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

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Message-ID:
 <DU0PR04MB9417786C4A0B2B54947D70E588012@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date: Sun, 7 Apr 2024 01:50:03 +0000
From: Peng Fan <peng.fan@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>, "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: "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 2/6] dt-bindings: firmware: add i.MX SCMI Extension
 protocol

> Subject: RE: [PATCH v2 2/6] dt-bindings: firmware: add i.MX SCMI Extension
> protocol
> 
> > 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?
> 
> 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?
> 
> >
> > >  - 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
> > > +---
> > > +$id:
> > > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fde
> > > +vi
> > >
> >
> +cetree.org%2Fschemas%2Ffirmware%2Fimx%2Cscmi.yaml%23&data=05%7
> > C02%7Cp
> > >
> >
> +eng.fan%40nxp.com%7C5d16781d3eca425a342508dc562910b7%7C686ea
> > 1d3bc2b4c
> > >
> > +6fa92cd99c5c301635%7C0%7C0%7C638479981570959816%7CUnknown%
> > 7CTWFpbGZsb
> > >
> >
> +3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn
> > 0%3D
> > >
> >
> +%7C0%7C%7C%7C&sdata=mWNwPvu2eyF18MroVOBHb%2Fjeo%2BIHfV5V
> > h%2F9ebdx65MM
> > > +%3D&reserved=0
> > > +$schema:
> > > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fde
> > > +vi
> > > +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@....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.
> 
> > > +
> > > +    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
> 
> >
> > > +        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?

Missed Rob's comment, will use
< > for each entry.

Thanks,
Peng.

> 
> Thanks,
> Peng.
> >
> > Best regards,
> > Krzysztof