On Jan 29, 2026, at 2:43 PM, Andrew Lunn [off-list ref] wrote:

On Thu, Jan 29, 2026 at 09:43:13PM +0000, Abdurrahman Hussain via B4 Relay wrote:

quoted

From: Abdurrahman Hussain <abdurrahman@nexthop.ai>

The xiic driver supports operation without explicit clock configuration
when clocks cannot be specified via firmware, such as on ACPI-based
systems.

Are you saying it is technically impossible to specify a clock in
ACPI?

Maybe a more accurate would be:

The xiic driver supports operation without explicit clock
configuration when the clocks are not specified via firmware, such as
when the ACPI tables are missing the description of the clocks.

Andrew

Actually, ACPI (since 6.5) added a ClockInput() macro that can be added to
_CRS of a device node. The ACPI subsystem in kernel could parse these and
convert into proper clocks integrated with the CCF. But, AFAIK, this idea was
rejected in the past. So, technically, it's the kernel that lacks support on
ACPI systems.

What about this wording then:

The xiic driver supports operation without explicit clock configuration when
the clocks specified via firmware are ignored, such as on ACPI systems.

Abdurrahman