linux-kernel - [PATCH AUTOSEL 4.14 17/18] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers

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Message-Id: <20210603171029.3169669-17-sashal@kernel.org>
Date:   Thu,  3 Jun 2021 13:10:28 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Chris Packham <chris.packham@...iedtelesis.co.nz>,
        Michael Ellerman <mpe@...erman.id.au>,
        Wolfram Sang <wsa@...nel.org>, Sasha Levin <sashal@...nel.org>,
        devicetree@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: [PATCH AUTOSEL 4.14 17/18] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers

From: Chris Packham <chris.packham@...iedtelesis.co.nz>

[ Upstream commit 7adc7b225cddcfd0f346d10144fd7a3d3d9f9ea7 ]

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>
Acked-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Wolfram Sang <wsa@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 51e975d7631a..8921f17fca42 100644
--- a/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
+++ b/arch/powerpc/boot/dts/fsl/p2041si-post.dtsi
@@ -389,7 +389,23 @@ 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"
-- 
2.30.2