linux-kernel - Re: [PATCH] ASoC: fsl: add imx-cs427x machine driver

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Date:	Tue, 26 Jan 2016 09:50:46 -0600
From:	Rob Herring <robh@...nel.org>
To:	Felipe Ferreri Tonello <eu@...ipetonello.com>
Cc:	Linux-ALSA <alsa-devel@...a-project.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Takashi Iwai <tiwai@...e.com>
Subject: Re: [PATCH] ASoC: fsl: add imx-cs427x machine driver

On Tue, Jan 26, 2016 at 3:43 AM, Felipe Ferreri Tonello
<eu@...ipetonello.com> wrote:
> Hi Rob,
>
> On 26/01/16 02:29, Rob Herring wrote:
>> On Mon, Jan 25, 2016 at 05:53:23PM +0000, Felipe F. Tonello wrote:
>>> This is the initial imx-cs427x device-tree-only machine driver working with
>>> fsl_ssi driver. More features can be added on top of it later.
>>>
>>> Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
>>> ---
>>>  .../devicetree/bindings/sound/imx-audio-cs427x.txt |  47 +++++
>>>  sound/soc/fsl/Kconfig                              |  12 ++
>>>  sound/soc/fsl/Makefile                             |   2 +
>>>  sound/soc/fsl/imx-cs427x.c                         | 218 +++++++++++++++++++++
>>>  4 files changed, 279 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/sound/imx-audio-cs427x.txt
>>>  create mode 100644 sound/soc/fsl/imx-cs427x.c
>>>
>>> diff --git a/Documentation/devicetree/bindings/sound/imx-audio-cs427x.txt b/Documentation/devicetree/bindings/sound/imx-audio-cs427x.txt
>>> new file mode 100644
>>> index 000000000000..295f60b19418
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/sound/imx-audio-cs427x.txt
>>> @@ -0,0 +1,47 @@
>>> +Freescale i.MX audio complex with CS4271 or CS4272 codec
>>
>> Do all the i.MX audio bindings really vary more that the codec? Seems
>> like a lot of duplication.
>
> I agree, but that how it is today. These platform drivers for imx are
> similar but not identical. Looking at them I would guess that they have
> 50 to 60% of duplicated code.
>
> I believe we can add this driver and work on re-using the code on a
> future series of patches.
>
>>
>>> +
>>> +Required properties:
>>> +
>>> +  - compatible              : "fsl,imx-audio-cs427x"
>>> +
>>> +  - model           : The user-visible name of this sound complex
>>> +
>>> +  - ssi-controller  : The phandle of the i.MX SSI controller
>>> +
>>> +  - audio-codec     : The phandle of the CS4271 audio codec
>>> +
>>> +  - audio-routing   : A list of the connections between audio components.
>>> +                      Each entry is a pair of strings, the first being the
>>> +                      connection's sink, the second being the connection's
>>> +                      source. Valid names could be power supplies, CS427x
>>> +                      pins, and the jacks on the board:
>>> +
>>> +                      Board connectors:
>>> +                       * Mic Jack
>>> +                       * Headphone Jack
>>
>> This should be an exact list of possible strings and valid combinations.
>
> This is the exact list for this version of this driver. At least that is
> what I can verify on my hardware (custom build).

What are AINA, AINB, etc. then?

Also, model should have its string documented. I should be able to
write the example from the documentation.

Rob