linux-kernel - Re: [PATCH 04/14] dt-bindings: pinctrl: stm32: add RSVD mux function

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Message-ID: <53f2e315-1a80-4d03-96a6-30604a96d3ad@kernel.org>
Date: Thu, 24 Oct 2024 15:22:42 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Antonio Borneo <antonio.borneo@...s.st.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>, Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>,
 linux-gpio@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
 Clément Le Goffic <clement.legoffic@...s.st.com>,
 Stephane Danieau <stephane.danieau@...s.st.com>,
 Amelie Delaunay <amelie.delaunay@...s.st.com>,
 Fabien Dessenne <fabien.dessenne@...s.st.com>,
 Valentin Caron <valentin.caron@...s.st.com>,
 Gatien Chevallier <gatien.chevallier@...s.st.com>,
 Cheick Traore <cheick.traore@...s.st.com>,
 linux-stm32@...md-mailman.stormreply.com
Subject: Re: [PATCH 04/14] dt-bindings: pinctrl: stm32: add RSVD mux function

On 23/10/2024 10:56, Antonio Borneo wrote:
> On Wed, 2024-10-23 at 10:47 +0200, Krzysztof Kozlowski wrote:
>> On Tue, Oct 22, 2024 at 05:56:48PM +0200, Antonio Borneo wrote:
>>> From: Fabien Dessenne <fabien.dessenne@...s.st.com>
>>>
>>> Document the RSVD (Reserved) mux function, used to reserve pins
>>> for a coprocessor not running Linux.
>>>
>>> Signed-off-by: Fabien Dessenne <fabien.dessenne@...s.st.com>
>>> Signed-off-by: Antonio Borneo <antonio.borneo@...s.st.com>
>>> ---
>>>  .../devicetree/bindings/pinctrl/st,stm32-pinctrl.yaml     | 8 ++++++++
>>>  include/dt-bindings/pinctrl/stm32-pinfunc.h               | 1 +
>>>  2 files changed, 9 insertions(+)
>>>
>>
>> BTW, which *existing* SoCs use it? Aren't you adding it for the new
>> platform?
>>
> 
> This is already used in ST downstream kernel for STM32MP15x
> In this example
> https://github.com/STMicroelectronics/linux/blob/v6.1-stm32mp/arch/arm/boot/dts/stm32mp157f-dk2-m4-examples.dts#L112
> 
> the GPIOs for LED and for PWM are assigned to the Cortex-M4 and Linux (on Cortex-A7) is not supposed to touch them.

I wasn't clear. Which upstream uses it? We really could not care less
about downstream vendor code.

Best regards,
Krzysztof