linux-kernel - Re: [PATCH 02/22] dt-bindings: Add bindings for Keem Bay IPC driver

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Date:   Mon, 7 Dec 2020 10:01:52 -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,
        leonard.crestez@....com, palmerdabbelt@...gle.com,
        paul.walmsley@...ive.com, peng.fan@....com, shawnguo@...nel.org,
        linux-kernel@...r.kernel.org,
        Daniele Alessandrelli <daniele.alessandrelli@...el.com>,
        devicetree@...r.kernel.org
Subject: Re: [PATCH 02/22] dt-bindings: Add bindings for Keem Bay IPC driver

On Tue, Dec 01, 2020 at 02:34:51PM -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
> enables communication between the Computing Sub-System (CSS) and the
> Multimedia Sub-System (MSS) of the Intel Movidius SoC code named Keem
> Bay.
> 
> Cc: devicetree@...r.kernel.org
> Reviewed-by: Mark Gross <mgross@...ux.intel.com>
> Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@...el.com>
> ---
>  .../bindings/soc/intel/intel,keembay-ipc.yaml | 63 +++++++++++++++++++
>  1 file changed, 63 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..6e21c54d8f34
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/intel/intel,keembay-ipc.yaml
> @@ -0,0 +1,63 @@
> +# 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.

Sounds like a mailbox. 

What's the relationship between this and the xlink thing?

> +
> +properties:
> +  compatible:
> +    const: intel,keembay-ipc
> +
> +  reg:
> +    items:
> +      - description: The CSS (CPU) FIFO registers
> +      - description: The MSS (VPU) FIFO registers
> +
> +  reg-names:
> +    items:
> +      - const: css_fifo
> +      - const: mss_fifo
> +
> +  interrupts:
> +    items:
> +      - description: CSS FIFO not-empty interrupt
> +
> +  interrupt-controller: true
> +
> +  memory-region:
> +    items:
> +      - description: Reserved memory region used for CSS IPC buffers
> +      - description: Reserved memory region used for MSS IPC buffers
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - memory-region
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    ipc@...300f0 {
> +          compatible = "intel,keembay-ipc";
> +          reg = <0x203300f0 0x310>, /* CPU TIM FIFO */
> +                <0x208200f0 0x310>; /* VPU TIM FIFO */
> +          reg-names = "css_fifo", "mss_fifo";
> +          interrupts = <GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>;
> +          memory-region = <&css_ipc_reserved>, <&mss_ipc_reserved>;
> +    };
> -- 
> 2.17.1
>