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SubjectRe: [PATCH v3] i2c: i801: Safely share SMBus with BIOS/ACPI
Tested on a SECO SBC-B68 and a UDOO X86.
The BIOS AML code queries the Embedded Controller over SMBus,
respecting the hardware semaphore implementation.

I get this line on kernel log and everything works as expected.
[ 7.270172] i801_smbus 0000:00:1f.3: SMBus controller is shared with ACPI AML. This seems safe so far.

Tested with continous use of i2c-tools (i2cdump) with temperature reads
in thermal_zone (that triggers AML code).

Tested-by: Ettore Chimenti <>

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