linux-kernel - Re: [PATCH v4 1/3] dt-bindings: phy: Add starfive,jh7110-dphy-rx

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Date:   Wed, 12 Apr 2023 18:55:31 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Changhuang Liang <changhuang.liang@...rfivetech.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Emil Renner Berthing <kernel@...il.dk>,
        Conor Dooley <conor@...nel.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Philipp Zabel <p.zabel@...gutronix.de>
Cc:     Jack Zhu <jack.zhu@...rfivetech.com>,
        linux-phy@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 1/3] dt-bindings: phy: Add starfive,jh7110-dphy-rx

On 12/04/2023 14:42, Changhuang Liang wrote:
> 
> 
> On 2023/4/12 19:34, Krzysztof Kozlowski wrote:
>> On 12/04/2023 10:45, Changhuang Liang wrote:
>>> StarFive SoCs like the jh7110 use a MIPI D-PHY RX controller based on
>>> a M31 IP. Add a binding for it.
>>
>> So this is D-PHY? Or the other patch is D-PHY? The naming is quite
>> confusing and your commit msgs are not helping here.
>>
>> Also the power domain phandle here adds to the confusion.
>>
> 
> Yes, this is DPHY, DPHY has rx and tx, and last version we are discussing that 
> use power domain replace syscon:
> https://lore.kernel.org/all/5dc4ddc2-9d15-ebb2-38bc-8a544ca67e0d@starfivetech.com/

The other patch - DPHY PMU - is confusing. Instead of writing short
commits, explain more.

> 
>>>
>>> Signed-off-by: Changhuang Liang <changhuang.liang@...rfivetech.com>
>>> ---
>>>  .../bindings/phy/starfive,jh7110-dphy-rx.yaml | 85 +++++++++++++++++++
>>>  1 file changed, 85 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/phy/starfive,jh7110-dphy-rx.yaml
>>>
> [...]
>>> +
>>> +  power-domains:
>>> +    maxItems: 1
>>> +
>>> +  lane_maps:
>>
>> Why did this appear? Underscores are not allowed. It looks like you
>> re-implement some standard property.
>>
> 
> Will change to lane-maps.
> Yes, according to Vinod advice, lane mapping table use device tree
> to parse makes sense.

Hm, I have a feeling that I saw such property, so you should dig into
existing and in-flight bindings.

Best regards,
Krzysztof