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I2C devices can be added to the system dynamically through several sources other than static board info including device tree overlays and sysfs i2c new_device. Add an I2C bus notifier to attach the clients at runtime if they were not defined in the board info. For DT devices find the LVR in the reg property, for user-space new_device additions we synthesize a conservative setting of no spike filters and fast mode only. Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Jamie Iles <quic_jiles@quicinc.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Link: https://lore.kernel.org/r/20220117174816.1963463-3-quic_jiles@quicinc.com