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

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Message-ID: <Z2QRsMWX-f6Ya74j@kekkonen.localdomain>
Date: Thu, 19 Dec 2024 12:29:36 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Rob Herring <robh@...nel.org>
Cc: Ricardo Ribalda <ribalda@...omium.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Jacopo Mondi <jacopo@...ndi.org>, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: usb: usb-device: Add panel-location

Hello,

On Thu, Dec 19, 2024 at 06:24:53AM -0600, Rob Herring wrote:
> 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@...nel.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.

I was thinking of the same. It's defined (for cameras) in
Documentation/devicetree/bindings/media/video-interface-devices.yaml .

> 
> > 
> > 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.

-- 
Regards,

Sakari Ailus