Document that acpi_dev_state_d0() can be used to tell if the device was powered on for probe. Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx> --- Documentation/firmware-guide/acpi/non-d0-probe.rst | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/firmware-guide/acpi/non-d0-probe.rst b/Documentation/firmware-guide/acpi/non-d0-probe.rst index 7afd16701a02..815bcc8db69f 100644 --- a/Documentation/firmware-guide/acpi/non-d0-probe.rst +++ b/Documentation/firmware-guide/acpi/non-d0-probe.rst @@ -24,6 +24,14 @@ there's a problem with the device, the driver likely probes just fine but the first user will find out the device doesn't work, instead of a failure at probe time. This feature should thus be used sparingly. +ACPI framework +-------------- + +Use the Linux ACPI framework function :c:func:`acpi_dev_state_d0()` to tell +whether the device was powered on for probe. :c:func:`acpi_dev_state_d0()` +returns true if the device is powered on, false otherwise. For non-ACPI backed +devices it returns true always. + I²C --- -- 2.39.2
