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Date:   Fri, 10 Sep 2021 16:43:50 -0500
From:   Rob Herring <robh@kernel.org>
To:     Shengjiu Wang <shengjiu.wang@nxp.com>
Cc:     ohad@wizery.com, bjorn.andersson@linaro.org,
        mathieu.poirier@linaro.org, shawnguo@kernel.org,
        s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com,
        daniel.baluta@nxp.com, linux-imx@nxp.com,
        linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        shengjiu.wang@gmail.com
Subject: Re: [PATCH v4 4/4] dt-bindings: dsp: fsl: update binding document
 for remote proc driver
Message-ID: <YTvRlmIedfBiXSCg@robh.at.kernel.org>
References: <1631092255-25150-1-git-send-email-shengjiu.wang@nxp.com>
 <1631092255-25150-5-git-send-email-shengjiu.wang@nxp.com>
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On Wed, Sep 08, 2021 at 05:10:55PM +0800, Shengjiu Wang wrote:
> As there are two drivers for DSP on i.MX, one is for sound open
> firmware, another is for remote processor framework. In order to
> distinguish two kinds of driver, defining different compatible strings.

What determines which firmware is used? Is it tied to the board? Or for 
a given board, users could want different firmware? In the latter case, 
this configuration should not be in DT.

> For remote proc driver, the properties firmware-name and fsl,dsp-ctrl
> are needed and the mailbox channel is different with SOF.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> ---
>  .../devicetree/bindings/dsp/fsl,dsp.yaml      | 81 +++++++++++++++++--
>  1 file changed, 75 insertions(+), 6 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml b/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
> index 7afc9f2be13a..51ea657f6d42 100644
> --- a/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
> +++ b/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
> @@ -8,6 +8,7 @@ title: NXP i.MX8 DSP core
>  
>  maintainers:
>    - Daniel Baluta <daniel.baluta@nxp.com>
> +  - Shengjiu Wang <shengjiu.wang@nxp.com>
>  
>  description: |
>    Some boards from i.MX8 family contain a DSP core used for
> @@ -19,6 +20,10 @@ properties:
>        - fsl,imx8qxp-dsp
>        - fsl,imx8qm-dsp
>        - fsl,imx8mp-dsp
> +      - fsl,imx8qxp-hifi4
> +      - fsl,imx8qm-hifi4
> +      - fsl,imx8mp-hifi4
> +      - fsl,imx8ulp-hifi4
>  
>    reg:
>      maxItems: 1
> @@ -28,37 +33,63 @@ properties:
>        - description: ipg clock
>        - description: ocram clock
>        - description: core clock
> +      - description: debug interface clock
> +      - description: message unit clock
> +    minItems: 3
> +    maxItems: 5
>  
>    clock-names:
>      items:
>        - const: ipg
>        - const: ocram
>        - const: core
> +      - const: debug
> +      - const: mu
> +    minItems: 3
> +    maxItems: 5
>  
>    power-domains:
>      description:
>        List of phandle and PM domain specifier as documented in
>        Documentation/devicetree/bindings/power/power_domain.txt
> +    minItems: 1
>      maxItems: 4

How does the same h/w have different number of power domains?

>  
>    mboxes:
>      description:
>        List of <&phandle type channel> - 2 channels for TXDB, 2 channels for RXDB
> +      or - 1 channel for TX, 1 channel for RX, 1 channel for RXDB
>        (see mailbox/fsl,mu.txt)
> +    minItems: 3
>      maxItems: 4
>  
>    mbox-names:
> -    items:
> -      - const: txdb0
> -      - const: txdb1
> -      - const: rxdb0
> -      - const: rxdb1
> +    oneOf:
> +      - items:
> +          - const: txdb0
> +          - const: txdb1
> +          - const: rxdb0
> +          - const: rxdb1
> +      - items:
> +          - const: tx
> +          - const: rx
> +          - const: rxdb

These are completely different mailboxes?

>  
>    memory-region:
>      description:
>        phandle to a node describing reserved memory (System RAM memory)
>        used by DSP (see bindings/reserved-memory/reserved-memory.txt)
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 4
> +
> +  firmware-name:
> +    description: |
> +      Default name of the firmware to load to the remote processor.
> +
> +  fsl,dsp-ctrl:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to syscon block which provide access for processor enablement

Curious, how is this done with the open sound f/w?

>  
>  required:
>    - compatible
> @@ -91,3 +122,41 @@ examples:
>          mboxes = <&lsio_mu13 2 0>, <&lsio_mu13 2 1>, <&lsio_mu13 3 0>, <&lsio_mu13 3 1>;
>          memory-region = <&dsp_reserved>;
>      };
> +  - |
> +    #include <dt-bindings/clock/imx8mp-clock.h>
> +    dsp_reserved: dsp@92400000 {
> +      reg = <0x92400000 0x1000000>;
> +      no-map;
> +    };
> +    dsp_vdev0vring0: vdev0vring0@942f0000 {
> +      reg = <0x942f0000 0x8000>;
> +      no-map;
> +    };
> +    dsp_vdev0vring1: vdev0vring1@942f8000 {
> +      reg = <0x942f8000 0x8000>;
> +      no-map;
> +    };
> +    dsp_vdev0buffer: vdev0buffer@94300000 {
> +      compatible = "shared-dma-pool";
> +      reg = <0x94300000 0x100000>;
> +      no-map;
> +    };
> +
> +    dsp: dsp@3b6e8000 {
> +      compatible = "fsl,imx8mp-hifi4";
> +      reg = <0x3B6E8000 0x88000>;
> +      clocks = <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_DSP_ROOT>,
> +               <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_OCRAMA_IPG>,
> +               <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_DSP_ROOT>,
> +               <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_DSPDBG_ROOT>;
> +      clock-names = "ipg", "ocram", "core", "debug";
> +      firmware-name = "imx/dsp/hifi4.bin";
> +      power-domains = <&audiomix_pd>;
> +      mbox-names = "tx", "rx", "rxdb";
> +      mboxes = <&mu2 0 0>,
> +               <&mu2 1 0>,
> +               <&mu2 3 0>;
> +      memory-region = <&dsp_vdev0buffer>, <&dsp_vdev0vring0>,
> +                      <&dsp_vdev0vring1>, <&dsp_reserved>;
> +      fsl,dsp-ctrl = <&audio_blk_ctrl>;
> +    };
> -- 
> 2.17.1
> 
>