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

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Date:   Mon, 8 Mar 2021 12:20:08 -0800
From:   mark gross <mgross@...ux.intel.com>
To:     Rob Herring <robh@...nel.org>
Cc:     mgross@...ux.intel.com, 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, Mar 05, 2021 at 03:01:40PM -0600, Rob Herring wrote:
> 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).
I'm working to gather this info.

thanks!

--mark

> 
> > 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
> >