linux-kernel - Re: [PATCH 1/1] i3c: master: svc: adjust SDR timing according to i3c spec

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Message-ID: <20240717095626.278d6e62@xps-13>
Date: Wed, 17 Jul 2024 09:56:26 +0200
From: Miquel Raynal <miquel.raynal@...tlin.com>
To: Frank Li <Frank.Li@....com>
Cc: Conor Culhane <conor.culhane@...vaco.com>, Alexandre Belloni
 <alexandre.belloni@...tlin.com>, linux-i3c@...ts.infradead.org (moderated
 list:SILVACO I3C DUAL-ROLE MASTER), linux-kernel@...r.kernel.org (open
 list), imx@...ts.linux.dev
Subject: Re: [PATCH 1/1] i3c: master: svc: adjust SDR timing according to
 i3c spec

Hi Frank,

Frank.Li@....com wrote on Fri, 12 Jul 2024 12:46:02 -0400:

> From: Carlos Song <carlos.song@....com>
> 
> According to I3C Specification(Version 1.1) 5.1.2.4 "Use of Clock
> Speed to Prevent Legacy I2C Devices From Seeing I3C traffic", when
> slow i2c devices(FM/FM+ rate i2c frequency without 50ns filter)
> works on i3c bus, i3c SDR should work at FM/FM+ rate.
> 
> Adjust timing for difference mode.

The calculations below look quite complex, but if you believe this is
right, I'm fine with it.

Acked-by: Miquel Raynal <miquel.raynal@...tlin.com>

> 
> Signed-off-by: Clark Wang <xiaoning.wang@....com>
> Signed-off-by: Carlos Song <carlos.song@....com>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---

Thanks,
Miquèl