linux-kernel - Re: [PATCH v3 1/3] dt-bindings: pinctrl: Add support for Amlogic A4 SoCs

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Message-ID: <d654d2b2-977b-44c0-8b01-b26f5eb0a3fe@kernel.org>
Date: Fri, 18 Oct 2024 12:13:14 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Jerome Brunet <jbrunet@...libre.com>,
 Xianwei Zhao <xianwei.zhao@...ogic.com>
Cc: Linus Walleij <linus.walleij@...aro.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Neil Armstrong <neil.armstrong@...aro.org>,
 Kevin Hilman <khilman@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 Bartosz Golaszewski <brgl@...ev.pl>, linux-gpio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] dt-bindings: pinctrl: Add support for Amlogic A4
 SoCs

On 18/10/2024 11:20, Jerome Brunet wrote:
> On Fri 18 Oct 2024 at 17:01, Xianwei Zhao <xianwei.zhao@...ogic.com> wrote:
> 
>> Hi Jerome,
>>    Thanks for your reply.
>>
>> On 2024/10/18 16:39, Jerome Brunet wrote:
>>> [ EXTERNAL EMAIL ]
>>> On Fri 18 Oct 2024 at 10:28, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>>>
>>>> On 18/10/2024 10:10, Xianwei Zhao via B4 Relay wrote:
>>>>> From: Xianwei Zhao <xianwei.zhao@...ogic.com>
>>>>>
>>>>> Add the new compatible name for Amlogic A4 pin controller, and add
>>>>> a new dt-binding header file which document the detail pin names.
>>> the change does not do what is described here. At least the description
>>> needs updating.
>>>
>>
>> Will do.
>>
>>> So if the pin definition is now in the driver, does it mean that pins have
>>> to be referenced in DT directly using the made up numbers that are
>>> created in pinctrl-amlogic-a4.c at the beginning of patch #2 ?
>>>
>>
>> Yes.
>>
>>> If that's case, it does not look very easy a read.
>>>
>>
>> It does happen. The pin definition does not fall under the category of
>> binding.
>>
>> https://lore.kernel.org/all/106f4321-59e8-49b9-bad3-eeb57627c921@amlogic.com/
> 
> So the expectation is that people will write something like:
> 
>  reset-gpios = <&gpio 42 GPIO_ACTIVE_LOW>;
> 
> And others will go in the driver to see that is maps to GPIOX_10 ? the number
> being completly made up, with no link to anything HW/Datasheet
> whatsoever ?
> 
> This is how things should be done now ?

Why would you need to do this? Why it cannot be <&gpio 10
GPIO_ACTIVE_LOW>, assuming it is GPIO 10?

Bindings have absolutely nothing to do with it. You have GPIO 10, not
42, right?

Best regards,
Krzysztof