linux-kernel - [PATCH 0/3] P2040/P2041 i2c recovery erratum

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Message-Id: <20210506011015.17347-1-chris.packham@alliedtelesis.co.nz>
Date:   Thu,  6 May 2021 13:10:11 +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>
Subject: [PATCH 0/3] P2040/P2041 i2c recovery erratum

The P2040/P2041 has an erratum where the i2c recovery scheme
documented in the reference manual (and currently implemented
in the i2c-mpc.c driver) does not work. The errata document
provides an alternative that does work. This series implements
that alternative and uses a property in the devicetree to
decide when the alternative mechanism is needed.

Chris Packham (3):
  dt-bindings: i2c: mpc: Add fsl,i2c-erratum-a004447 flag
  powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c
    controllers
  i2c: mpc: implement erratum A-004447 workaround

 .../devicetree/bindings/i2c/i2c-mpc.yaml      |  7 ++
 arch/powerpc/boot/dts/fsl/p2041si-post.dtsi   | 16 ++++
 drivers/i2c/busses/i2c-mpc.c                  | 88 ++++++++++++++++++-
 3 files changed, 109 insertions(+), 2 deletions(-)

-- 
2.31.1