linux-kernel - Re: [PATCH 3/3] ARM: dts: Enable audio support for Peach-pi board

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Date:	Mon, 16 Jun 2014 09:49:26 -0700
From:	Doug Anderson <dianders@...gle.com>
To:	Tushar Behera <trblinux@...il.com>
Cc:	Tushar Behera <tushar.b@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mike Turquette <mturquette@...aro.org>,
	Tomasz Figa <t.figa@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	Rob Herring <robh+dt@...nel.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Kevin Hilman <khilman@...aro.org>,
	Mark Brown <broonie@...aro.org>
Subject: Re: [PATCH 3/3] ARM: dts: Enable audio support for Peach-pi board

Tushar,

On Mon, Jun 16, 2014 at 4:19 AM, Tushar Behera <trblinux@...il.com> wrote:
> On 06/13/2014 10:33 PM, Doug Anderson wrote:
>> Tushar,
>>
>> On Tue, Jun 10, 2014 at 10:32 PM, Tushar Behera <tushar.b@...sung.com> wrote:
>>> Peach-pi board has MAX98090 audio codec connected on HSI2C-7 bus.
>>
>> If you want to be a stickler about it, peach-pi actually has a
>> max98091.  That requires code changes to the i2c driver, though.
>> ...and unfortunately listing two compatible strings for i2c devices is
>> broken.  :(
>>
> Hi Doug,
>
> You are right. I checked the boot logs, the detected codec type is
> MAX98091. Since both these CODECs are supported through a single driver
> and the detection of chip is done during runtime, I would suggest we go
> ahead with "max98090" compatible string. I will update the commit
> message accordingly.
>
> Does that sound okay to you?

As per my understanding you shouldn't do this.  You should have two patches:

1. Add "max98091".  You could simply post Wonjoon's patch from
<https://chromium-review.googlesource.com/184091>

2. Change the device tree to refer to "max98091"

The argument that the "current kernel driver has a single driver" is
an argument that you're not supposed to make for device tree.  The
same device tree is supposed to work for U-Boot, BSD, or any other
platform.  On those platforms it might not be a shared driver.


> If you so desire, I will submit a patch to sort peach-pi device-tree
> nodes (w.r.t. peach-pit dts file).

Yes please.  I think there's supposed to be some official ordering of
things.  If anyone reading this has a pointer to the official sort
order of things in the device tree I'd love to see it!  ;)

-Doug
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