Re: [PATCH] dt-bindings: usb: usb-device: Add panel-location

Rob Herring
2024-12-19T12:24:55Z

On Tue, Dec 17, 2024 at 04:24:27PM +0100, Ricardo Ribalda wrote:
> Hi Rob
>
> On Tue, 17 Dec 2024 at 16:02, Rob Herring <robh@kernel.org> wrote:
> >
> > On Thu, Dec 12, 2024 at 09:44:37PM +0000, Ricardo Ribalda wrote:
> > > For some devices like cameras the system needs to know where they are
> > > mounted.
> >
> > Why do you need this and why only this property and not the dozens
> > others ACPI has?
>
> Userspace needs that information to correctly show it in the UI. Eg;
>
> - User facing camera needs to be mirrored during preview.
> - The user facing camera is selected by default during videoconferences
> - The world facing camera is selected by default when taking a photo
> - User facing camera have different parameter defaults than world facing.

We already have "orientation" defined for this purpose.

>
> Right now, the only camera driver that expose the ACPI location
> information is the IPU from intel
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/media/pci/intel/ipu-bridge.c#n258
>
> And they are only using the panel.
>
> If we need more information we can consider adding more parameters in
> the future.