linux-kernel - Re: [PATCH 2/2] arm64: dts: renesas: r9a09g047e57-smarc: Add overlay for P3T1085UK-ARD

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Message-ID: <aR72ZPGIJD9JWOCr@tom-desktop>
Date: Thu, 20 Nov 2025 12:07:23 +0100
From: Tommaso Merciai <tommaso.merciai.xr@...renesas.com>
To: Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc: tomm.merciai@...il.com, linux-renesas-soc@...r.kernel.org,
	biju.das.jz@...renesas.com,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Magnus Damm <magnus.damm@...il.com>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] arm64: dts: renesas: r9a09g047e57-smarc: Add overlay
 for P3T1085UK-ARD

Hi Wolfram,
Thanks for your review!

On Wed, Nov 19, 2025 at 07:12:56AM +0100, Wolfram Sang wrote:
> 
> > Your suggestion is to keep only Patch 1/2 dropping alias line right?
> 
> Yes.
> 
> We could think about enabling I3C unconditionally by adding this to
> rzg3e-smarc-som.dtsi:

Fine to me. Thank you.

> 
> +       i2c-scl-hz = <400000>;
> +       i3c-scl-hz = <12500000>;
> +       status = "okay";
> 
> So, I3C will just work when you connect devices to it. The I3C frequency
> might be depending a bit on the I3C target board and how it is wired.
> Maybe use 10Mhz as a safe value and add a comment?
> 

Since our current testing setup works fine with 12.5 MHz, I would go with that.
If another target board is used, it can override this value in its board overlay.

I will send v2 addressing your comments.

Kind Regards,
Tommaso