From: Mika Westerberg <mika.westerberg@linux.intel.com>
To: Mark Brown <broonie@kernel.org>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
"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>,
Rob Herring <robh@kernel.org>, Al Stone <ahs3@redhat.com>
Subject: Re: [RFC 00/15] ACPI graph support
Date: Thu, 6 Oct 2016 15:26:59 +0300 [thread overview]
Message-ID: <20161006122659.GJ30800@lahna.fi.intel.com> (raw)
In-Reply-To: <20161006104058.uqdkv3pfihicxyfv@sirena.org.uk>
On Thu, Oct 06, 2016 at 12:40:58PM +0200, Mark Brown wrote:
> On Thu, Oct 06, 2016 at 12:11:33PM +0300, Mika Westerberg wrote:
>
> > 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.
>
> One of my biggest concerns with this approach is that I'm really not
> clear to me that that this has broad buy in from the x86/ACPI community
> and therefore that we might end up needing to support several different
> styles of ACPI bindings. Reuse would be great but it can be confusing
> if there's multiple different styles of bindings in use at the same
> time.
Yes, that's possible unfortunately. And we can't force people to use
whatever _DSD properties we came up. Instead they use whatever is
convenient for them, even if it is already available in the _DSD
properties database.
> The audio systems that have this issue (which include production laptops
> and tablets with both Windows and ChromeOS) don't seem to be showing
> much interest in reusing any of the DT work beyond the device level
> properties and I didn't think the OS level support for using _DSD in
> Windows was great. There were also the pinctrl bindings which had some
> issues too.
Right and it does not always follow DT work even on device level.
Here is an example what Windows is supporting. They use _DSD device
properties but it is completely different to what Linux and DT use:
https://msdn.microsoft.com/en-us/windows/uwp/devices-sensors/enable-usermode-access
We have had all that stuff in DT already but they chose not to use it.
next prev parent reply other threads:[~2016-10-06 12:31 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-04 22:45 [RFC 00/15] ACPI graph support Sakari Ailus
2016-10-04 22:45 ` [RFC 01/15] ACPI / property: Add possiblity to retrieve parent firmware node Sakari Ailus
2016-10-04 22:45 ` [RFC 02/15] device property: Add fwnode_get_parent() Sakari Ailus
2016-10-04 22:45 ` [RFC 03/15] ACPI / property: Add fwnode_get_next_child_node() Sakari Ailus
2016-10-04 22:45 ` [RFC 04/15] device property: Add fwnode_get_named_child_node() Sakari Ailus
2016-10-04 22:45 ` [RFC 05/15] ACPI / property: Add support for remote endpoints Sakari Ailus
2016-10-04 22:45 ` [RFC 06/15] device " Sakari Ailus
2016-10-04 22:45 ` [RFC 07/15] device property: Add fwnode_handle_get() Sakari Ailus
2016-10-04 22:45 ` [RFC 08/15] of: Add of_fwnode_handle() to convert device nodes to fwnode_handle Sakari Ailus
2016-10-04 22:45 ` [RFC 09/15] driver core: Arrange headers alphabetically Sakari Ailus
2016-10-04 22:45 ` [RFC 10/15] of: No need to include property.h, fwnode.h is sufficient Sakari Ailus
2016-10-04 22:45 ` [RFC 11/15] device property: Obtain device's fwnode independently of FW type Sakari Ailus
2016-10-04 22:45 ` [RFC 12/15] device property: Add support for fwnode endpoints Sakari Ailus
2016-10-04 22:45 ` [RFC 13/15] of: Add nop implementation of of_get_next_parent() Sakari Ailus
2016-10-04 22:45 ` [RFC 14/15] device property: Add fwnode_get_next_parent() Sakari Ailus
2016-10-04 22:45 ` [RFC 15/15] ACPI / DSD: Document references, ports and endpoints Sakari Ailus
2016-10-05 9:22 ` [RFC 00/15] ACPI graph support Lorenzo Pieralisi
2016-10-05 11:41 ` Mika Westerberg
2016-10-05 15:06 ` Lorenzo Pieralisi
2016-10-05 15:32 ` Mika Westerberg
2016-10-05 16:18 ` Lorenzo Pieralisi
2016-10-05 20:33 ` Rafael J. Wysocki
2016-10-06 8:57 ` Lorenzo Pieralisi
2016-10-06 9:11 ` Mika Westerberg
2016-10-06 9:57 ` Lorenzo Pieralisi
2016-10-06 11:19 ` Mika Westerberg
2016-10-06 15:31 ` Mark Brown
2016-10-06 16:00 ` Rafael J. Wysocki
2016-10-06 16:14 ` Mark Brown
2016-10-06 17:02 ` Rafael J. Wysocki
2016-10-11 12:44 ` Mark Rutland
2016-10-12 0:19 ` Rafael J. Wysocki
2016-10-06 12:30 ` Rafael J. Wysocki
2016-10-06 10:40 ` Mark Brown
2016-10-06 12:26 ` Mika Westerberg [this message]
2016-10-06 13:15 ` Rafael J. Wysocki
2016-10-06 15:23 ` Mark Brown
2016-10-06 15:56 ` Rafael J. Wysocki
2016-10-06 15:57 ` Sudeep Holla
2016-10-06 12:26 ` Rafael J. Wysocki
2016-10-06 21:37 ` Mark Brown
2016-10-10 23:44 ` Rafael J. Wysocki
2016-10-11 12:11 ` Rafael J. Wysocki
2016-10-11 13:05 ` Mark Brown
2016-10-11 12:44 ` Mark Brown
2016-10-11 13:32 ` Mark Rutland
2016-10-12 0:32 ` Rafael J. Wysocki
2016-10-12 12:05 ` Mark Brown
2016-10-12 12:26 ` Rafael J. Wysocki
2016-10-11 13:01 ` Mark Rutland
2016-10-11 13:26 ` Mark Brown
2016-10-11 12:56 ` Mark Rutland
2016-10-06 22:02 ` Sakari Ailus
2016-10-11 12:35 ` Mark Rutland
2016-10-12 9:00 ` Mika Westerberg
2016-10-12 10:28 ` Mark Brown
2016-10-12 11:12 ` Mika Westerberg
2016-10-12 11:25 ` Rafael J. Wysocki
2016-10-12 16:00 ` Mark Brown
2016-10-12 11:14 ` Rafael J. Wysocki
2016-10-12 12:32 ` Mark Brown
2016-10-12 12:42 ` Rafael J. Wysocki
2016-10-12 14:59 ` Mark Brown
2016-10-12 17:50 ` Rafael J. Wysocki
2016-10-06 21:58 ` Sakari Ailus
2016-10-05 15:21 ` Mark Brown
2016-10-05 15:30 ` Sudeep Holla
2016-10-05 18:14 ` Mika Westerberg
2016-10-05 20:18 ` Rafael J. Wysocki
2016-10-06 10:29 ` Sudeep Holla
2016-10-06 13:04 ` Rafael J. Wysocki
2016-10-06 14:20 ` Sudeep Holla
2016-10-06 17:05 ` Rafael J. Wysocki
2016-10-06 17:20 ` Sudeep Holla
2016-10-11 0:05 ` Rafael J. Wysocki
2016-10-11 8:57 ` Sudeep Holla
2016-10-11 11:59 ` Rafael J. Wysocki
2016-10-11 13:15 ` Mark Brown
2016-10-12 0:35 ` Rafael J. Wysocki
2016-10-06 17:20 ` Al Stone
2016-10-06 20:14 ` Mark Brown
2016-10-06 20:54 ` Al Stone
2016-10-11 12:28 ` Mark Rutland
2016-10-12 1:18 ` Rafael J. Wysocki
2016-10-06 21:10 ` Sakari Ailus
2016-10-11 13:30 ` Mark Rutland
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