From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mika Westerberg <mika.westerberg@linux.intel.com>
Subject: Re: [RFC 00/15] ACPI graph support
Date: Thu, 6 Oct 2016 12:11:33 +0300
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To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>, Sakari Ailus <sakari.ailus@linux.intel.com>, ACPI Devel Maling List <linux-acpi@vger.kernel.org>, Mark Rutland <mark.rutland@arm.com>, Mark Brown <broonie@kernel.org>, Rob Herring <robh@kernel.org>, Al Stone <ahs3@redhat.com>

On Thu, Oct 06, 2016 at 09:57:03AM +0100, Lorenzo Pieralisi wrote:
> I am trying to understand why x86 wants to do this, please understand
> our point of view too, we do not want to block progress we want to
> prevent a mess.

One reason is that we have boards like Joule where developers are
allowed to connect different peripherals using buses such as I2C and SPI
where there is no native enumeration mechanism. This includes camera
sensors and related so there needs to be a way for a developer to
describe this in ACPI. Just as can be done when using ARM and DT.