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

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Date:	Tue, 26 Jan 2016 09:43:58 +0000
From:	Felipe Ferreri Tonello <eu@...ipetonello.com>
To:	Rob Herring <robh@...nel.org>
Cc:	alsa-devel@...a-project.org, linux-kernel@...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

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).

> 
>> +  - mux-int-port	: The internal port of the i.MX audio muxer (AUDMUX)
>> +
>> +  - mux-ext-port	: The external port of the i.MX audio muxer
>> +
>> +Note: The AUDMUX port numbering should start at 1, which is consistent with
>> +hardware manual.
>> +
>> +Example:
>> +
>> +sound {
>> +	compatible = "fsl,imx6-rex-cs427x",
>> +		"fsl,imx-audio-cs427x";
>> +	model = "audio-cs427x";
>> +	ssi-controller = <&ssi1>;
>> +	audio-codec = <&cs4271>;
>> +	audio-routing =
>> +		"Mic Jack", "AINA",
>> +		"Mic Jack", "AINB",
>> +		"Headphone Jack", "AOUTA+",
>> +		"Headphone Jack", "AOUTA-",
>> +		"Headphone Jack", "AOUTB+",
>> +		"Headphone Jack", "AOUTB-";
>> +	mux-int-port = <1>;
>> +	mux-ext-port = <3>;
>> +};

Felipe

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