linux-kernel - Re: [RESEND v6,3/3] arm64: dts: fsl-ls208xa-rdb: fix an errata E-00013

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Date:   Fri, 3 Jan 2020 14:09:41 +0000
From:   Peter Rosin <peda@...ntia.se>
To:     Biwen Li <biwen.li@....com>,
        "leoyang.li@....com" <leoyang.li@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>
CC:     "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [RESEND v6,3/3] arm64: dts: fsl-ls208xa-rdb: fix an errata
 E-00013

On 2019-12-25 11:36, Biwen Li wrote:
> Specify a channel zero in idle state to
> avoid enterring tri-stated state for PCA9547.
> About E-00013:
> 	- Description: I2C1 and I2C3 buses
> 	  are missing pull-up.
> 	- Impact: When the PCA954x device is tri-stated, the I2C bus
> 	  will float. This makes the I2C bus and its associated
> 	  downstream devices inaccessible.
> 	- Hardware fix: Populate resistors R189 and R190 for I2C1
> 	  and resistors R228 and R229 for I2C3.
> 	- Software fix: Remove the tri-state option from the PCA954x
> 	  driver(PCA954x always on enable status, specify a
> 	  channel zero in dts to fix the errata E-00013).
> 
> Signed-off-by: Biwen Li <biwen.li@....com>

For this patch, get_maintainer.pl suggests a few more recipients that
you need to seek reviews/acks from.

Cheers,
Peter