linux-kernel - Re: [PATCH v3 1/3] dt-bindings: mailbox: add Sophgo CV18XX series SoC

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Message-ID: <20250428-glade-unripe-4cdb4913ede4@spud>
Date: Mon, 28 Apr 2025 17:52:52 +0100
From: Conor Dooley <conor@...nel.org>
To: Junhui Liu <junhui.liu@...moral.tech>
Cc: Jassi Brar <jassisinghbrar@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Inochi Amaoto <inochiama@...il.com>,
	Yuntao Dai <d1581209858@...e.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	sophgo@...ts.linux.dev, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v3 1/3] dt-bindings: mailbox: add Sophgo CV18XX series SoC

On Mon, Apr 28, 2025 at 08:39:44PM +0800, Junhui Liu wrote:
> From: Yuntao Dai <d1581209858@...e.com>
> 
> Introduce the mailbox module for CV18XX series SoC, which is responsible
> for interchanging messages between asymmetric processors.
> 
> Signed-off-by: Yuntao Dai <d1581209858@...e.com>
> Signed-off-by: Junhui Liu <junhui.liu@...moral.tech>
> ---
>  .../bindings/mailbox/sophgo,cv1800b-mailbox.yaml   | 57 ++++++++++++++++++++++
>  1 file changed, 57 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/sophgo,cv1800b-mailbox.yaml b/Documentation/devicetree/bindings/mailbox/sophgo,cv1800b-mailbox.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..5815dc02189c973d681f5b4ff22a9fb7536802b9
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/sophgo,cv1800b-mailbox.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mailbox/sophgo,cv1800b-mailbox.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Sophgo CV1800/SG2000 mailbox controller
> +
> +maintainers:
> +  - Yuntao Dai <d1581209858@...e.com>
> +  - Junhui Liu <junhui.liu@...moral.tech>
> +
> +description: |
> +  Mailboxes integrated in Sophgo CV1800/SG2000 SoCs have 8 channels, each
> +  shipping an 8-byte FIFO. Any processor can write to an arbitrary channel
> +  and raise interrupts to receivers. Sending messages to itself is also
> +  supported.

> +  Sophgo CV1800/SG2000 SoCs include the following processors, numbered as:
> +  <0> Cortex-A53 (Only available on CV181X/SG200X)
> +  <1> C906B
> +  <2> C906L
> +  <3> 8051

I think this section should be moved to the mbox-cells property, since it
is describing how to use the mboxes property.

> +
> +properties:
> +  compatible:
> +    const: sophgo,cv1800b-mailbox

Remind me, why only a cv1800b compatible when you also mention sg2000?
Rebranding of the same SoC, or something like that?

Cheers,
Conor.

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  "#mbox-cells":
> +    const: 2
> +    description:
> +      The first cell indicates the channel index (0-7), the second cell
> +      indicates the target processor ID (0-3) to which messages are sent.
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - "#mbox-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    mailbox@...0000 {
> +        compatible = "sophgo,cv1800b-mailbox";
> +        reg = <0x01900000 0x1000>;
> +        interrupts = <101 IRQ_TYPE_LEVEL_HIGH>;
> +        #mbox-cells = <2>;
> +    };
> 
> -- 
> 2.49.0
> 

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