linux-kernel - [PATCH v2 2/3] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers

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Message-Id: <20210507004047.4454-3-chris.packham@alliedtelesis.co.nz>
Date:   Fri,  7 May 2021 12:40:46 +1200
From:   Chris Packham <chris.packham@...iedtelesis.co.nz>
To:     wsa@...nel.org, andriy.shevchenko@...ux.intel.com,
        andy.shevchenko@...il.com, robh+dt@...nel.org, mpe@...erman.id.au
Cc:     linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>
Subject: [PATCH v2 2/3] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers

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@...iedtelesis.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@...000 {
 	};
 
 /include/ "qoriq-i2c-0.dtsi"
+	i2c@...000 {
+		fsl,i2c-erratum-a004447;
+	};
+
+	i2c@...100 {
+		fsl,i2c-erratum-a004447;
+	};
+
 /include/ "qoriq-i2c-1.dtsi"
+	i2c@...000 {
+		fsl,i2c-erratum-a004447;
+	};
+
+	i2c@...100 {
+		fsl,i2c-erratum-a004447;
+	};
+
 /include/ "qoriq-duart-0.dtsi"
 /include/ "qoriq-duart-1.dtsi"
 /include/ "qoriq-gpio-0.dtsi"
-- 
2.31.1