Re: [PATCH] gpio: sim: added configfs option for static base

[Sebastian Dietz <s.dietz@xxxxxxxxxxxxxxx>]

On 28.02.25 14:22, Bartosz Golaszewski wrote:
> On Fri, Feb 28, 2025 at 1:46 PM Sebastian Dietz <s.dietz@xxxxxxxxxxxxxxx> wrote:
>>
>> To replicate gpio mappings of systems it is sometimes needed to have
>> the base at static values.
>>
> 
> Can you give me more info on why you'd need that? Static base is
> largely a legacy and deprecated feature, there's ongoing effort to
> remove it from the kernel.
> 
>> base is treated as unsigned as there doesn't happen to be a
>> fwnode_property_read_s32().
>>
> 
> Ha! That's interesting, I wonder why that is. We do have signed
> variants for OF-specific properties.
> 
> Bart

We are building digital twins for embedded devices for security research. The 
firmware of these devices often export static gpio pins which we simulate 
using gpio-sim. With this patch we are able to satisfy these conditions.

While the feature may be deprecated, i would argue that it makes sense and
fits the nature of a simulator to be able to configure it manually.

BR,
Sebastian