What: /sys/bus/i3c/devices/i3c- KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: An I3C bus. This directory will contain one sub-directory per I3C device present on the bus. What: /sys/bus/i3c/devices/i3c-/current_master KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: Expose the master that owns the bus (-) at the time this file is read. Note that bus ownership can change overtime, so there's no guarantee that when the read() call returns, the value returned is still valid. What: /sys/bus/i3c/devices/i3c-/mode KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: I3C bus mode. Can be "pure", "mixed-fast" or "mixed-slow". See the I3C specification for a detailed description of what each of these modes implies. What: /sys/bus/i3c/devices/i3c-/i3c_scl_frequency KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: The frequency (expressed in Hz) of the SCL signal when operating in I3C SDR mode. What: /sys/bus/i3c/devices/i3c-/i2c_scl_frequency KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: The frequency (expressed in Hz) of the SCL signal when operating in I2C mode. What: /sys/bus/i3c/devices/i3c-/dynamic_address KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: Dynamic address assigned to the master controller. This address may change if the bus is re-initialized. What: /sys/bus/i3c/devices/i3c-/bcr KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: BCR stands for Bus Characteristics Register and express the device capabilities in term of speed, maximum read/write length, etc. See the I3C specification for more details. This entry describes the BCR of the master controller driving the bus. What: /sys/bus/i3c/devices/i3c-/dcr KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: DCR stands for Device Characteristics Register and express the device capabilities in term of exposed features. See the I3C specification for more details. This entry describes the DCR of the master controller driving the bus. What: /sys/bus/i3c/devices/i3c-/pid KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: PID stands for Provisioned ID and is used to uniquely identify a device on a bus. This PID contains information about the vendor, the part and an instance ID so that several devices of the same type can be connected on the same bus. See the I3C specification for more details. This entry describes the PID of the master controller driving the bus. What: /sys/bus/i3c/devices/i3c-/hdrcap KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: Expose the HDR (High Data Rate) capabilities of a device. Returns a list of supported HDR mode, each element is separated by space. Modes can be "hdr-ddr", "hdr-tsp" and "hdr-tsl". See the I3C specification for more details about these HDR modes. This entry describes the HDRCAP of the master controller driving the bus. What: /sys/bus/i3c/devices/i3c-/hotjoin KernelVersion: 6.8 Contact: linux-i3c@vger.kernel.org Description: I3C’s Hot-Join mechanism allows an I3C Device to inform the Active Controller that a newly-joined Target is present on the I3C Bus and is ready to receive a Dynamic Address, in order to become fully functional on the Bus. Hot-Join is used when the Target is mounted on the same I3C bus and remains depowered until needed or until the Target is physically inserted into the I3C bus This entry allows to enable or disable Hot-join of the Current Controller driving the bus. What: /sys/bus/i3c/devices/i3c-/- KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: An I3C device present on I3C bus identified by . Note that all devices are represented including the master driving the bus. What: /sys/bus/i3c/devices/i3c-/-/dynamic_address KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: Dynamic address assigned to device -. This address may change if the bus is re-initialized. What: /sys/bus/i3c/devices/i3c-/-/bcr KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: BCR stands for Bus Characteristics Register and express the device capabilities in term of speed, maximum read/write length, etc. See the I3C specification for more details. What: /sys/bus/i3c/devices/i3c-/-/dcr KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: DCR stands for Device Characteristics Register and express the device capabilities in term of exposed features. See the I3C specification for more details. What: /sys/bus/i3c/devices/i3c-/-/pid KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: PID stands for Provisioned ID and is used to uniquely identify a device on a bus. This PID contains information about the vendor, the part and an instance ID so that several devices of the same type can be connected on the same bus. See the I3C specification for more details. What: /sys/bus/i3c/devices/i3c-/-/hdrcap KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: Expose the HDR (High Data Rate) capabilities of a device. Returns a list of supported HDR mode, each element is separated by space. Modes can be "hdr-ddr", "hdr-tsp" and "hdr-tsl". See the I3C specification for more details about these HDR modes. What: /sys/bus/i3c/devices/- KernelVersion: 5.0 Contact: linux-i3c@vger.kernel.org Description: These directories are just symbolic links to /sys/bus/i3c/devices/i3c-/-.