linux-kernel - Re: [PATCH v5 01/23] soc: qcom dt-bindings: Add APR bus bindings

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Date:   Tue, 24 Apr 2018 10:52:26 -0500
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,
        gregkh@...uxfoundation.org, david.brown@...aro.org,
        mark.rutland@....com, lgirdwood@...il.com, plai@...eaurora.org,
        bgoswami@...eaurora.org, tiwai@...e.com, perex@...ex.cz,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, rohkumar@....qualcomm.com,
        spatakok@....qualcomm.com
Subject: Re: [PATCH v5 01/23] soc: qcom dt-bindings: Add APR bus bindings

On Wed, Apr 18, 2018 at 04:31:35PM +0100, 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      | 85 ++++++++++++++++++++++

This should probably go under bindings/sound/ as it is at least mostly 
sound related.

>  include/dt-bindings/soc/qcom,apr.h                 | 27 +++++++
>  2 files changed, 112 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
>  create mode 100644 include/dt-bindings/soc/qcom,apr.h
> 
> 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..85cc0433fb00
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,apr.txt
> @@ -0,0 +1,85 @@
> +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,dest-domain-id
> +	Usage: required
> +	Value type: <prop-encoded-array>

If this is an array, what do the indexes of the array correspond to?

> +	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 represents 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
> +- All APR services MUST contain the following property:
> +
> +- reg
> +	Usage: required
> +	Value type: <prop-encoded-array>

Not really an array, right?

> +	Definition: APR Service ID
> +	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.
> +
> += 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";

Drop this?

> +		qcom,dest-domain-id = <APR_DOMAIN_ADSP>;
> +
> +		q6core {
> +			compatible = "qcom,q6core";
> +			reg = <APR_SVC_ADSP_CORE>;
> +		};
> +
> +		q6afe {
> +			compatible = "qcom,q6afe";
> +			reg = <APR_SVC_AFE>;
> +
> +			dais {
> +				#sound-dai-cells = <1>;
> +				hdmi@1 {
> +					reg = <1>;
> +				};
> +			};
> +		};
> +
> +		q6asm {
> +			compatible = "qcom,q6asm";
> +			reg = <APR_SVC_ASM>;
> +			...
> +		};
> +
> +		q6adm {
> +			compatible = "qcom,q6adm";
> +			reg = <APR_SVC_ADM>;
> +			...
> +		};
> +	};
> diff --git a/include/dt-bindings/soc/qcom,apr.h b/include/dt-bindings/soc/qcom,apr.h
> new file mode 100644
> index 000000000000..905503f81885
> --- /dev/null
> +++ b/include/dt-bindings/soc/qcom,apr.h
> @@ -0,0 +1,27 @@
> +#ifndef __DT_BINDINGS_QCOM_APR_H
> +#define __DT_BINDINGS_QCOM_APR_H
> +
> +/* Domain IDs */
> +#define APR_DOMAIN_SIM		0x1
> +#define APR_DOMAIN_PC		0x2
> +#define APR_DOMAIN_MODEM	0x3
> +#define APR_DOMAIN_ADSP		0x4
> +#define APR_DOMAIN_APPS		0x5
> +#define APR_DOMAIN_MAX		0x6
> +
> +/* ADSP service IDs */
> +#define APR_SVC_ADSP_CORE	0x3
> +#define APR_SVC_AFE		0x4
> +#define APR_SVC_VSM		0x5
> +#define APR_SVC_VPM		0x6
> +#define APR_SVC_ASM		0x7
> +#define APR_SVC_ADM		0x8
> +#define APR_SVC_ADSP_MVM	0x09
> +#define APR_SVC_ADSP_CVS	0x0A
> +#define APR_SVC_ADSP_CVP	0x0B
> +#define APR_SVC_USM		0x0C
> +#define APR_SVC_LSM		0x0D
> +#define APR_SVC_VIDC		0x16
> +#define APR_SVC_MAX		0x17
> +
> +#endif /* __DT_BINDINGS_QCOM_APR_H */
> -- 
> 2.16.2
>