Re: [PATCH v7 06/12] dt-bindings: pinctrl: deprecate SIUL2 pinctrl bindings

[Krzysztof Kozlowski]

On Thu, Jul 10, 2025 at 05:20:29PM +0300, Andrei Stefanescu wrote:
> The existing SIUL2 pinctrl bindings don't correctly describe the
> hardware. The SIUL2 module also offers GPIO control and exposes some
> registers which contain information about the SoC. Adding drivers for
> these functionalities would result in incorrect bindings with a lot of
> carved out regions for registers. For more details see the discussions
> on the community [1] and [2].
> 
> The existing SIUL2 pinctrl dt-bindings will be deprecated. The new SIUL2
> MFD dt-bindings are to be used from now on.
> 
> [1] -
> https://lore.kernel.org/linux-gpio/20241003-overall-unblended-7139b17eae23@spud/
> [2] -
> https://lore.kernel.org/all/a924bbb6-96ec-40be-9d82-a76b2ab73afd@xxxxxxxxxxx/

After fast glance I see only nvmem is outside and missing in these
bindings. I don't see a problem nvmem being a separate device node, so I
don't see justification for dropping old bindings.

Anyway, bring the full raltionale here - describe the memory layout
proving that you cannot add nvmem and GPIO in your system without
breaking ABI or without making this binding unreadable.

Best regards,
Krzysztof