Re: [PATCH v3 00/10] reset: rework reset-gpios handling

Bartosz Golaszewski
2025-10-29T13:19:29Z

On Wed, Oct 29, 2025 at 2:16 PM Philipp Zabel <p.zabel@pengutronix.de> wrote:
>
> On Mi, 2025-10-29 at 13:28 +0100, Bartosz Golaszewski wrote:
> > Machine GPIO lookup is a nice, if a bit clunky, mechanism when we have
> > absolutely no idea what the GPIO provider is or when it will be created.
> > However in the case of reset-gpios, we not only know if the chip is
> > there - we also already hold a reference to its firmware node.
> >
> > In this case using fwnode lookup makes more sense. However, since the
> > reset provider is created dynamically, it doesn't have a corresponding
> > firmware node (in this case: an OF-node). That leaves us with software
> > nodes which currently cannot reference other implementations of the
> > fwnode API, only other struct software_node objects. This is a needless
> > limitation as it's imaginable that a dynamic auxiliary device (with a
> > software node attached) would want to reference a real device with an OF
> > node.
> >
> > This series does three things: extends the software node implementation,
> > allowing its properties to reference not only static software nodes but
> > also existing firmware nodes, updates the GPIO property interface to use
> > the reworked swnode macros and finally makes the reset-gpio code the
> > first user by converting the GPIO lookup from machine to swnode.
> >
> > Another user of the software node changes in the future could become the
> > shared GPIO modules that's in the works in parallel[1].
> >
> > Merging strategy: the series is logically split into three parts: driver
> > core, GPIO and reset respectively. However there are build-time
> > dependencies between all three parts so I suggest the reset tree as the
> > right one to take it upstream with an immutable branch provided to
> > driver core and GPIO.
>
> Should that branch include the reset changes, or only up to patch 6?
>

I was thinking about it containing the entire series, somewhat similar
to what Lee Jones does with MFD changes.

Bartosz