linux-kernel - Re: [PATCH 1/2] dt-bindings: remoteproc: Add fsl,imx-dsp-rproc binding document

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Message-ID: <YSAQgywy8UW540h9@robh.at.kernel.org>
Date:   Fri, 20 Aug 2021 15:28:51 -0500
From:   Rob Herring <robh@...nel.org>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     ohad@...ery.com, bjorn.andersson@...aro.org,
        mathieu.poirier@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, shengjiu.wang@...il.com
Subject: Re: [PATCH 1/2] dt-bindings: remoteproc: Add fsl,imx-dsp-rproc
 binding document

On Fri, Aug 20, 2021 at 06:03:10PM +0800, Shengjiu Wang wrote:
> Define the compatible string and properties needed by imx_dsp_rproc
> driver.
> 
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
>  .../remoteproc/fsl,imx-dsp-rproc.yaml         | 123 ++++++++++++++++++
>  1 file changed, 123 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/remoteproc/fsl,imx-dsp-rproc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/fsl,imx-dsp-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/fsl,imx-dsp-rproc.yaml
> new file mode 100644
> index 000000000000..7eba49aa959e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/fsl,imx-dsp-rproc.yaml
> @@ -0,0 +1,123 @@
> +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/remoteproc/fsl,imx-dsp-rproc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: i.MX DSP Remoteproc Devices
> +
> +maintainers:
> +  - Shengjiu Wang <shengjiu.wang@....com>
> +
> +description:
> +  This binding provides support for DSP processors found on i.mX family of SoCs
> +
> +properties:
> +  compatible:
> +    enum:
> +      - fsl,imx8qxp-hifi4
> +      - fsl,imx8qm-hifi4
> +      - fsl,imx8mp-hifi4
> +      - fsl,imx8ulp-hifi4
> +
> +  clocks:
> +    description: |
> +      Main functional clock for the remote processor

Don't need '|' if no formatting. 

> +    minItems: 1
> +    maxItems: 32
> +
> +  clock-names:
> +    description:
> +      List of clock names for the remote processor.
> +      dsp_clkx for clocks of dsp itself.
> +      per_clkx for clocks of peripherals used by dsp.

Sounds like constraints that should be a schema. But this looks like 
some random collection of clocks, not clocks for the DSP h/w.

> +    minItems: 1
> +    maxItems: 32
> +
> +  syscon:

Vendor prefix and name it based on what it points to or is used for.

> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description:
> +      Phandle to syscon block which provide access for processor enablement
> +
> +  mbox-names:
> +    items:
> +      - const: tx
> +      - const: rx
> +      - const: rxdb
> +
> +  mboxes:
> +    description:
> +      This property is required only if the rpmsg/virtio functionality is used.
> +      List of <&phandle type channel> - 1 channel for TX, 1 channel for RX, 1 channel for RXDB.
> +      (see mailbox/fsl,mu.yaml)
> +    minItems: 1
> +    maxItems: 3
> +
> +  firmware-name:
> +    description: |
> +      Default name of the firmware to load to the remote processor.
> +
> +  memory-region:
> +    description:
> +      If present, a phandle for a reserved memory area that used for vdev buffer,
> +      resource table, vring region and others used by remote processor.
> +    minItems: 1
> +    maxItems: 32
> +
> +  reg:
> +    description: |
> +      Address space for any remoteproc memories present on the SoC.
> +
> +  power-domains:
> +    minItems: 1
> +    maxItems: 32
> +
> +required:
> +  - compatible
> +  - reg
> +  - mboxes
> +  - mbox-names
> +  - clocks
> +  - clock-names
> +  - firmware-name
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/clock/imx8mp-clock.h>
> +    dsp_reserved: dsp@...00000 {
> +      reg = <0x92400000 0x1000000>;
> +      no-map;
> +    };
> +    dsp_vdev0vring0: vdev0vring0@...f0000 {
> +      reg = <0x942f0000 0x8000>;
> +      no-map;
> +    };
> +    dsp_vdev0vring1: vdev0vring1@...f8000 {
> +      reg = <0x942f8000 0x8000>;
> +      no-map;
> +    };
> +    dsp_vdev0buffer: vdev0buffer@...00000 {
> +      compatible = "shared-dma-pool";
> +      reg = <0x94300000 0x100000>;
> +      no-map;
> +    };
> +
> +    dsp: dsp@...e8000 {
> +      compatible = "fsl,imx8mp-hifi4";
> +      reg = <0x3B6E8000 0x88000>;
> +      clocks = <&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 = "dsp_clk1", "dsp_clk2", "dsp_clk3";
> +      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>;
> +      syscon = <&audio_blk_ctrl>;
> +    };
> -- 
> 2.17.1
> 
>