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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241219122453.GA4008177-robh@kernel.org>
Date: Thu, 19 Dec 2024 06:24:53 -0600
From: Rob Herring <robh@...nel.org>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: 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>,
	Sakari Ailus <sakari.ailus@...ux.intel.com>,
	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

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.

> 
> 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.