linux-kernel - Re: [PATCH v2] ARM: dts: vf610-zii-cfu1: Slow I2C0 down to 100 kHz

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Message-ID: <20190821154455.GD22091@lunn.ch>
Date:   Wed, 21 Aug 2019 17:44:55 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Andrey Smirnov <andrew.smirnov@...il.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Fabio Estevam <festevam@...il.com>,
        Shawn Guo <shawnguo@...nel.org>, linux-kernel@...r.kernel.org,
        Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH v2] ARM: dts: vf610-zii-cfu1: Slow I2C0 down to 100 kHz

On Tue, Aug 20, 2019 at 06:39:36PM -0700, Andrey Smirnov wrote:
> Fiber-optic modules attached to the bus are only rated to work at
> 100 kHz, so decrease the bus frequency to accommodate that.
> 
> Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
> Cc: Shawn Guo <shawnguo@...nel.org>
> Cc: Chris Healy <cphealy@...il.com>
> Cc: Fabio Estevam <festevam@...il.com>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org

Reviewed-by: Andrew Lunn <andrew@...n.ch>

I took a quick look at some of the SFP standards. 100KHz is part of
the standard. So we should try to remember to keep an eye of this as
other boards are merged.

    Andrew