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Date:   Tue, 13 Feb 2018 17:12:44 -0600
From:   Rob Herring <robh@...nel.org>
To:     srinivas.kandagatla@...aro.org
Cc:     andy.gross@...aro.org, broonie@...nel.org,
        linux-arm-msm@...r.kernel.org, alsa-devel@...a-project.org,
        david.brown@...aro.org, mark.rutland@....com, lgirdwood@...il.com,
        plai@...eaurora.org, bgoswami@...eaurora.org, perex@...ex.cz,
        tiwai@...e.com, linux-soc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, rohkumar@....qualcomm.com,
        spatakok@....qualcomm.com
Subject: Re: [PATCH v3 01/25] dt-bindings: soc: qcom: Add bindings for APR bus

On Tue, Feb 13, 2018 at 04:58:13PM +0000, srinivas.kandagatla@...aro.org wrote:
> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> 
> This patch add dt bindings for Qualcomm APR (Asynchronous Packet Router)
> bus driver. This bus is used for communicating with DSP which provides
> audio and various other services to cpu.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  .../devicetree/bindings/soc/qcom/qcom,apr.txt      | 83 ++++++++++++++++++++++
>  1 file changed, 83 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> new file mode 100644
> index 000000000000..1b95fbfed348
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> @@ -0,0 +1,83 @@
> +Qualcomm APR (Asynchronous Packet Router) binding
> +
> +This binding describes the Qualcomm APR. APR is a IPC protocol for
> +communication between Application processor and QDSP. APR is mainly
> +used for audio/voice services on the QDSP.
> +
> +- compatible:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: must be "qcom,apr-v<VERSION-NUMBER>", example "qcom,apr-v2"
> +
> +- qcom,apr-dest-domain-id
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: Destination processor ID.
> +	Possible values are :
> +			1 - APR simulator
> +			2 - PC
> +			3 - MODEM
> +			4 - ADSP
> +			5 - APPS
> +			6 - MODEM2
> +			7 - APPS2
> +
> += APR SERVICES
> +Each subnode of the APR node can represent service tied to this apr. The name
> +of the nodes are not important. The properties of these nodes are defined
> +by the individual bindings for the specific service
> +- but must contain the following property:
> +
> +- qcom,apr-svc-id
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: APR Service ID, used for matching the service.
> +	Possible values are :
> +			3 - DSP Core Service
> +			4 - Audio Front End Service.
> +			5 - Voice Stream Manager Service.
> +			6 - Voice processing manager.
> +			7 - Audio Stream Manager Service.
> +			8 - Audio Device Manager Service.
> +			9 - Multimode voice manager.
> +			10 - Core voice stream.
> +			11 - Core voice processor.
> +			12 - Ultrasound stream manager.
> +			13 - Listen stream manager.
> +
> +- qcom,apr-svc-name
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: User readable name of a APR service.
> +
> += APR DEVICES:
> +Each subnode of the APR node can represent devices tied to this apr, like
> +sound-card. The properties of these nodes are defined by the individual
> +bindings for the specific device.

It's not a good design generally to mix different types of nodes at one 
level.

> +
> += EXAMPLE
> +The following example represents a QDSP based sound card on a MSM8996 device
> +which uses apr as communication between Apps and QDSP.
> +
> +	apr {
> +		compatible = "qcom,apr-v2";
> +		qcom,smd-channels = "apr_audio_svc";
> +		qcom,apr-dest-domain-id = <APR_DOMAIN_ADSP>;
> +
> +		q6core {
> +			compatible = "qcom,q6core";
> +			qcom,apr-svc-name = "CORE";
> +			qcom,apr-svc-id = <APR_SVC_ADSP_CORE>;
> +		};
> +
> +		q6afe {
> +			compatible = "qcom,q6afe";
> +			qcom,apr-svc-name = "AFE";
> +			qcom,apr-svc-id = <APR_SVC_AFE>;
> +		};
> +
> +		audio {
> +			compatible = "qcom,msm8996-snd-card";
> +			...
> +		};
> +	};
> -- 
> 2.15.1
> 

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