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 16:46:56 +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 16:41, 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.

> 
> You are the first one since V1 to think it is inappropriate.
> 
> Please suggest what the name should be.

Depends what this is. I know nothing about this device, so I cannot
suggest you. Therefore I gave you link with ideas to choose from.

Best regards,
Krzysztof