Re: [PATCH v3 0/4] P2040/P2041 i2c recovery erratum
From: Joakim Tjernlund <hidden>
Date: 2021-05-11 22:10:25
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linux-devicetree, linux-i2c, lkml
On Wed, 2021-05-12 at 09:20 +1200, Chris Packham wrote:
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 (4): dt-bindings: i2c: mpc: Add fsl,i2c-erratum-a004447 flag powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P2041 i2c controllers powerpc/fsl: set fsl,i2c-erratum-a004447 flag for P1010 i2c controllers i2c: mpc: implement erratum A-004447 workaround .../devicetree/bindings/i2c/i2c-mpc.yaml | 7 ++ arch/powerpc/boot/dts/fsl/p1010si-post.dtsi | 8 ++ arch/powerpc/boot/dts/fsl/p2041si-post.dtsi | 16 ++++ drivers/i2c/busses/i2c-mpc.c | 81 ++++++++++++++++++- 4 files changed, 110 insertions(+), 2 deletions(-)
This now reminds me about the current I2C reset procedure, it didn't work for us and I came up with this one: https://www.spinics.net/lists/linux-i2c/msg29490.html it never got in but we are still using it. Jocke