On 2019-12-25 11:36, Biwen Li wrote: > This supports property idle-state,if present, > overrides i2c-mux-idle-disconnect. > > My use cases: > - Use the property idle-state to fix > an errata on LS2085ARDB and LS2088ARDB. > - Errata id: E-00013(board LS2085ARDB and > LS2088ARDB revision on Rev.B, Rev.C and Rev.D). > - About E-00013: > - Description: I2C1 and I2C3 buses > are missing pull-up. > - Impact: When the PCA954x device is tri-stated, the I2C bus > will float. This makes the I2C bus and its associated > downstream devices inaccessible. > - Hardware fix: Populate resistors R189 and R190 for I2C1 > and resistors R228 and R229 for I2C3. > - Software fix: Remove the tri-state option from the PCA954x > driver(PCA954x always on enable status, specify a > channel zero in dts to fix the errata E-00013). > > Tested-by: Ioana Ciornei <ioana.ciornei@xxxxxxx> > Signed-off-by: Biwen Li <biwen.li@xxxxxxx> Pushed to i2c-mux/for-next with some minor language tweaks. Cheers, Peter
