From: Chris Packham <chris.packham@alliedtelesis.co.nz>
To: wsa@kernel.org, andriy.shevchenko@linux.intel.com,
andy.shevchenko@gmail.com, robh+dt@kernel.org,
mpe@ellerman.id.au
Cc: linux-i2c@vger.kernel.org, devicetree@vger.kernel.org,
linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
Chris Packham <chris.packham@alliedtelesis.co.nz>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>
Subject: [PATCH v2 2/3] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers
Date: Fri, 7 May 2021 12:40:46 +1200 [thread overview]
Message-ID: <20210507004047.4454-3-chris.packham@alliedtelesis.co.nz> (raw)
In-Reply-To: <20210507004047.4454-1-chris.packham@alliedtelesis.co.nz>
The i2c controllers on the P2040/P2041 have an erratum where the
documented scheme for i2c bus recovery will not work (A-004447). A
different mechanism is needed which is documented in the P2040 Chip
Errata Rev Q (latest available at the time of writing).
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
---
arch/powerpc/boot/dts/fsl/p2041si-post.dtsi | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi b/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
index 872e4485dc3f..ddc018d42252 100644
--- a/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
+++ b/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
@@ -371,7 +371,23 @@ sdhc@114000 {
};
/include/ "qoriq-i2c-0.dtsi"
+ i2c@118000 {
+ fsl,i2c-erratum-a004447;
+ };
+
+ i2c@118100 {
+ fsl,i2c-erratum-a004447;
+ };
+
/include/ "qoriq-i2c-1.dtsi"
+ i2c@119000 {
+ fsl,i2c-erratum-a004447;
+ };
+
+ i2c@119100 {
+ fsl,i2c-erratum-a004447;
+ };
+
/include/ "qoriq-duart-0.dtsi"
/include/ "qoriq-duart-1.dtsi"
/include/ "qoriq-gpio-0.dtsi"
--
2.31.1
next prev parent reply other threads:[~2021-05-07 0:40 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-07 0:40 [PATCH v2 0/3] P2040/P2041 i2c recovery erratum Chris Packham
2021-05-07 0:40 ` [PATCH v2 1/3] dt-bindings: i2c: mpc: Add fsl,i2c-erratum-a004447 flag Chris Packham
2021-05-07 21:49 ` Rob Herring
2021-05-09 21:08 ` Chris Packham
2021-05-11 15:33 ` Rob Herring
2021-05-07 0:40 ` Chris Packham [this message]
2021-05-07 8:04 ` [PATCH v2 2/3] powerpc/fsl: set fsl, i2c-erratum-a004447 flag for P2041 i2c controllers Joakim Tjernlund
2021-05-07 8:24 ` Joakim Tjernlund
2021-05-09 21:11 ` Chris Packham
2021-05-07 0:40 ` [PATCH v2 3/3] i2c: mpc: implement erratum A-004447 workaround Chris Packham
2021-05-07 11:46 ` Andy Shevchenko
2021-05-07 14:52 ` Joakim Tjernlund
2021-05-07 15:36 ` Andy Shevchenko
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=20210507004047.4454-3-chris.packham@alliedtelesis.co.nz \
--to=chris.packham@alliedtelesis.co.nz \
--cc=andriy.shevchenko@linux.intel.com \
--cc=andy.shevchenko@gmail.com \
--cc=benh@kernel.crashing.org \
--cc=devicetree@vger.kernel.org \
--cc=linux-i2c@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mpe@ellerman.id.au \
--cc=paulus@samba.org \
--cc=robh+dt@kernel.org \
--cc=wsa@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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).