linux-kernel - Re: [PATCH v4 09/12] pinctrl: stm32: Support I/O synchronization parameters

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Message-ID: <CACRpkdZoecqkKfXmu4ih3qb00OMPmAtJVvyqerXf52n+s7vFxg@mail.gmail.com>
Date: Mon, 27 Oct 2025 23:14:53 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Antonio Borneo <antonio.borneo@...s.st.com>
Cc: 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>, linux-gpio@...r.kernel.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-stm32@...md-mailman.stormreply.com, 
	linux-arm-kernel@...ts.infradead.org, 
	Christophe Roullier <christophe.roullier@...s.st.com>, 
	Fabien Dessenne <fabien.dessenne@...s.st.com>, Valentin Caron <valentin.caron@...s.st.com>
Subject: Re: [PATCH v4 09/12] pinctrl: stm32: Support I/O synchronization parameters

On Thu, Oct 23, 2025 at 3:27 PM Antonio Borneo
<antonio.borneo@...s.st.com> wrote:

> Devices in the stm32mp2xx family include an I/O synchronization
> block on each pin that is used to fine tune and improve the I/O
> timing margins of high speed synchronous interfaces.
> It can be configured to provide independently for each pin:
> - skew rate on input direction or latch delay on output direction;
> - inversion of clock signals or re-sampling of data signals.
>
> Add support for the generic properties:
> - skew-delay-input-ps;
> - skew-delay-output-ps.
>
> Add support for the property 'st,io-sync' to configure clock
> inversion or data re-sampling mode.
>
> Show the new parameters on debugfs pinconf-pins.
>
> Enable it for the stm32mp257 pinctrl driver.
>
> Co-developed-by: Valentin Caron <valentin.caron@...s.st.com>
> Signed-off-by: Valentin Caron <valentin.caron@...s.st.com>
> Co-developed-by: Fabien Dessenne <fabien.dessenne@...s.st.com>
> Signed-off-by: Fabien Dessenne <fabien.dessenne@...s.st.com>
> Signed-off-by: Antonio Borneo <antonio.borneo@...s.st.com>

Patch applied!

I'm really happy about how this turned out, lots of generic improvement
with this as the end result!

Yours,
Linus Walleij