From: Li Yang <leoyang.li@nxp.com>
To: Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
Rob Herring <robh+dt@kernel.org>
Cc: Biwen Li <biwen.li@nxp.com>,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 5/6] arm64: dts: ls208xa-rdb: fix errata E-00013
Date: Thu, 17 Mar 2022 14:01:08 -0500 [thread overview]
Message-ID: <20220317190109.3742-5-leoyang.li@nxp.com> (raw)
In-Reply-To: <20220317190109.3742-1-leoyang.li@nxp.com>
From: Biwen Li <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>
Signed-off-by: Li Yang <leoyang.li@nxp.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
WARNING: multiple messages have this Message-ID (diff)
From: Li Yang <leoyang.li@nxp.com>
To: Shawn Guo <shawnguo@kernel.org>, Li Yang <leoyang.li@nxp.com>,
Rob Herring <robh+dt@kernel.org>
Cc: Biwen Li <biwen.li@nxp.com>,
linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 5/6] arm64: dts: ls208xa-rdb: fix errata E-00013
Date: Thu, 17 Mar 2022 14:01:08 -0500 [thread overview]
Message-ID: <20220317190109.3742-5-leoyang.li@nxp.com> (raw)
In-Reply-To: <20220317190109.3742-1-leoyang.li@nxp.com>
From: Biwen Li <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>
Signed-off-by: Li Yang <leoyang.li@nxp.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
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next prev parent reply other threads:[~2022-03-17 19:01 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-17 19:01 [PATCH 1/6] arm64: dts: ls2080a-qds: add mdio mux nodes from on-board FPGA Li Yang
2022-03-17 19:01 ` Li Yang
2022-03-17 19:01 ` [PATCH 2/6] arm64: dts: ls2088a-qds: " Li Yang
2022-03-17 19:01 ` Li Yang
2022-03-17 19:01 ` [PATCH 3/6] arm64: dts: ls2080a-rdb: add phy nodes Li Yang
2022-03-17 19:01 ` Li Yang
2022-04-10 1:12 ` Shawn Guo
2022-04-10 1:12 ` Shawn Guo
2022-03-17 19:01 ` [PATCH 4/6] arm64: dts: ls2081a-rdb: Add DTS support for NXP LS2081ARDB Li Yang
2022-03-17 19:01 ` Li Yang
2022-04-10 1:19 ` Shawn Guo
2022-04-10 1:19 ` Shawn Guo
2022-03-17 19:01 ` Li Yang [this message]
2022-03-17 19:01 ` [PATCH 5/6] arm64: dts: ls208xa-rdb: fix errata E-00013 Li Yang
2022-04-10 1:25 ` Shawn Guo
2022-04-10 1:25 ` Shawn Guo
2022-03-17 19:01 ` [PATCH 6/6] arm64: dts: ls208x: remove NXP Erratum A008585 from LS2088A Li Yang
2022-03-17 19:01 ` Li Yang
2022-04-10 1:27 ` Shawn Guo
2022-04-10 1:27 ` Shawn Guo
2022-04-10 1:10 ` [PATCH 1/6] arm64: dts: ls2080a-qds: add mdio mux nodes from on-board FPGA Shawn Guo
2022-04-10 1:10 ` Shawn Guo
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