linux-kernel - Re: [PATCH V3 1/2] dt-bindings: i3c: Add AMD I3C master controller support

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Message-ID: <20250903204738.GA2744698-robh@kernel.org>
Date: Wed, 3 Sep 2025 15:47:38 -0500
From: Rob Herring <robh@...nel.org>
To: Manikanta Guntupalli <manikanta.guntupalli@....com>
Cc: git@....com, michal.simek@....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 V3 1/2] dt-bindings: i3c: Add AMD I3C master controller
 support

On Wed, Sep 03, 2025 at 03:29:05PM +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.
> ---
>  .../devicetree/bindings/i3c/xlnx,axi-i3c.yaml | 53 +++++++++++++++++++
>  1 file changed, 53 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..32f73c31121e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i3c/xlnx,axi-i3c.yaml
> @@ -0,0 +1,53 @@
> +# 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.
> +
> +properties:
> +  compatible:
> +    const: xlnx,axi-i3c-1.0

Where does the version number come from? This must correspond to some 
h/w documentation or it is useless.

Rob