linux-kernel - RE: [PATCH 1/5] dt-bindings: firmware: add i.MX SCMI Extension protocol

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Message-ID:
 <DU0PR04MB9417EFBFBFD374B8A5E7039D88012@DU0PR04MB9417.eurprd04.prod.outlook.com>
Date: Sun, 7 Apr 2024 12:35:30 +0000
From: Peng Fan <peng.fan@....com>
To: Rob Herring <robh@...nel.org>, "Peng Fan (OSS)" <peng.fan@....nxp.com>
CC: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley
	<conor+dt@...nel.org>, Sudeep Holla <sudeep.holla@....com>, Cristian Marussi
	<cristian.marussi@....com>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer
	<s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>, dl-linux-imx <linux-imx@....com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 1/5] dt-bindings: firmware: add i.MX SCMI Extension
 protocol

Hi Rob,

Sorry for late reply.

> Subject: Re: [PATCH 1/5] dt-bindings: firmware: add i.MX SCMI Extension
> protocol
> 
> On Fri, Feb 02, 2024 at 02:34:39PM +0800, Peng Fan (OSS) wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > Add i.MX SCMI Extension protocol BBM and MISC binding.
> 
> No idea what BBM and MISC are.
The Battery Backup (BB) Domain contains the Battery Backed
Security Module (BBSM) and the Battery Backed Non-Secure Module
(BBNSM).
BBNSM:
The BBNSM is the interface to a non-interruptable power supply
(backup battery) and serves as the non-volatile logic and storage
for the chip. When the chip is powered off, the BBNSM will maintain
PMIC logic while connected to a backup supply.
Main features: RTC, PMIC Control, ONOFF Control BBSM serves as
nonvolatile security logic and storage for ELE Main features:
Monotonic counter, Secure RTC, Zeroizable Master Key, Security
Violation and Tamper Detection


MISC: it is i.MX SCMI extension protocol, including BLK CTRL
settings, board level GPIO expander settings. 
> 
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >  .../devicetree/bindings/firmware/nxp,scmi.yaml     | 64
> ++++++++++++++++++++++
> >  1 file changed, 64 insertions(+)
> >
> > diff --git a/Documentation/devicetree/bindings/firmware/nxp,scmi.yaml
> > b/Documentation/devicetree/bindings/firmware/nxp,scmi.yaml
> > new file mode 100644
> > index 000000000000..00d6361bbbea
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/firmware/nxp,scmi.yaml
> > @@ -0,0 +1,64 @@
> > +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause) # Copyright 2024
> > +NXP %YAML 1.2
> > +---
> > +$id:
> > +https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fdevi
> >
> +cetree.org%2Fschemas%2Ffirmware%2Fnxp%2Cscmi.yaml%23&data=05%7
> C02%7Cp
> >
> +eng.fan%40nxp.com%7C625d14c7c4f14d16289908dc2bdc9967%7C686ea1
> d3bc2b4c
> >
> +6fa92cd99c5c301635%7C0%7C0%7C638433473675932860%7CUnknown%
> 7CTWFpbGZsb
> >
> +3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn
> 0%3D
> >
> +%7C0%7C%7C%7C&sdata=dP0%2FgyCwmWtSW9BNYWZQtunpgayjCl2AkSkj
> ZIZjn9o%3D&
> > +reserved=0
> > +$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%7C625d14c7c4f14d16289908dc2bdc9967%7C686ea1d3bc2b4c6fa9
> 2cd99c5c
> >
> +301635%7C0%7C0%7C638433473675946764%7CUnknown%7CTWFpbGZs
> b3d8eyJWIjoiM
> >
> +C4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7
> C%7C%7
> >
> +C&sdata=efmqKP8%2FyS4YoDLCb%2Fmxx72D7ZW2KxiEDhgnWdEUT1s%3D
> &reserved=0
> > +
> > +title: i.MX System Control and Management Interface (SCMI) Protocol
> > +Extension
> > +
> > +maintainers:
> > +  - Peng Fan <peng.fan@....com>
> > +
> > +allOf:
> > +  - $ref: arm,scmi.yaml#
> > +
> > +properties:
> > +  protocol@11:
> 
> Wrong unit-address?

Yeah. Fixed.

> 
> > +    $ref: 'arm,scmi.yaml#/$defs/protocol-node'
> > +    unevaluatedProperties: false
> 
> Description of what this protocol is needed.

Added.

> 
> > +
> > +    properties:
> > +      reg:
> > +        const: 0x81
> > +
> > +  protocol@13:
> > +    $ref: 'arm,scmi.yaml#/$defs/protocol-node'
> > +    unevaluatedProperties: false
> > +
> > +    properties:
> > +      reg:
> > +        const: 0x84
> > +
> > +      wakeup-sources:
> 
> Is this somehow generic?

I think it yes, but if you disagree, please suggest.

> 
> > +        description: each entry consists of 2 integers and represents
> > + the source and edge
> 
> What does 'edge' mean in this context?

Electric signal edge.

> 
> > +        items:
> > +          items:
> > +            - description: the wakeup source
> > +            - description: the wakeup edge
> 
> Constraints?

Will add in V3.
minItems: 1
maxItems: 32
> 
> > +        $ref: /schemas/types.yaml#/definitions/uint32-matrix
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    firmware {
> > +        scmi {
> 
> 
> Need a compatible here so this actually gets tested.

Fixed.

> 
> > +            #address-cells = <1>;
> > +            #size-cells = <0>;
> > +
> > +            protocol@81 {
> > +              reg = <0x81>;
> > +            };
> > +
> > +            protocol@84 {
> > +              reg = <0x84>;
> > +              wakeup-sources = <6 1
> > +                                7 1
> > +                                8 1
> > +                                9 1
> > +                                10 1>;
> 
> <> around each entry. e.g. "<6 1>"

Fix in V3.

Thanks,
Peng.
> 
> > +            };
> > +         };
> > +    };
> > +...
> >
> > --
> > 2.37.1
> >