linux-kernel - Re: [PATCH 2/2] dt-bindings: mailbox: Add devicetree binding for bcm74110 mbox

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Message-ID: <e7f51014-10b2-4f9c-9929-f2a4f32b023c@kernel.org>
Date: Fri, 28 Mar 2025 08:31:19 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: justin.chen@...adcom.com, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Cc: florian.fainelli@...adcom.com, conor+dt@...nel.org, krzk+dt@...nel.org,
 robh@...nel.org, jassisinghbrar@...il.com,
 bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH 2/2] dt-bindings: mailbox: Add devicetree binding for
 bcm74110 mbox

On 27/03/2025 23:16, justin.chen@...adcom.com wrote:
> From: Justin Chen <justin.chen@...adcom.com>
> 
> Add devicetree YAML binding for brcmstb bcm74110 mailbox used
> for communicating with a co-processor.
> 
> Signed-off-by: Justin Chen <justin.chen@...adcom.com>

Bindings are before users, see DT submitting patches.

> ---
>  .../bindings/mailbox/brcm,bcm74110-mbox.yaml  | 68 +++++++++++++++++++
>  1 file changed, 68 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/brcm,bcm74110-mbox.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/brcm,bcm74110-mbox.yaml b/Documentation/devicetree/bindings/mailbox/brcm,bcm74110-mbox.yaml
> new file mode 100644
> index 000000000000..139728a35303
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/brcm,bcm74110-mbox.yaml
> @@ -0,0 +1,68 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mailbox/brcm,bcm74110-mbox.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Broadcom BCM74110 Mailbox Driver

Driver as Linux driver? Drop, bindings describe hardware.

> +
> +maintainers:
> +  - Justin Chen <justin.chen@...adcom.com>
> +  - Florian Fainelli <florian.fainelli@...adcom.com>
> +
> +description: Broadcom mailbox driver first introduced with 74110

Same comments.

> +
> +properties:
> +  compatible:
> +    enum:
> +      - brcm,bcm74110-mbox
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  "#mbox-cells":
> +    const: 2
> +    description:
> +      The first cell is channel type and second cell is shared memory slot
> +
> +  brcm,mbox_tx:

No underscores. See DTS coding style.

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Mailbox transmit doorbell

Why is this needed in DT? How many instances do you have in one SoC?
Where is the SoC DTS?

> +
> +  brcm,mbox_rx:
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    description: Mailbox receive doorbell
> +
> +  brcm,mbox_shmem:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    maxItems: 2
> +    description: Mailbox shared memory region and size

No, use existing properties, e.g. memory region.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - "#mbox-cells"
> +  - brcm,mbox_tx
> +  - brcm,mbox_rx
> +  - brcm,mbox_shmem
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +        brcm_pmc_mailbox: brcm_pmc_mailbox@...2000 {

Use indentation we expect. See writing schema, example-schema.

> +                #mbox-cells = <2>;
> +                compatible = "brcm,bcm74110-mbox";

Fix order, see DTS coding style.



Best regards,
Krzysztof