linux-kernel - Re: [PATCH 04/15] dt-bindings: arm: add support for Ambarella SoC

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Message-ID: <2b210dc5-fe63-d295-a488-2988601424f3@linaro.org>
Date:   Mon, 23 Jan 2023 16:52:47 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Li Chen <me@...ux.beauty>
Cc:     Li Chen <lchen@...arella.com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "moderated list:ARM/Ambarella SoC support" 
        <linux-arm-kernel@...ts.infradead.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/15] dt-bindings: arm: add support for Ambarella SoC

On 23/01/2023 16:09, Li Chen wrote:
> On Mon, 23 Jan 2023 16:07:32 +0800,
> Krzysztof Kozlowski wrote:
>>
>> On 23/01/2023 08:32, Li Chen wrote:
>>> Create a vendor directory for Ambarella, and add
>>> cpuid, rct, scratchpad documents.
>>>
>>> Signed-off-by: Li Chen <lchen@...arella.com>
>>> Change-Id: I2c29e45c08666489b0d9b588ac37d713f5b723d1
>>
>> Please run scripts/checkpatch.pl and fix reported warnings.
>>
>> Applies to all your patches. Also test them... I have doubts that you
>> tested if you actually ignored checkpatch :/
> 
> Yeah, I checkpatch all patches, and have planned to fix Change-Id finally(manually),
> but forget it before sending mails, my bad, sorry. I will remove it in v2.
> 
>>> ---
>>>  .../arm/ambarella/ambarella,cpuid.yaml        | 24 +++++++++++++++++++
>>>  .../bindings/arm/ambarella/ambarella,rct.yaml | 24 +++++++++++++++++++
>>>  .../arm/ambarella/ambarella,scratchpad.yaml   | 24 +++++++++++++++++++
>>>  .../bindings/arm/ambarella/ambarella.yaml     | 22 +++++++++++++++++
>>>  MAINTAINERS                                   |  4 ++++
>>>  5 files changed, 98 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/arm/ambarella/ambarella,cpuid.yaml
>>>  create mode 100644 Documentation/devicetree/bindings/arm/ambarella/ambarella,rct.yaml
>>>  create mode 100644 Documentation/devicetree/bindings/arm/ambarella/ambarella,scratchpad.yaml
>>>  create mode 100644 Documentation/devicetree/bindings/arm/ambarella/ambarella.yaml
>>>
>>> diff --git a/Documentation/devicetree/bindings/arm/ambarella/ambarella,cpuid.yaml b/Documentation/devicetree/bindings/arm/ambarella/ambarella,cpuid.yaml
>>> new file mode 100644
>>> index 000000000000..1f4d9cec8f92
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/arm/ambarella/ambarella,cpuid.yaml
>>
>> This goes to soc
> 
> Thanks, I wasn't aware that there is a document dir named soc. I will move cpuid yaml
> to bindings/soc/ambarella/, and leave other yaml still here.

However if device has chip identification features (chipid), then the
location is "hwinfo".

> 
>>> @@ -0,0 +1,24 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/clock/ambarella,cpuid.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Ambarella SoC ID
>>> +
>>> +maintainers:
>>> +  - Li Chen <lchen@...arella.com>
>>
>> Missing description.
> 
> Sorry, description will be added in v2. BTW, does other YAMLs in this patch
> also need descriptions?

In general yes - we want descriptions which will bring additional
information. Description should not repeat title, but add more data. For
trivial cases - maybe actually this one SoC ID - you can skip it.



> 
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: "ambarella,cpuid", "syscon"
>>
>> Drop quotes (applies to all your patches)
> 
> OK, thanks!
> 
>> Missing SoC specific compatible.
>>
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>
>> Missing additionalProperties. sorry, start from scratch from some
>> existing recent bindings or better example-schema.
> 
> Good to know that there is example-schema, thanks!
>  
>>> +
>>> +examples:
>>> +  - |
>>> +    cpuid_syscon: cpuid@...00000 {
>>> +        compatible = "ambarella,cpuid", "syscon";
>>> +        reg = <0xe0000000 0x1000>;
>>> +    };
>>> diff --git a/Documentation/devicetree/bindings/arm/ambarella/ambarella,rct.yaml b/Documentation/devicetree/bindings/arm/ambarella/ambarella,rct.yaml
>>> new file mode 100644
>>> index 000000000000..7279bab17d9e
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/arm/ambarella/ambarella,rct.yaml
>>> @@ -0,0 +1,24 @@
>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/clock/ambarella,rct.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Ambarella RCT module
>>> +
>>> +maintainers:
>>> +  - Li Chen <lchen@...arella.com>
>>> +
>>> +properties:
>>> +  compatible:
>>> +    const: "ambarella,rct", "syscon"
>>
>> All the same problems.
> 
> Well noted.
> 
>>> +
>>> +  reg:
>>> +    maxItems: 1
>>> +
>>> +examples:
>>> +  - |
>>> +		rct_syscon: rct_syscon@...80000 {
>>
>> Really? Just take a look and you will see wrong indentation. Also drop
>> underscores in node names and "rct". Node names should be generic.
> 
> Sorry for the wrong indentation, will fix it in v2.
> 
> Is it ok to contain underscores in lable? if so, I will change it into
> 
> rct_syscon: syscon@...80000 {

Yes, label can have it.

Best regards,
Krzysztof