linux-kernel - Re: [alsa-devel] [PATCH 1/2] ASoC: rt5677: Add ACPI device probing

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Date:	Tue, 25 Nov 2014 14:28:06 +0000
From:	Liam Girdwood <liam.r.girdwood@...ux.intel.com>
To:	Grant Likely <grant.likely@...retlab.ca>
Cc:	Ben Zhang <benzh@...omium.org>,
	Oder Chiou <oder_chiou@...ltek.com>,
	alsa-devel <alsa-devel@...a-project.org>,
	Darren Hart <dvhart@...ux.intel.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Liam Girdwood <lgirdwood@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Anatol Pomozov <anatol@...gle.com>,
	Bard Liao <bardliao@...ltek.com>,
	Dylan Reid <dgreid@...omium.org>, flove@...ltek.com
Subject: Re: [alsa-devel] [PATCH 1/2] ASoC: rt5677: Add ACPI device probing

On Tue, 2014-11-25 at 12:11 +0000, Grant Likely wrote:
> On Sat, Nov 15, 2014 at 6:56 AM, Ben Zhang <benzh@...omium.org> wrote:
> > The rt5677 codec driver looks for ACPI device ID "RT5677CE",
> > which is specified in coreboot. This patch allows platform
> > data to be obtained via ACPI
> >
> > Signed-off-by: Ben Zhang <benzh@...omium.org>
> 
> This looks like an ideal time to talk about shared DT and ACPI driver
> bindings. This driver /already/ has a firmware binding. It is
> documented in the kernel under
> Documentation/bindings/sound/rt5677.txt. We now have a standard method
> for sharing bindings between DT and ACPI in the _DSD method[1].
> Support for DSD is in linux-next and getting merged into v3.19. This
> is exactly the case that _DSD should be used for passing additional
> data to the driver, and it should use the existing binding.
> 
> [1] http://www.uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf
> 
> For a long time we've had the rule on DT that new bindings must be
> documented before we merge a patch. That rule I think has been a good
> one, even if it is a little chaoitc. I think when it comes to ACPI
> drivers that we should be requiring the same: Document the binding,
> either in the kernel as a DT binding, or point to somewhere else that
> has the binding documented.
> 
> Also, since this patch is targeted at v3.19 or later, the
> device-properties API should be used. Don't create something custom.
> 

My sentiments exactly, there would be little point having bespoke device
properties for every single device. Btw, we also need to align here with
Windows too !

Liam


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