Re: [PATCH 2/3] dt-bindings: mailbox: starfive: Add StarFive Meu Mailbox Driver

[Conor Dooley <conor@kernel.org>]

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On Mon, Dec 18, 2023 at 02:12:00PM +0800, Joshua Yeong wrote:
> The StarFive Meu Mailbox allow communication between AP and SCP cores
> through mailbox doorbell.
> 
> Co-developed-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
> Signed-off-by: Sia Jee Heng <jeeheng.sia@starfivetech.com>
> Signed-off-by: Joshua Yeong <joshua.yeong@starfivetech.com>
> Reviewed-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
> ---
>  .../bindings/mailbox/starfive-meu.yaml        | 66 +++++++++++++++++++
>  1 file changed, 66 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/starfive-meu.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/starfive-meu.yaml b/Documentation/devicetree/bindings/mailbox/starfive-meu.yaml
> new file mode 100644
> index 000000000000..dbc5cfdb90ff
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/starfive-meu.yaml
> @@ -0,0 +1,66 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mailbox/starfive-meu.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: StarFive MEU Mailbox Controller
> +
> +maintainers:
> +  - Jee Heng Sia <jeeheng.sia@starfivetech.com>
> +  - Joshua Yeong <joshua.yeong@starfivetech.com>
> +
> +description: |
> +  StarFive's Message-Exchange-Unit (MEU) is a mailbox controller that has 62
> +  independent doorbells. Each MEU channel consist of 31 doorbells and consist of
> +  a pair of Tx/Rx links that shall communicates with remote processor. The
> +  sender set the bit in the SET register to indicate data readiness for the
> +  receiver. An interrupt will be raised whenever receiving notification doorbell
> +  from remote processor. The receiver will clear the bit in the CLR register
> +  upon handling the doorbell notification. The sender should poll the STAT
> +  register before starting any transaction to ensure all on-going doorbells are
> +  processed.

What is/are the consumer(s) of this mailbox?
Is part of your RPMI implementation?

Cheers,
Conor.

> +
> +properties:
> +  compatible:
> +    enum:
> +      - starfive,jh8100-meu
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    items:
> +      - description: mailbox0
> +      - description: mailbox1
> +
> +  '#mbox-cells':
> +    description: represents index of the mailbox/doorbell paired channel
> +      channel  0 - 30 for mailbox0 doorbell
> +      channel 31 - 61 for mailbox1 doorbell
> +    const: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - '#mbox-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        meu: mailbox@1f370000 {
> +            compatible = "starfive,jh8100-meu";
> +            reg = <0x0 0x1f370000 0 0x8000>;
> +            interrupts = <170>, /* Mailbox0 */
> +                         <171>; /* Mailbox1 */
> +            #mbox-cells = <1>;
> +        };
> +    };
> +
> +...
> -- 
> 2.25.1
> 

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