linux-kernel - Re: [PATCH 2/4] dt-bindings: pinctrl: Document nuvoton ma35d1 pin control

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Message-ID: <c6394168-97a3-46c7-839a-ec0928ffb3b5@gmail.com>
Date:   Wed, 18 Oct 2023 15:01:08 +0800
From:   Jacky Huang <ychuang570808@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        linus.walleij@...aro.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        p.zabel@...gutronix.de, j.neuschaefer@....net
Cc:     linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        schung@...oton.com, Jacky Huang <ychuang3@...oton.com>
Subject: Re: [PATCH 2/4] dt-bindings: pinctrl: Document nuvoton ma35d1 pin
 control


Dear Krzysztof,

Thank you for the review.


On 2023/10/18 下午 01:58, Krzysztof Kozlowski wrote:
> On 18/10/2023 05:26, Jacky Huang wrote:
>> Dear Krzysztof,
>>
>> Thank you for the review.
>>
>>
>> On 2023/10/17 上午 03:52, Krzysztof Kozlowski wrote:
>>> On 16/10/2023 06:32, Jacky Huang wrote:
>>>>>> +  '#size-cells':
>>>>>> +    const: 1
>>>>>> +
>>>>>> +  nuvoton,sys:
>>>>>> +    description:
>>>>>> +      phandle to the syscon node
>>>>> sys is quite generic. Description explains nothing except duplicating
>>>>> known information. Drop duplicated info and instead explain to what this
>>>>> phandle points and how it is going to be used.
>>> Read comments carefully.
>>
>> I will update the description of 'nuvoton,sys'.
> What is the full name of destination block?


The full name is 'system-management'. From:

         sys: system-management@...60000 {
             compatible = "nuvoton,ma35d1-reset", "syscon";
             reg = <0x0 0x40460000 0x0 0x200>;
             #reset-cells = <1>;
         };


>>>>>> +    $ref: /schemas/types.yaml#/definitions/phandle-array
>>>>>> +    items:
>>>>>> +      maxItems: 1
>>>>> So just phandle, not phandle-array, unless it is defined like this in
>>>>> some other binding.
>>>> I would like to update this as:
>>>>
>>>>      nuvoton,sys:
>>> Nothing improved.
>> Here just fix  the 'phandle-array' to 'phandle' and remove 'maxItems'.
>>
>>>>        $ref: /schemas/types.yaml#/definitions/phandle
>>>>        description:
>>>>          Help pinctrl driver to access system registers by means of regmap.
>>> Driver is not relevant here. Say which part of syscon are necessary for
>>> pinctrl operation.
>>>
>> I will update description as:
>>
>>     nuvoton,sys:
>>       $ref: /schemas/types.yaml#/definitions/phandle
>>       description:
>>         The pin function control registers are located in the system
>>         control register space. This phandle provides pinctrl the
>>         ability to access the pin function control registers through
>>         the use of regmap.
> regmap is unrelated to the bindings.

So, I will just update the description as:

phandle of the system-management node.


>>>>>> +        maximum: 7
>>>>>> +
>>>>>> +      input-enable: true
>>>>>> +
>>>>>> +      input-schmitt-enable: true
>>>>>> +
>>>>>> +      power-source:
>>>>>> +        description:
>>>>>> +          I/O voltage in millivolt.
>>>>>> +        enum: [ 1800, 3300 ]
>>>>> Missing units in property name. power-source also does not really
>>>>> describe the property.
>>>> The output voltage level of GPIO can be configured as 1.8V or 3.3V,
>>>> but I cannot find any suitable output properties in 'pincfg-node.yaml.'
>>> There is actually power-source, but treated as actual choice of power
>>> supplies.
>>>
>>>> I noticed that 'xlnx,zynq-pinctrl.yaml' and 'xlnx,zynq-pinctrl.yaml' use
>>>> 'power source' to specify the output voltage.  Should I follow their
>>>> approach or define a vendor-specific one?
>>> Maybe Rob or Linus have here some recommendation, but I would suggest to
>>> go either with rtd1319d-pinctrl.yaml approach or add a generic property
>>> to pincfg-node expressed in real units like "io-microvolt".
>> OK, I will update it as:
>>
>>         power-source:
>>           description: |
>>             Valid arguments are described as below:
>>             0: power supply of 1.8V
>>             1: power supply of 3.3V
>>           enum: [0, 1]
>>
>>
>>> Rob, Linus, any ideas for generic property replacing register-specific
>>> power-source?
> I proposed io-microvolt
>
> Best regards,
> Krzysztof
>

I will use 'io-microvolt' once it is available.



Best Regards,
Jacky Huang