All of lore.kernel.org
 help / color / mirror / Atom feed
From: Li Yang <leoyang.li@nxp.com>
To: shawnguo@kernel.org, devicetree@vger.kernel.org
Cc: robh+dt@kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Biwen Li <biwen.li@nxp.com>,
	Li Yang <leoyang.li@nxp.com>
Subject: [PATCH v4 4/5] arm64: dts: ls208xa-rdb: fix errata E-00013
Date: Wed, 14 Sep 2022 16:15:37 -0500	[thread overview]
Message-ID: <20220914211538.29473-5-leoyang.li@nxp.com> (raw)
In-Reply-To: <20220914211538.29473-1-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.

Some information 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 f8135c5c252d..3d9647b3da14 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>;
-- 
2.37.1


WARNING: multiple messages have this Message-ID (diff)
From: Li Yang <leoyang.li@nxp.com>
To: shawnguo@kernel.org, devicetree@vger.kernel.org
Cc: robh+dt@kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Biwen Li <biwen.li@nxp.com>,
	Li Yang <leoyang.li@nxp.com>
Subject: [PATCH v4 4/5] arm64: dts: ls208xa-rdb: fix errata E-00013
Date: Wed, 14 Sep 2022 16:15:37 -0500	[thread overview]
Message-ID: <20220914211538.29473-5-leoyang.li@nxp.com> (raw)
In-Reply-To: <20220914211538.29473-1-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.

Some information 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 f8135c5c252d..3d9647b3da14 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>;
-- 
2.37.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2022-09-14 21:16 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-14 21:15 [PATCH v4 0/5] ls208xa dts updates Li Yang
2022-09-14 21:15 ` Li Yang
2022-09-14 21:15 ` [PATCH v4 1/5] arm64: dts: ls208xa-qds: add mdio mux nodes from on-board FPGA Li Yang
2022-09-14 21:15   ` Li Yang
2022-09-14 21:15 ` [PATCH v4 2/5] arm64: dts: ls2080a-rdb: add phy nodes Li Yang
2022-09-14 21:15   ` Li Yang
2022-09-14 21:15 ` [PATCH v4 3/5] arm64: dts: ls2081a-rdb: Add DTS for NXP LS2081ARDB Li Yang
2022-09-14 21:15   ` Li Yang
2022-09-14 21:15 ` Li Yang [this message]
2022-09-14 21:15   ` [PATCH v4 4/5] arm64: dts: ls208xa-rdb: fix errata E-00013 Li Yang
2022-09-14 21:15 ` [PATCH v4 5/5] arm64: dts: ls208x: remove NXP Erratum A008585 from LS2088A Li Yang
2022-09-14 21:15   ` Li Yang
2022-09-16 12:10 ` [PATCH v4 0/5] ls208xa dts updates Shawn Guo
2022-09-16 12:10   ` Shawn Guo

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20220914211538.29473-5-leoyang.li@nxp.com \
    --to=leoyang.li@nxp.com \
    --cc=biwen.li@nxp.com \
    --cc=devicetree@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=robh+dt@kernel.org \
    --cc=shawnguo@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.