From: Peter Rosin <peda@axentia.se>
To: Biwen Li <biwen.li@nxp.com>,
"leoyang.li@nxp.com" <leoyang.li@nxp.com>,
"robh+dt@kernel.org" <robh+dt@kernel.org>,
"mark.rutland@arm.com" <mark.rutland@arm.com>
Cc: "linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>
Subject: Re: [RESEND v6,2/3] i2c: mux: pca954x: support property idle-state
Date: Fri, 3 Jan 2020 14:06:14 +0000 [thread overview]
Message-ID: <93a63ac2-eb96-725a-0856-081c332c2b86@axentia.se> (raw)
In-Reply-To: <20191225103624.48342-2-biwen.li@nxp.com>
On 2019-12-25 11:36, Biwen Li wrote:
> This supports property idle-state,if present,
> overrides i2c-mux-idle-disconnect.
>
> My use cases:
> - Use the property idle-state to fix
> an errata on LS2085ARDB and LS2088ARDB.
> - Errata id: E-00013(board LS2085ARDB and
> LS2088ARDB revision on Rev.B, Rev.C and Rev.D).
> - 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).
>
> Tested-by: Ioana Ciornei <ioana.ciornei@nxp.com>
> Signed-off-by: Biwen Li <biwen.li@nxp.com>
Pushed to i2c-mux/for-next with some minor language tweaks.
Cheers,
Peter
next prev parent reply other threads:[~2020-01-03 14:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-25 10:36 [RESEND v6,1/3] dt-bindings: i2c: support property idle-state Biwen Li
2019-12-25 10:36 ` [RESEND v6,2/3] i2c: mux: pca954x: " Biwen Li
2020-01-03 14:06 ` Peter Rosin [this message]
2019-12-25 10:36 ` [RESEND v6,3/3] arm64: dts: fsl-ls208xa-rdb: fix an errata E-00013 Biwen Li
2020-01-03 14:09 ` Peter Rosin
2020-01-03 14:05 ` [RESEND v6,1/3] dt-bindings: i2c: support property idle-state Peter Rosin
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