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

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Message-ID: <CAHQ1cqHhF6_2Mx3B=w7GEUWDa0RegpUwe=ETCr71PXsDjKRJDQ@mail.gmail.com>
Date:   Tue, 20 Aug 2019 18:35:40 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Fabio Estevam <festevam@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Chris Healy <cphealy@...il.com>
Subject: Re: [PATCH] ARM: dts: vf610-zii-cfu1: Slow I2C0 down to 100kHz

On Tue, Aug 20, 2019 at 8:29 AM Andrew Lunn <andrew@...n.ch> wrote:
>
> On Mon, Aug 19, 2019 at 08:08:04PM -0700, Andrey Smirnov wrote:
> > Fiber-optic module attached to the bus is only rated to work at
> > 100kHz, so drop the bus frequncy to accomodate that.
>
> Hi Andrey
>
> Did you review all the other ZII platforms? I could imaging the same
> problem happening else where.
>

Yes, AFAICT, fiber-optic modules are present only on SCU4
(vf610-zii-scu4-aib.dts), CFU1 (vf610-zii-cfu1.dts) and VF610 Dev
board rev. B/C (vf610-zii-dev*.dts[i]). Of all three only CFU1 has
corresponding I2C bus running @ 400 kHz.

Thanks,
Andrey Smirnov