob/main/hardware/CV1800B/CV1800B-CV1801B-Preliminary-Datasheet-full-en.pdf
>>> ---
>>>  .../bindings/clock/sophgo,cv1800-clk.yaml     |  53 ++++++
>>>  include/dt-bindings/clock/sophgo,cv1800.h     | 174 ++++++++++++++++++
>>>  2 files changed, 227 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/clock/sophgo,cv1800-clk.yaml
>>>  create mode 100644 include/dt-bindings/clock/sophgo,cv1800.h
>>>
>>> diff --git a/Documentation/devicetree/bindings/clock/sophgo,cv1800-clk.yaml b/Documentation/devicetree/bindings/clock/sophgo,cv1800-clk.yaml
>>> new file mode 100644
>>> index 000000000000..388be5bfa163
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/clock/sophgo,cv1800-clk.yaml
>>> @@ -0,0 +1,53 @@
>>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/clock/sophgo,cv1800-clk.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Sophgo CV1800 Series Clock Controller
>>> +
>>> +maintainers:
>>> +  - Inochi Amaoto <inochiama@...look.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    enum:
>>> +      - sophgo,cv1800-clk
>>> +      - sophgo,cv1810-clk
>>
>> I'm not reading 1000s of lines of driver code to figure it out, what
>> differs in the programming model for these two devices?
>
>In fact, they have no different in the programming model. The only
>different between them is that cv1810 have one extra clock.
>
>> You should
>> mention in your commit message why the cv1810 has an incompatible
>> programming model if you are adding multiple devices in one commit
>> message.
>>
>
>OK, I will
>
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +  clocks:
>>> +    items:
>>> +      - description: Oscillator (25 MHz)
>>
>> This could just be "maxItems: 1".
>>
>
>OK, thanks.
>


>>> +
>>> +  clock-names:
>>> +    items:
>>> +      - const: osc
>>
>> You have one clock, why do you need a name?
>
>I am not pretty familiar with this. I just wrote this binding by
>referencing others. Maybe use "maxItems: 1" is just fine?
>

I have referenced this name in the clk_parent_data as the global clock
parent. Removing this will cause driver broken.

>>
>> Otherwise, this looks okay, thanks.
>>
>>
>