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Message-ID: <ca7f1e62-5f70-4aa5-b539-764b778a71e5@kernel.org>
Date: Sun, 7 Apr 2024 10:57:01 +0200
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Subject: Re: [PATCH v2 2/6] dt-bindings: firmware: add i.MX SCMI Extension
 protocol
To: Peng Fan <peng.fan@nxp.com>, "Peng Fan (OSS)" <peng.fan@oss.nxp.com>,
 Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>,
 Conor Dooley <conor+dt@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
 Sascha Hauer <s.hauer@pengutronix.de>,
 Pengutronix Kernel Team <kernel@pengutronix.de>,
 Fabio Estevam <festevam@gmail.com>, Sudeep Holla <sudeep.holla@arm.com>,
 Cristian Marussi <cristian.marussi@arm.com>
Cc: "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
 "imx@lists.linux.dev" <imx@lists.linux.dev>,
 "linux-arm-kernel@lists.infradead.org"
 <linux-arm-kernel@lists.infradead.org>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
References: <20240405-imx95-bbm-misc-v2-v2-0-9fc9186856c2@nxp.com>
 <20240405-imx95-bbm-misc-v2-v2-2-9fc9186856c2@nxp.com>
 <9aab8dab-27c4-40b6-b1d5-0a2babe0700d@kernel.org>
 <DU0PR04MB941719A18C3F749E7D180FD888012@DU0PR04MB9417.eurprd04.prod.outlook.com>
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From: Krzysztof Kozlowski <krzk@kernel.org>
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In-Reply-To: <DU0PR04MB941719A18C3F749E7D180FD888012@DU0PR04MB9417.eurprd04.prod.outlook.com>
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On 07/04/2024 02:51, Peng Fan wrote:
>> 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@nxp.com>
>>>
>>> Add i.MX SCMI Extension protocols bindings for:
>>>  - Battery Backed Secure Module(BBSM)
>>
>> Which is what?
> 
> I should say BBM(BBSM + BBNSM), BBM has RTC and ON/OFF
> key features, but BBM is managed by SCMI firmware and exported
> to agent by BBM protocol. So add bindings for i.MX BBM protocol.
> 
> Is this ok?

No, I still don't know what is BBSM, BBNSM and BBM.

> 
>>
>>>  - MISC settings such as General Purpose Registers settings.
>>>
>>> Signed-off-by: Peng Fan <peng.fan@nxp.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
>>> +---
>>> +$id:
>>> +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
>>>
>> +cetree.org%2Fschemas%2Ffirmware%2Fimx%2Cscmi.yaml%23&data=05%7
>> C02%7Cp
>>>
>> +eng.fan%40nxp.com%7C5d16781d3eca425a342508dc562910b7%7C686ea
>> 1d3bc2b4c
>>>
>> +6fa92cd99c5c301635%7C0%7C0%7C638479981570959816%7CUnknown%
>> 7CTWFpbGZsb
>>>
>> +3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn
>> 0%3D
>>>
>> +%7C0%7C%7C%7C&sdata=mWNwPvu2eyF18MroVOBHb%2Fjeo%2BIHfV5V
>> h%2F9ebdx65MM
>>> +%3D&reserved=0
>>> +$schema:
>>> +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
>>> +cetree.org%2Fmeta-
>> schemas%2Fcore.yaml%23&data=05%7C02%7Cpeng.fan%40nx
>>>
>> +p.com%7C5d16781d3eca425a342508dc562910b7%7C686ea1d3bc2b4c6fa
>> 92cd99c5c
>>>
>> +301635%7C0%7C0%7C638479981570971949%7CUnknown%7CTWFpbGZs
>> b3d8eyJWIjoiM
>>>
>> +C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7
>> C%7C%7
>>>
>> +C&sdata=v4XnGG00D4I8j5MJvDUVYMRTm7yRrvz0V3fUyc5KAAA%3D&reser
>> ved=0
>>> +
>>> +title: i.MX System Control and Management Interface(SCMI) Vendor
>>> +Protocols Extension
>>> +
>>> +maintainers:
>>> +  - Peng Fan <peng.fan@nxp.com>
>>> +
>>> +allOf:
>>> +  - $ref: arm,scmi.yaml#
>>
>> Sorry, but arm,scmi is a final schema. Is your plan to define some common
>> part?
> 
> No. I just wanna add vendor extension per SCMI spec. 
> 
> 0x80-0xFF:
> Reserved for vendor or platform-specific extensions to this interface
> 
> Each vendor may have different usage saying id 0x81, so I add
> i.MX dt-schema file.
> 
>>
>>> +
>>> +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.
> 
> The MISC Protocol is for managing SoC Misc settings, such as SAI MCLK/MQS in
> Always On domain BLK CTRL,  SAI_CLK_SEL in WAKEUP BLK CTRL, gpio
> expanders which is under control of SCMI firmware.

So like a bag for everything which you do not want to call something
specific?

No, be specific...

> 
>>> +
>>> +    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?
> 
> Sorry. Is this ok?
> minItems: 1
> maxItems: 32

No. Does it answers Rob's question? I see zero correlation to his question.

Do not ignore emails from reviewers but respond to them.

> 
>>
>>> +        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.
> 
> Sorry, you mean the examples, or the whole dt-schema?

*Read comments and respond to them*. Regardless where they are.

Best regards,
Krzysztof