Query regarding i2c-scmi not creating the right adapter

Query regarding i2c-scmi not creating the right adapter

[Andrea Costanzo]

Dear Linux Kernel mailing list,

I have been trying to compile and load the i2c-scmi and i2c_piix4 in my 
system.

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