linux-kernel - Re: [PATCH v8] i2c: riic: Implement bus recovery

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Message-ID: <aAtSayFrtSh9LC-J@shikoro>
Date: Fri, 25 Apr 2025 11:14:19 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: "Lad, Prabhakar" <prabhakar.csengg@...il.com>
Cc: Chris Brandt <chris.brandt@...esas.com>,
	Andi Shyti <andi.shyti@...nel.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	linux-renesas-soc@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, Biju Das <biju.das.jz@...renesas.com>,
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
	Andy Shevchenko <andy@...nel.org>
Subject: Re: [PATCH v8] i2c: riic: Implement bus recovery

Hi Prabhakar,

> I prepared a setup on SMARC2 RZ/G3S and I can confirm it is working

This is good news!

> (but this is failing on SMARC RZ/G2L I'll look further into this)

This not so much. Hmmm, are you verifying against the same I2C device
on the carrier board? If you compare against different I2C devices on
the module board, the culprit might be the I2C device.

> For the SMARC2 RZ/G3S to make sure the I2C GPIO pins behave as
> opendrain I have the below patch for pinctrl

Do you really need this patch? The GPIO lines are wired to SCL/SDA which
are already pulled up. Search for R118 in the module schematics.

All the best,

   Wolfram


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