linux-kernel - Re: [PATCH v4 2/3] dt-bindings: i2c-ast2600: Add support for AST2600 i2C driver

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Date:   Fri, 17 Feb 2023 09:37:20 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Ryan Chen <ryan_chen@...eedtech.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] dt-bindings: i2c-ast2600: Add support for AST2600
 i2C driver

On 16/02/2023 10:26, Ryan Chen wrote:
> Hello Krzysztof
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>> Sent: Thursday, February 16, 2023 5:22 PM
>> To: Ryan Chen <ryan_chen@...eedtech.com>; Rob Herring
>> <robh+dt@...nel.org>; Krzysztof Kozlowski
>> <krzysztof.kozlowski+dt@...aro.org>; Joel Stanley <joel@....id.au>; Andrew
>> Jeffery <andrew@...id.au>; Philipp Zabel <p.zabel@...gutronix.de>;
>> openbmc@...ts.ozlabs.org; linux-arm-kernel@...ts.infradead.org;
>> linux-aspeed@...ts.ozlabs.org; linux-kernel@...r.kernel.org
>> Subject: Re: [PATCH v4 2/3] dt-bindings: i2c-ast2600: Add support for AST2600
>> i2C driver
>>
>> On 16/02/2023 10:20, Ryan Chen wrote:
>>> Hello Krzysztof
>>>
>>>> -----Original Message-----
>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>>> Sent: Thursday, February 16, 2023 4:18 AM
>>>> To: Ryan Chen <ryan_chen@...eedtech.com>; Rob Herring
>>>> <robh+dt@...nel.org>; Krzysztof Kozlowski
>>>> <krzysztof.kozlowski+dt@...aro.org>; Joel Stanley <joel@....id.au>;
>>>> Andrew Jeffery <andrew@...id.au>; Philipp Zabel
>>>> <p.zabel@...gutronix.de>; openbmc@...ts.ozlabs.org;
>>>> linux-arm-kernel@...ts.infradead.org;
>>>> linux-aspeed@...ts.ozlabs.org; linux-kernel@...r.kernel.org
>>>> Subject: Re: [PATCH v4 2/3] dt-bindings: i2c-ast2600: Add support for
>>>> AST2600 i2C driver
>>>>
>>>> On 15/02/2023 06:43, Ryan Chen wrote:
>>>>>>> +  - $ref: /schemas/i2c/i2c-controller.yaml#
>>>>>>> +
>>>>>>> +properties:
>>>>>>> +  compatible:
>>>>>>> +    enum:
>>>>>>> +      - aspeed,ast2600-i2c
>>>>>>
>>>>>> NAK. It's already there. Please do not waste our time in submitting
>>>>>> duplicated drivers.
>>>>>
>>>>> It is not duplicated, as my description in cover " This series add
>>>>> AST2600 i2c
>>>> new register set driver"
>>>>> So, this will be different driver compatible.
>>>>> The original compatible is
>>>>>       - aspeed,ast2400-i2c-bus
>>>>>       - aspeed,ast2500-i2c-bus
>>>>>       - aspeed,ast2600-i2c-bus
>>>>> So the new register set compatible is "- aspeed,ast2600-i2c", remove
>> "bus".
>>>>
>>>> Bindings are documenting hardware, so I claim - we already have this
>>>> hardware described and this is duplicated. Otherwise - what are these
>>>> two I2C controllers and what are the differences? Why they do not
>>>> have really different name? Bus looks more like a mistake than a
>> differentiating name.
>>> For misunderstanding, or mistaken.
>>> I purpose to be aspeed,ast2600-i2cv2, will it more clear way ?
>>
>> I don't know. I still did not get answers. I asked here several questions.
> Those are different i2c controller, as I description in cover letter.

The cover letter does not explain here anything. It barely mentions "new
register set" and "separate register set". This is really short, so
without proper explanations you will get all these questions. Are they
compatible? Do they overlap? Are they completely different? If so, why
datasheet uses same name for them? So many questions but cover letter is
basically two sentences and here:

> The i2c new register mode, there have two separate slave/master register.
> And different register with old register.

you repeat the same.

> So now, avoid misunderstanding, or mistaken.
> I purpose to be aspeed,ast2600-i2cv2.


Best regards,
Krzysztof