Re: [PATCH v5 5/6] dt-bindings: display: Add Synaptics R63455 panel support

[Linus Walleij]

On Wed, Sep 30, 2026 at 6:43 PM Neil Armstrong
<neil.armstrong@xxxxxxxxxx> wrote:
> On 9/30/26 09:44, Linus Walleij wrote:
> > On Tue, Sep 29, 2026 at 3:35 PM Krzysztof Kozlowski <krzk@xxxxxxxxxx> wrote:

> > The current binding does not reflect the physical topology of the
> > actual device, and the bindings need improvements. I have a feeling
> > there is one display controller with two physical panels.
>
> No there's really 2 controller and 2 separate panels, but they are not
> classic panel, they are a pair of panels+lens which are in front of
> the eyes which forms a single "image" for the brain, so they are
> technically a single display and requires to be hard synchronized.

OK

> See it like a single physical panel with 2 controllers which
> shouldn't be used separately.

If you have one reset line to them each, and as proven
by the driver in this series also grab and assert both, they
are by definition *already* used separately.

DT needs to describe the hardware.

Defining two nodes below the main node for the two
controllers and adding a reset line to each describes the
hardware perfectly fine?

It's not like I don't understand that this will complicate things
on the drivers side, of course it does. But a binding is a binding
is a binding. It needs to describe the hardware.

Yours,
Linus Walleij