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linux-yocto/Documentation/ABI/testing/sysfs-devices-waiting_for_supplier
Saravana Kannan da6d647598 driver core: Add waiting_for_supplier sysfs file for devices 
This would be useful to check if a device is not probing because it's
waiting for a supplier to be added and then linked to before it can
probe.

To reduce sysfs clutter, this file is added only if it can ever be 1.
So, if fw_devlink is disabled or set to permissive, this file is not
added. Also, this file is removed once the device probes as it's no
longer relevant.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20200521191800.136035-4-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-10 15:24:56 +02:00

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What: /sys/devices/.../waiting_for_supplier Date: May 2020 Contact: Saravana Kannan saravanak@google.com Description: The /sys/devices/.../waiting_for_supplier attribute is only present when fw_devlink kernel command line option is enabled and is set to something stricter than "permissive". It is removed once a device probes successfully (because the information is no longer relevant). The number read from it (0 or 1) reflects whether the device is waiting for one or more suppliers to be added and then linked to using device links before the device can probe.

	A value of 0 means the device is not waiting for any suppliers
	to be added before it can probe.  A value of 1 means the device
	is waiting for one or more suppliers to be added before it can
	probe.