linux-kernel - [PATCH AUTOSEL 4.14 18/18] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P1010 i2c controllers

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Message-Id: <20210603171029.3169669-18-sashal@kernel.org>
Date:   Thu,  3 Jun 2021 13:10:29 -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 18/18] powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P1010 i2c controllers

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

[ Upstream commit 19ae697a1e4edf1d755b413e3aa38da65e2db23b ]

The i2c controllers on the P1010 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 P1010 Chip Errata Rev L.

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/p1010si-post.dtsi | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi b/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
index af12ead88c5f..404f570ebe23 100644
--- a/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
+++ b/arch/powerpc/boot/dts/fsl/p1010si-post.dtsi
@@ -122,7 +122,15 @@ memory-controller@...0 {
 	};
 
 /include/ "pq3-i2c-0.dtsi"
+	i2c@...0 {
+		fsl,i2c-erratum-a004447;
+	};
+
 /include/ "pq3-i2c-1.dtsi"
+	i2c@...0 {
+		fsl,i2c-erratum-a004447;
+	};
+
 /include/ "pq3-duart-0.dtsi"
 /include/ "pq3-espi-0.dtsi"
 	spi0: spi@...0 {
-- 
2.30.2