Hi! This series tries to check the I2C device id, but instead of open coding the check in the pca954x driver, I have a new function in the core doing the work. Changes since v1: - Added Tested-by tag from Adrian - Added Reviewed-by tag from Wolfram - Replaced client->flags with a zero in the i2c_smbus_xfer call Wolfram: I'll send a pull with the first patch in a few days, to allow for a second round of feedback now that the RFC marker is gone. Cheers, peda Peter Rosin (2): i2c: add i2c_get_device_id() to get the standard i2c device id i2c: mux: pca954x: verify the device id of the pca984x chips drivers/i2c/i2c-core-base.c | 33 ++++++++++++++++++++++ drivers/i2c/muxes/i2c-mux-pca954x.c | 55 +++++++++++++++++++++++++++++++++---- include/linux/i2c.h | 30 ++++++++++++++++++++ 3 files changed, 112 insertions(+), 6 deletions(-) -- 2.11.0