linux-kernel - Re: [PATCH v8 05/10] dt-bindings: sc16is7xx: Add property to change GPIO function

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Date:   Wed, 7 Jun 2023 16:57:48 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Hugo Villeneuve <hugo@...ovil.com>
Cc:     gregkh@...uxfoundation.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        jirislaby@...nel.org, jringle@...dpoint.com,
        jesse.sung@...onical.com, isaac.true@...onical.com,
        l.perczak@...lintechnologies.com, tomasz.mon@...lingroup.com,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
        Hugo Villeneuve <hvilleneuve@...onoff.com>,
        stable@...r.kernel.org, Conor Dooley <conor.dooley@...rochip.com>,
        Lech Perczak <lech.perczak@...lingroup.com>
Subject: Re: [PATCH v8 05/10] dt-bindings: sc16is7xx: Add property to change
 GPIO function

On 07/06/2023 16:52, Hugo Villeneuve wrote:
> On Wed, 7 Jun 2023 16:46:56 +0200
> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> 
>> On 07/06/2023 16:41, Hugo Villeneuve wrote:
>>> On Wed, 7 Jun 2023 16:30:26 +0200
>>> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
>>>
>>>> On 07/06/2023 16:05, Hugo Villeneuve wrote:
>>>>> From: Hugo Villeneuve <hvilleneuve@...onoff.com>
>>>>>
>>>>> Some variants in this series of UART controllers have GPIO pins that
>>>>> are shared between GPIO and modem control lines.
>>>>>
>>>>> The pin mux mode (GPIO or modem control lines) can be set for each
>>>>> ports (channels) supported by the variant.
>>>>>
>>>>> This adds a property to the device tree to set the GPIO pin mux to
>>>>> modem control lines on selected ports if needed.
>>>>>
>>>>> Cc: <stable@...r.kernel.org> # 6.1.x
>>>>> Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
>>>>> Acked-by: Conor Dooley <conor.dooley@...rochip.com>
>>>>> Reviewed-by: Lech Perczak <lech.perczak@...lingroup.com>
>>>>> ---
>>>>>  .../bindings/serial/nxp,sc16is7xx.txt         | 46 +++++++++++++++++++
>>>>>  1 file changed, 46 insertions(+)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
>>>>> index 0fa8e3e43bf8..1a7e4bff0456 100644
>>>>> --- a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
>>>>> +++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
>>>>> @@ -23,6 +23,9 @@ Optional properties:
>>>>>      1 = active low.
>>>>>  - irda-mode-ports: An array that lists the indices of the port that
>>>>>  		   should operate in IrDA mode.
>>>>> +- nxp,modem-control-line-ports: An array that lists the indices of the port that
>>>>> +				should have shared GPIO lines configured as
>>>>> +				modem control lines.
>>>>>  
>>>>>  Example:
>>>>>          sc16is750: sc16is750@51 {
>>>>> @@ -35,6 +38,26 @@ Example:
>>>>>                  #gpio-cells = <2>;
>>>>>          };
>>>>>  
>>>>> +	sc16is752: sc16is752@53 {
>>>>
>>>> Since you keep sending new versions, fix the names. nNode names should
>>>> be generic. See also explanation and list of examples in DT specification:
>>>> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation
>>>
>>> Hi,
>>> by the way, I do not "keep sending new versions" just for the fun of
>>> it...
>>
>> Sure, I know. So when the next version is necessary to send, fix also this.
>>
>>>
>>> Even after reading your link, I cannot see what is wrong with that
>>> name.
>>
>> They are not generic. They are specific.
> 
> What do you mean by "They"? My patch adds only a new property...

Your patch adds multiple new examples. My comment was at appropriate
place to fix, although only the first place. I did not refer to
unrelated pieces or other parts of the code. Specifically - I wrote
nothing about property.

> 
> This patch will not fix old names, but a future patch could do it.

No worries, I asked for new code.

> 
> And what do you mean by "They are not generic. They are specific". Of
> course the property is specific, because it relates to something very
> specific to this chip?

Again, I did not comment under a property. I did not refer to any property.


Best regards,
Krzysztof