linux-kernel - Re: [PATCH v2] arm64: dts: armada-3720-turris-mox: remove mrvl,i2c-fast-mode

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Date:   Mon, 28 Jun 2021 17:16:20 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Pali Rohár <pali@...nel.org>
Cc:     Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Marek Behún <kabel@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] arm64: dts: armada-3720-turris-mox: remove
 mrvl,i2c-fast-mode

On Mon, Jun 28, 2021 at 05:12:29PM +0200, Pali Rohár wrote:
> Some SFP modules are not detected when i2c-fast-mode is enabled even when
> clock-frequency is already set to 100000. The I2C bus violates the timing
> specifications when run in fast mode. So disable fast mode on Turris Mox.

Yes. SFP module specification is 100kHz max on the I2C bus, which is
often forgotten about until someone runs into a problem.

Acked-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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