linux-kernel - Re: [PATCH v2 2/6] dt-bindings: firmware: add i.MX SCMI Extension protocol

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Message-ID: <9aab8dab-27c4-40b6-b1d5-0a2babe0700d@kernel.org>
Date: Sat, 6 Apr 2024 13:02:23 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
 Sascha Hauer <s.hauer@...gutronix.de>,
 Pengutronix Kernel Team <kernel@...gutronix.de>,
 Fabio Estevam <festevam@...il.com>, Sudeep Holla <sudeep.holla@....com>,
 Cristian Marussi <cristian.marussi@....com>
Cc: Peng Fan <peng.fan@....com>, devicetree@...r.kernel.org,
 imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/6] dt-bindings: firmware: add i.MX SCMI Extension
 protocol

On 05/04/2024 14:39, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Add i.MX SCMI Extension protocols bindings for:
>  - Battery Backed Secure Module(BBSM)

Which is what?

>  - MISC settings such as General Purpose Registers settings.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  .../devicetree/bindings/firmware/imx,scmi.yaml     | 80 ++++++++++++++++++++++
>  1 file changed, 80 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/firmware/imx,scmi.yaml b/Documentation/devicetree/bindings/firmware/imx,scmi.yaml
> new file mode 100644
> index 000000000000..7ee19a661d83
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/firmware/imx,scmi.yaml
> @@ -0,0 +1,80 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2024 NXP
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/firmware/imx,scmi.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: i.MX System Control and Management Interface(SCMI) Vendor Protocols Extension
> +
> +maintainers:
> +  - Peng Fan <peng.fan@....com>
> +
> +allOf:
> +  - $ref: arm,scmi.yaml#

Sorry, but arm,scmi is a final schema. Is your plan to define some
common part?

> +
> +properties:
> +  protocol@81:
> +    $ref: 'arm,scmi.yaml#/$defs/protocol-node'
> +    unevaluatedProperties: false
> +    description:
> +      The BBM Protocol is for managing Battery Backed Secure Module (BBSM) RTC
> +      and the ON/OFF Key
> +
> +    properties:
> +      reg:
> +        const: 0x81
> +
> +    required:
> +      - reg
> +
> +  protocol@84:
> +    $ref: 'arm,scmi.yaml#/$defs/protocol-node'
> +    unevaluatedProperties: false
> +    description:
> +      The MISC Protocol is for managing SoC Misc settings, such as GPR settings

Genera register is not a setting... this is a pleonasm. Please be more
specific what is the GPR, MISC protocol etc.

> +
> +    properties:
> +      reg:
> +        const: 0x84
> +
> +      wakeup-sources:
> +        description:
> +          Each entry consists of 2 integers, represents the source and electric signal edge

Can you answer questions from reviewers?

> +        items:
> +          items:
> +            - description: the wakeup source
> +            - description: the wakeup electric signal edge
> +        $ref: /schemas/types.yaml#/definitions/uint32-matrix
> +
> +    required:
> +      - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    firmware {
> +        scmi {
> +            compatible = "arm,scmi";

> +            mboxes = <&mu2 5 0>, <&mu2 3 0>, <&mu2 3 1>;
> +            shmem = <&scmi_buf0>, <&scmi_buf1>;
> +
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            protocol@81 {
> +                reg = <0x81>;
> +            };
> +
> +            protocol@84 {
> +                reg = <0x84>;
> +                wakeup-sources = <0x8000 1
> +                                  0x8001 1
> +                                  0x8002 1
> +                                  0x8003 1
> +                                  0x8004 1>;

Nothing improved... If you are going to ignore reviews, then you will
only get NAKed.

Best regards,
Krzysztof