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
