linux-kernel - Re: [PATCH v2 03/11] ARM: tegra: Set the sound card model that alsaucm expects

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Message-ID: <CAEUnVG4R6NH3EAM9qBaxzC+T26qWeiEm=iZtFQKyrQTcvfzicg@mail.gmail.com>
Date:	Tue, 20 Jan 2015 09:01:34 -0800
From:	Dylan Reid <dgreid@...omium.org>
To:	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Cc:	Stephen Warren <swarren@...dotorg.org>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Simon Glass <sjg@...omium.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 03/11] ARM: tegra: Set the sound card model that
 alsaucm expects

On Mon, Jan 19, 2015 at 9:11 AM, Tomeu Vizoso
<tomeu.vizoso@...labora.com> wrote:
> On 19 January 2015 at 18:10, Stephen Warren <swarren@...dotorg.org> wrote:
>> On 01/16/2015 02:01 AM, Tomeu Vizoso wrote:
>>>
>>> On 16 January 2015 at 09:50, Tomeu Vizoso <tomeu.vizoso@...labora.com>
>>> wrote:
>>>>
>>>> On 15 January 2015 at 18:22, Stephen Warren <swarren@...dotorg.org>
>>>> wrote:
>>>>>
>>>>> On 01/15/2015 09:12 AM, Tomeu Vizoso wrote:
>>>>>>
>>>>>>
>>>>>> Patches are on its way to add a config file to alsaucm for the Nyan
>>>>>> boards. Use the same card ID that alsaucm will expect.
>>>>>>
>>>>>> Signed-off-by: Tomeu Vizoso <tomeu.vizoso@...labora.com>
>>>>>> ---
>>>>>>    arch/arm/boot/dts/tegra124-nyan-big.dts | 4 ++--
>>>>>>    1 file changed, 2 insertions(+), 2 deletions(-)
>>>>>>
>>>>>> diff --git a/arch/arm/boot/dts/tegra124-nyan-big.dts
>>>>>> b/arch/arm/boot/dts/tegra124-nyan-big.dts
>>>>>> index 43e58a4..9a9cffe 100644
>>>>>> --- a/arch/arm/boot/dts/tegra124-nyan-big.dts
>>>>>> +++ b/arch/arm/boot/dts/tegra124-nyan-big.dts
>>>>>> @@ -1976,9 +1976,9 @@
>>>>>>          };
>>>>>>
>>>>>>          sound {
>>>>>> -               compatible = "nvidia,tegra-audio-max98090-nyan-big",
>>>>>> +               compatible = "nvidia,tegra-audio-max98090-nyan",
>>>>>>                               "nvidia,tegra-audio-max98090";
>>>>>
>>>>>
>>>>>
>>>>> If all the boards that are derived from Nyan truly have identical audio
>>>>> HW
>>>>> (or at least any differences can be described by this binding), then it
>>>>> seems fine to add "nvidia,tegra-audio-max98090-nyan" to the compatible
>>>>> value.
>>>>
>>>>
>>>>
>>>>
>>>>> However, I don't see a reason to remove the board-specific compatible
>>>>> value
>>>>> "nvidia,tegra-audio-max98090-nyan-big"; we should always include all the
>>>>> values that are relevant.
>>>>
>>>>
>>>> Ok.
>>>
>>>
>>> Oh, actually, my intention was to move the whole sound node to the
>>> nyan dtsi, as there isn't anything specific to the blaze regarding
>>> sound.
>>
>>
>> There are zero differences between the sound circuits of the boards? If so,
>> that sounds fine. I suppose if we do need to apply a quirk to one board but
>> not the other, we can always fall back on the top-level compatible value if
>> we absolutely have to.
>
> Yeah, this is what Dylan said in other thread:
>
> "ChromeOS uses one config for both.  The only audio difference between
> these two boards is the speakers, that isn't represented in UCM, so
> one config file is fine."

Correct, they share the same headset chip and codec, they are both
wired up the same.

>
> Regards,
>
> Tomeu
>
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