linux-kernel - Re: [PATCH RFC 1/2] dt-bindings: mailbox: qcom: Document qcom,tmelite-qmp

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Message-ID: <e6759ca4-bcfb-4817-8a72-d1e9eb5d3d02@kernel.org>
Date: Thu, 5 Dec 2024 09:12:26 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Sricharan R <quic_srichara@...cinc.com>, jassisinghbrar@...il.com,
 robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
 devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 1/2] dt-bindings: mailbox: qcom: Document
 qcom,tmelite-qmp

On 05/12/2024 09:06, Sricharan R wrote:
> From: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> 
> This binding describes the component responsible for communication
> between the TME-L server based subsystems (Q6) and the TME-L client
> (APPSS/BTSS/AUDIOSS), used for security services like secure image
> authentication, enable/disable efuses, crypto services. Each client
> in the   SoC has its own block of message RAM and IRQ for communication
> with the TME-L SS. The protocol used to communicate in the message RAM
> is known as Qualcomm Messaging Protocol (QMP).

This is RFC, so only limited review follows. I will review more once
this is ready for review.

> 
> Signed-off-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
> ---
>  .../bindings/mailbox/qcom,tmelite-qmp.yaml    | 70 +++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mailbox/qcom,tmelite-qmp.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mailbox/qcom,tmelite-qmp.yaml b/Documentation/devicetree/bindings/mailbox/qcom,tmelite-qmp.yaml
> new file mode 100644
> index 000000000000..1f2b3e02b894
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mailbox/qcom,tmelite-qmp.yaml
> @@ -0,0 +1,70 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mailbox/qcom,tmelite-qmp.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm TMELITE IPCC channel
> +
> +maintainers:
> +  - Sricharan Ramabadhran <quic_srichara@...cinc.com>
> +
> +description:
> +  This binding describes the component responsible for communication


Describe the hardware, not the binding.

> +  between the TME-L server based subsystems (Q6) and the TME-L client
> +  (APPSS/BTSS/AUDIOSS), used for security services like secure image
> +  authentication, enable/disable efuses, crypto services. Each client
> +  in the   SoC has its own block of message RAM and IRQ for communication
> +  with the TME-L SS. The protocol used to communicate in the message RAM
> +  is known as Qualcomm Messaging Protocol (QMP).
> +
> +properties:
> +  compatible:
> +    items:
> +      - enum:
> +          - qcom,ipq5424-tmelite-qmp
> +      - const: qcom,tmelite-qmp

Drop generic compatible.


> +
> +  reg:
> +    maxItems: 1
> +    description:
> +      The base address and size of the message RAM for this client's
> +      communication with the TMELITE core

Drop obvious description. Same everywhere else.

> +
> +  interrupts:
> +    maxItems: 1
> +    description:
> +      Should specify the TMELITE message IRQ for this client
> +
> +  mboxes:
> +    maxItems: 1
> +    description:
> +      Reference to the mailbox representing the outgoing doorbell in APCS for
> +      this client, as described in mailbox/mailbox.txt
> +
> +  "#mbox-cells":
> +    const: 2
> +    description:
> +      The first cell is the client-id, and the second cell is the signal-id.

I guess that's the only description not stating obvious.

> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - mboxes
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    tmel_qmp: qmp@...90000 {

Node names should be generic. See also an explanation and list of
examples (not exhaustive) in DT specification:
https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation


> +           compatible = "qcom,ipq5424-tmelite-qmp", "qcom,tmelite-qmp";

Use 4 spaces for example indentation.

> +           reg = <0x32090000 0x2000>;
> +...


Best regards,
Krzysztof