linux-kernel - Re: [PATCH v5 1/6] dt-bindings: remoteproc: Add Xilinx RPU subsystem bindings

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Message-ID: <45fea4a1-387f-9684-a90b-58b695b54172@linaro.org>
Date:   Sat, 21 May 2022 17:12:54 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Tanmay Shah <tanmay.shah@...inx.com>, bjorn.andersson@...aro.org,
        mathieu.poirier@...aro.org, robh+dt@...nel.org, krzk+dt@...nel.org,
        michal.simek@...inx.com
Cc:     linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v5 1/6] dt-bindings: remoteproc: Add Xilinx RPU subsystem
 bindings

On 18/05/2022 21:44, Tanmay Shah wrote:
> +description: |
> +  The Xilinx platforms include a pair of Cortex-R5F processors (RPU) for
> +  real-time processing based on the Cortex-R5F processor core from ARM.
> +  The Cortex-R5F processor implements the Arm v7-R architecture and includes a
> +  floating-point unit that implements the Arm VFPv3 instruction set.
> +
> +properties:
> +  compatible:
> +    const: xlnx,zynqmp-r5fss
> +
> +  xlnx,cluster-mode:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    enum: [0, 1, 2]
> +    description: |
> +      The RPU MPCore can operate in split mode(Dual-processor performance), Safety
> +      lock-step mode(Both RPU cores execute the same code in lock-step,
> +      clock-for-clock) or Single CPU mode (RPU core 0 can be held in reset while
> +      core 1 runs normally). The processor does not support dynamic configuration.
> +      Switching between modes is only permitted immediately after a processor reset.
> +      If set to  1 then lockstep mode and if 0 then split mode.
> +      If set to  2 then single CPU mode. When not defined, default will be lockstep mode.
> +
> +patternProperties:
> +  "^r5f-[a-f0-9]+$":
> +    type: object
> +    description: |
> +      The RPU is located in the Low Power Domain of the Processor Subsystem.
> +      Each processor includes separate L1 instruction and data caches and
> +      tightly coupled memories (TCM). System memory is cacheable, but the TCM
> +      memory space is non-cacheable.
> +
> +      Each RPU contains one 64KB memory and two 32KB memories that
> +      are accessed via the TCM A and B port interfaces, for a total of 128KB
> +      per processor. In lock-step mode, the processor has access to 256KB of
> +      TCM memory.
> +
> +    properties:
> +      compatible:
> +        const: xlnx,zynqmp-r5f
> +
> +      power-domains:
> +        description: RPU core PM domain specifier
> +        maxItems: 1
> +
> +      mboxes:
> +        items:
> +          - description: mailbox channel to send data to RPU
> +          - description: mailbox channel to receive data from RPU
> +        minItems: 1
> +
> +      mbox-names:
> +        items:
> +          - const: tx
> +          - const: rx
> +        minItems: 1
> +
> +      sram:
> +        $ref: /schemas/types.yaml#/definitions/phandle-array
> +        minItems: 1

maxItems instead

> +        description: |
> +          phandles to one or more reserved on-chip SRAM regions. Other than TCM,
> +          the RPU can execute instructions and access data from, the OCM memory,
> +          the main DDR memory, and other system memories.
> +
> +          The regions should be defined as child nodes of the respective SRAM
> +          node, and should be defined as per the generic bindings in,
> +          Documentation/devicetree/bindings/sram/sram.yaml
> +
> +      memory-region:
> +        description: |
> +          List of phandles to the reserved memory regions associated with the
> +          remoteproc device. This is variable and describes the memories shared with
> +          the remote processor (e.g. remoteproc firmware and carveouts, rpmsg
> +          vrings, ...). This reserved memory region will be allocated on DDR memory.
> +        minItems: 1
> +        items:
> +          - description: region used for RPU firmware image section
> +          - description: vdev buffer
> +          - description: vring0
> +          - description: vring1
> +        additionalItems: true

How did this one appear here? It does not look correct, so why do you
need it?

> +
> +    required:
> +      - compatible
> +      - power-domains
> +
> +    unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +\

Best regards,
Krzysztof