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

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Message-ID: <680f3e0b7458015d5b909200342a623eb55f907d.camel@foss.st.com>
Date: Wed, 23 Oct 2024 10:56:57 +0200
From: Antonio Borneo <antonio.borneo@...s.st.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
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 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.

Regards,
Antonio