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lf-6.6.y
linux-imx/Documentation/ABI/testing/sysfs-bus-cdx
Nipun Gupta 48a6c7bced cdx: add device attributes 
Create sysfs entry for CDX devices.

Sysfs entries provided in each of the CDX device detected by
the CDX controller
 - vendor id
 - device id
 - remove
 - reset of the device.
 - driver override

Signed-off-by: Puneet Gupta <puneet.gupta@amd.com>
Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Signed-off-by: Tarak Reddy <tarak.reddy@amd.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Tested-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Link: https://lore.kernel.org/r/20230313132636.31850-8-nipun.gupta@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-03-29 12:26:32 +02:00

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What: /sys/bus/cdx/rescan Date: March 2023 Contact: nipun.gupta@amd.com Description: Writing y/1/on to this file will cause rescan of the bus and devices on the CDX bus. Any new devices are scanned and added to the list of Linux devices and any devices removed are also deleted from Linux.

	For example::

	  # echo 1 > /sys/bus/cdx/rescan

What: /sys/bus/cdx/devices/.../vendor Date: March 2023 Contact: nipun.gupta@amd.com Description: Vendor ID for this CDX device, in hexadecimal. Vendor ID is 16 bit identifier which is specific to the device manufacturer. Combination of Vendor ID and Device ID identifies a device.

What: /sys/bus/cdx/devices/.../device Date: March 2023 Contact: nipun.gupta@amd.com Description: Device ID for this CDX device, in hexadecimal. Device ID is 16 bit identifier to identify a device type within the range of a device manufacturer. Combination of Vendor ID and Device ID identifies a device.

What: /sys/bus/cdx/devices/.../reset Date: March 2023 Contact: nipun.gupta@amd.com Description: Writing y/1/on to this file resets the CDX device. On resetting the device, the corresponding driver is notified twice, once before the device is being reset, and again after the reset has been complete.

	For example::

	  # echo 1 > /sys/bus/cdx/.../reset

What: /sys/bus/cdx/devices/.../remove Date: March 2023 Contact: tarak.reddy@amd.com Description: Writing y/1/on to this file removes the corresponding device from the CDX bus. If the device is to be reconfigured reconfigured in the Hardware, the device can be removed, so that the device driver does not access the device while it is being reconfigured.

	For example::

	  # echo 1 > /sys/bus/cdx/devices/.../remove