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I am using a yocto kirkstone linux distribution. The overall project is to be able to read some voltages and temperature from the nuvoton chip nct7802. I have set to build as modules the following driver in my yocto distribution. CONFIG_I2C_PIIX4=m => enable i2c_piix4 module CONFIG_I2C_SCMI=m => enable i2c_scmi module CONFIG_SENSORS_NCT7802=m => enable the nuvoton chip driver nct7802 When I run my system with the new modules loaded and I scan all i2c busses (i2cdetect -l) I do not see the SMBUS CMI adapter loaded in any of the i2c devices. This means the i2c_scmi driver failed to bring up the adapter. Instead when I run on the same product an ubuntu distribution and I scan all the i2c bus with the same command I can see the following output on the i2c0 i2c-0 unknown SMBUS CMI adapter cmi   N/A ..... I have tried to add some printk messages on the i2c_scmi probe function but I do not see the printk messages on the dmesg output. the smbus adapter is physically connected to the pci bus in my system as I can see it when I run the lspci command > lspci -v -t -[0000:00]-+-00.0  Advanced Micro Devices, Inc. [AMD] Raven/Raven2 Root Complex            +-01.0  Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge            +-01.1-[01]----00.0  Xilinx Corporation Device b03f            +-01.3-[02]----00.0  Sandisk Corp Device 501a            +-01.6-[03]----00.0  Intel Corporation I210 Gigabit Network Connection            +-01.7-[04]----00.0  Intel Corporation I211 Gigabit Network Connection            +-08.0  Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge            +-08.1-[05]--+-00.0  Advanced Micro Devices, Inc. [AMD/ATI] Raven Ridge [Radeon Vega Series / Radeon Vega Mobile Series]            |            +-00.1  Advanced Micro Devices, Inc. [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio Controller            |            +-00.2  Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) Platform Security Processor            |            +-00.3  Advanced Micro Devices, Inc. [AMD] Raven USB 3.1            |            +-00.4  Advanced Micro Devices, Inc. [AMD] Raven USB 3.1            |            +-00.5  Advanced Micro Devices, Inc. [AMD] Raven/Raven2/FireFlight/Renoir Audio Processor            |            +-00.6  Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh) HD Audio Controller            |            \-00.7  Advanced Micro Devices, Inc. [AMD] Raven/Raven2/Renoir Non-Sensor Fusion Hub KMDF driver            +-08.2-[06]----00.0  Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] *           +-14.0  Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller ->This is the SMBUS Controller adapter * .... Do you have some suggestion to nail down where it can be the problem? Many Thanks Andrea