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| author | Abhijit Gangurde <abhijit.gangurde@amd.com> | 2023-10-17 21:35:03 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-10-27 13:23:24 +0200 |
| commit | e3cfd49cb9491ac1cc233a4b9e098688b4ab281d (patch) | |
| tree | 15029eab27a1d6205226fa16d723222bb7363d84 /Documentation/ABI/testing/sysfs-bus-cdx | |
| parent | ce558a391d80b9f47a462107977e8e81fe2f2962 (diff) | |
| download | linux-e3cfd49cb9491ac1cc233a4b9e098688b4ab281d.tar.gz linux-e3cfd49cb9491ac1cc233a4b9e098688b4ab281d.tar.bz2 linux-e3cfd49cb9491ac1cc233a4b9e098688b4ab281d.zip | |
cdx: add support for bus enable and disable
CDX bus needs to be disabled before updating/writing devices
in the FPGA. Once the devices are written, the bus shall be
rescanned. This change provides sysfs entry to enable/disable the
CDX bus.
Co-developed-by: Nipun Gupta <nipun.gupta@amd.com>
Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Signed-off-by: Abhijit Gangurde <abhijit.gangurde@amd.com>
Link: https://lore.kernel.org/r/20231017160505.10640-6-abhijit.gangurde@amd.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-bus-cdx')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-cdx | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-cdx b/Documentation/ABI/testing/sysfs-bus-cdx index 7af477f49998..c12bdaa4152a 100644 --- a/Documentation/ABI/testing/sysfs-bus-cdx +++ b/Documentation/ABI/testing/sysfs-bus-cdx @@ -28,6 +28,19 @@ Description: of a device manufacturer. Combination of Vendor ID and Device ID identifies a device. +What: /sys/bus/cdx/devices/.../enable +Date: October 2023 +Contact: abhijit.gangurde@amd.com +Description: + CDX bus should be disabled before updating the devices in FPGA. + Writing n/0/off will attempt to disable the CDX bus and. + writing y/1/on will attempt to enable the CDX bus. Reading this file + gives the current state of the bus, 1 for enabled and 0 for disabled. + + For example:: + + # echo 1 > /sys/bus/cdx/.../enable + What: /sys/bus/cdx/devices/.../reset Date: March 2023 Contact: nipun.gupta@amd.com |