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linuxkpi: Add `to_acpi_device_node()` and `ACPI_COMPANION()`
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Authored by dumbbell on Sun, Jun 14, 9:19 AM.
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Summary

The former is called by the latter. We return NULL because linuxkpi does not implement ACPI (pseudo?) devices associated to regular devices.

The amdgpu DRM driver started to use ACPI_COMPANION() in Linux 6.13.

This is part of the update of DRM drivers to Linux 6.13.

Sponsored by: The FreeBSD Foundation

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rG FreeBSD src repository
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