linux-kernel - [PATCH 5/6] arm64: dts: ls208xa-rdb: fix errata E-00013

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Message-Id: <20220317190109.3742-5-leoyang.li@nxp.com>
Date:   Thu, 17 Mar 2022 14:01:08 -0500
From:   Li Yang <leoyang.li@....com>
To:     Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     Biwen Li <biwen.li@....com>, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/6] arm64: dts: ls208xa-rdb: fix errata E-00013

From: Biwen Li <biwen.li@....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@....com>
Signed-off-by: Li Yang <leoyang.li@....com>
---
 arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi b/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi
index 4b71c4fcb35f..a752f06a2e74 100644
--- a/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi
+++ b/arch/arm64/boot/dts/freescale/fsl-ls208xa-rdb.dtsi
@@ -49,6 +49,8 @@ pca9547@75 {
 		reg = <0x75>;
 		#address-cells = <1>;
 		#size-cells = <0>;
+		idle-state = <0>;
+
 		i2c@1 {
 			#address-cells = <1>;
 			#size-cells = <0>;
-- 
2.25.1