linux-hardening - Re: [PATCH V4 1/2] dt-bindings: i3c: Add AMD I3C master controller support

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Message-ID: <a0817722-50f5-44c6-b07e-a10a48e87239@amd.com>
Date: Mon, 8 Sep 2025 14:13:56 +0200
From: Michal Simek <michal.simek@....com>
To: Rob Herring <robh@...nel.org>,
 Manikanta Guntupalli <manikanta.guntupalli@....com>
Cc: git@....com, alexandre.belloni@...tlin.com, Frank.Li@....com,
 krzk+dt@...nel.org, conor+dt@...nel.org, kees@...nel.org,
 gustavoars@...nel.org, jarkko.nikula@...ux.intel.com,
 linux-i3c@...ts.infradead.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
 radhey.shyam.pandey@....com, srinivas.goud@....com,
 shubhrajyoti.datta@....com, manion05gk@...il.com
Subject: Re: [PATCH V4 1/2] dt-bindings: i3c: Add AMD I3C master controller
 support

Hi Rob,

On 9/6/25 01:40, Rob Herring wrote:
> On Fri, Sep 05, 2025 at 05:07:39PM +0530, Manikanta Guntupalli wrote:
>> Add device tree binding documentation for the AMD I3C master controller.
>>
>> Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@....com>
>> ---
>> Changes for V2:
>> Updated commit subject and description.
>> Moved allOf to after required.
>> Removed xlnx,num-targets property.
>>
>> Changes for V3:
>> Updated commit description.
>> Corrected the order of properties and removed resets property.
>> Added compatible to required list.
>> Added interrupts to example.
>>
>> Changes for V4:
>> Added h/w documentation details.
>> ---
>>   .../devicetree/bindings/i3c/xlnx,axi-i3c.yaml | 55 +++++++++++++++++++
>>   1 file changed, 55 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/i3c/xlnx,axi-i3c.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/i3c/xlnx,axi-i3c.yaml b/Documentation/devicetree/bindings/i3c/xlnx,axi-i3c.yaml
>> new file mode 100644
>> index 000000000000..1daeb20205ac
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/i3c/xlnx,axi-i3c.yaml
>> @@ -0,0 +1,55 @@
>> +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/i3c/xlnx,axi-i3c.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: AMD I3C master
>> +
>> +maintainers:
>> +  - Manikanta Guntupalli <manikanta.guntupalli@....com>
>> +
>> +description:
>> +  The AXI-I3C IP is an I3C Controller with an AXI4-Lite interface, compatible
>> +  with the MIPI I3C Specification v1.1.1. The design includes bidirectional I/O
>> +  buffers that implement open collector drivers for the SDA and SCL signals.
>> +  External pull-up resistors are required to properly hold the bus at a Logic-1
>> +  level when the drivers are released.
>> +
>> +  For more details, please see https://docs.amd.com/r/en-US/pg439-axi-i3c
>> +
>> +properties:
>> +  compatible:
>> +    const: xlnx,axi-i3c-1.0
> 
> I'm still wondering where 1.0 comes from? From the link the only
> versions I could see are Vivado tool versions which appear to be year
> based. If the IP is bundled with the tool, then use the tool version
> (oldest version you tested with) if there is no other versioning. A 1.0
> version really just sounds like you made it up.
> 
> Something like bindings/sifive/sifive,blocks-ip-versioning.yaml is what
> I'm looking for.

This is what I have found in public space talking about it.

https://www.amd.com/en/products/adaptive-socs-and-fpgas/intellectual-property/vivado-ip-versioning.html

https://docs.amd.com/r/en-US/ug1118-vivado-creating-packaging-custom-ip/Versioning-and-Revision-Control

https://docs.amd.com/r/en-US/ug896-vivado-ip/Upgrading-IP

In past structure was slightly different.
There was also alphabet suffix.
You can see it for example here
Documentation/devicetree/bindings/timer/xlnx,xps-timer.yaml


This is for example change log based on Vivado version to give you an idea how 
it is tracked and described.

Thanks,
Michal


2025.1:
  * Version 1.0 (Rev. 4)
  * New Feature: Dynamic addressing feature updated to handle dynamic address 
register update within the IP.
  * New Feature: Updated IP Catalog taxonomy structure. This change has no 
impact to the IP.
  * Revision change in one or more subcores

2024.2.2:
  * Version 1.0 (Rev. 3)
  * No changes

2024.2.1:
  * Version 1.0 (Rev. 3)
  * Revision change in one or more subcores

2024.2:
  * Version 1.0 (Rev. 2)
  * New Feature: Support for Target added
  * Revision change in one or more subcores

2024.1.2:
  * Version 1.0 (Rev. 1)
  * No changes

2024.1.1:
  * Version 1.0 (Rev. 1)
  * Revision change in one or more subcores

2024.1:
  * Version 1.0
  * General: Initial release