From: Biwen Li <biwen.li@nxp.com>
To: peda@axentia.se, leoyang.li@nxp.com, robh+dt@kernel.org,
mark.rutland@arm.com
Cc: linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,
devicetree@vger.kernel.org, Biwen Li <biwen.li@nxp.com>
Subject: [v6,3/3] arm64: dts: fsl-ls208xa-rdb: fix an errata E-00013
Date: Fri, 29 Nov 2019 17:22:22 +0800 [thread overview]
Message-ID: <20191129092222.2706-3-biwen.li@nxp.com> (raw)
In-Reply-To: <20191129092222.2706-1-biwen.li@nxp.com>
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@nxp.com>
---
Change in v6:
- none
Change in v5:
- specify a channel zero when pca9547 in idle state.
arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi
index 6fd7f63085c9..412f1bc0db5f 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi
@@ -49,6 +49,7 @@
reg = <0x75>;
#address-cells = <1>;
#size-cells = <0>;
+ idle-state = <0>;
i2c@1 {
#address-cells = <1>;
#size-cells = <0>;
--
2.17.1
next prev parent reply other threads:[~2019-11-29 9:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-29 9:22 [v6,1/3] dt-bindings: i2c: support property idle-state Biwen Li
2019-11-29 9:22 ` [v6,2/3] i2c: mux: pca954x: " Biwen Li
2019-11-29 9:22 ` Biwen Li [this message]
2019-12-02 23:15 ` [v6,1/3] dt-bindings: i2c: " Rob Herring
2019-12-03 11:11 ` [EXT] " Biwen Li
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