linux-kernel - Re: [PATCH v3 5/9] ARM: dts: stm32: add Hardware debug port (HDP) on stm32mp13

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Message-ID: <42a0b7ab-d85d-4d52-a263-4a4648c7ff05@kernel.org>
Date: Wed, 11 Jun 2025 08:35:19 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Clement LE GOFFIC <clement.legoffic@...s.st.com>,
 Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Bartosz Golaszewski <brgl@...ev.pl>
Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 5/9] ARM: dts: stm32: add Hardware debug port (HDP) on
 stm32mp13

On 10/06/2025 15:33, Clement LE GOFFIC wrote:
> On 6/10/25 14:38, Krzysztof Kozlowski wrote:
>> On 10/06/2025 14:02, Clement LE GOFFIC wrote:
>>> On 5/29/25 11:01, Krzysztof Kozlowski wrote:
>>>> On 28/05/2025 14:14, Clement LE GOFFIC wrote:
>>>>>>
>>>>>>> +		};
>>>>>>> +
>>>>>>> +		hdp: pinctrl@...2a000 {
>>>>>>> +			compatible = "st,stm32mp131-hdp";
>>>>>>> +			reg = <0x5002a000 0x400>;
>>>>>>> +			clocks = <&rcc HDP>;
>>>>>>>     			status = "disabled";
>>>>>>
>>>>>> Why are you disabling it? What is missing?
>>>>>
>>>>> Nothing is missing just disabled by default.
>>>>> The node is then enabled when needed in board's dts file.
>>>> Nodes should not be disabled by default if they are complete. That's why
>>>> I asked what is missing. Drop.
>>>
>>> Hi Krzysztof, OK I better understand now.
>>> So yes the 'pinctrl-*' properties which are board dependent are lacking.
>>
>> These are not properties of this node.
> 
> Does this mean I should add 'pinctrl-*' properties in bindings yaml file ?
> I don't get it..

These properties have no meaning here, so the hardware description is
complete. You claim that you miss them thus device is incomplete is just
not correct: these properties do not belong here! They belong to the
board but even there they are totally optional. Why would they be a
required resource?

To remind: we talk here ONLY about required resources.

> 
>>>
>>> In the last patch of my serie I add them (only for stm32mp157f-dk2) but
>>> keep it disabled because the pin is on an external connector (the
>>> Arduino connector of the board).
>>> This prevent any issue with a possible connected module.
>>
>> Not relevant. Pin control for connector are board specific, but pinctrl
>> SoC part is SoC.
> 
> I think we don't understand each other here too. I don't understand the 
> end of your sentence "pinctrl SoC part is SoC".

Please read first how DTS is organized.

The pin controller device is part of SoC not part of a board.

Pins configuration for devices on the board are not part of the SoC.
What is not clear here? We talk here in terms how DTS is supposed to be
organized.

> 
> Maybe some informations that could help:
> The 'pinctrl-*' properties are used in the HDP case to select the 
> internal signal to output AND the alternate function on the pin to 
> output the HDP function.

We all know this.

> 
>> Best regards,
>> Krzysztof
> 


Best regards,
Krzysztof