linux-kernel - Re: [PATCH v6 04/34] dt-bindings: Add bindings for Keem Bay IPC driver

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Date:   Fri, 5 Mar 2021 15:01:40 -0600
From:   Rob Herring <robh@...nel.org>
To:     mgross@...ux.intel.com
Cc:     markgross@...nel.org, arnd@...db.de, bp@...e.de,
        damien.lemoal@....com, dragan.cvetic@...inx.com,
        gregkh@...uxfoundation.org, corbet@....net,
        palmerdabbelt@...gle.com, paul.walmsley@...ive.com,
        peng.fan@....com, shawnguo@...nel.org, jassisinghbrar@...il.com,
        linux-kernel@...r.kernel.org,
        Daniele Alessandrelli <daniele.alessandrelli@...el.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v6 04/34] dt-bindings: Add bindings for Keem Bay IPC
 driver

On Fri, Feb 12, 2021 at 02:22:34PM -0800, mgross@...ux.intel.com wrote:
> From: Daniele Alessandrelli <daniele.alessandrelli@...el.com>
> 
> Add DT binding documentation for the Intel Keem Bay IPC driver, which

Bindings are for h/w blocks, not drivers. From a binding perspective, I 
don't really care what the driver architecture for some OS looks like. I 
continue to not understand what this h/w looks like. A block diagram 
would help as would understanding what blocks have multiple clients 
(mailboxes and xlink in particular).

> enables communication between the Computing Sub-System (CSS) and the
> Multimedia Sub-System (MSS) of the Intel Movidius SoC code named Keem
> Bay.
> 
> Cc: Rob Herring <robh+dt@...nel.org>
> Cc: devicetree@...r.kernel.org
> Reviewed-by: Mark Gross <mgross@...ux.intel.com>
> Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@...el.com>
> Signed-off-by: Mark Gross <mgross@...ux.intel.com>
> ---
>  .../bindings/soc/intel/intel,keembay-ipc.yaml | 45 +++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/intel/intel,keembay-ipc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/soc/intel/intel,keembay-ipc.yaml b/Documentation/devicetree/bindings/soc/intel/intel,keembay-ipc.yaml
> new file mode 100644
> index 000000000000..586fe73f4cd4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/intel/intel,keembay-ipc.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (C) 2020 Intel Corporation
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/soc/intel/intel,keembay-ipc.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: Keem Bay IPC
> +
> +maintainers:
> +  - Daniele Alessandrelli <daniele.alessandrelli@...el.com>
> +
> +description:
> +  The Keem Bay IPC driver enables Inter-Processor Communication (IPC) with the
> +  Visual Processor Unit (VPU) embedded in the Intel Movidius SoC code named
> +  Keem Bay.
> +
> +properties:
> +  compatible:
> +    const: intel,keembay-ipc
> +
> +  memory-region:
> +    items:
> +      - description:
> +          Reserved memory region used by the CPU to allocate IPC packets.
> +      - description:
> +          Reserved memory region used by the VPU to allocate IPC packets.
> +
> +  mboxes:
> +    description: VPU IPC Mailbox.
> +
> +required:
> +  - compatible
> +  - memory-region
> +  - mboxes
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    ipc {
> +          compatible = "intel,keembay-ipc";
> +          memory-region = <&ipc_cpu_reserved>, <&ipc_vpu_reserved>;
> +          mboxes = <&vpu_ipc_mbox 0>;
> +    };
> -- 
> 2.17.1
>