[PATCH v4 09/12] pinctrl: stm32: Support I/O synchronization parameters

[Linus Walleij]

On Thu, Oct 23, 2025 at 3:27 PM Antonio Borneo
<antonio.borneo at foss.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 at foss.st.com>
> Signed-off-by: Valentin Caron <valentin.caron at foss.st.com>
> Co-developed-by: Fabien Dessenne <fabien.dessenne at foss.st.com>
> Signed-off-by: Fabien Dessenne <fabien.dessenne at foss.st.com>
> Signed-off-by: Antonio Borneo <antonio.borneo at foss.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