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author | Alan Tull <atull@opensource.altera.com> | 2015-10-07 16:36:27 +0100 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-07 18:07:20 +0100 |
commit | afb79e993a949d02895b912eacc86ab0e416b6fd (patch) | |
tree | 2c7805436193280ea0d18457521ecc9ccb2edc6a /Documentation | |
parent | e8f5fda1ad477f02bf82a50284acbd0f7f1364e3 (diff) | |
download | op-kernel-dev-afb79e993a949d02895b912eacc86ab0e416b6fd.zip op-kernel-dev-afb79e993a949d02895b912eacc86ab0e416b6fd.tar.gz |
fpga manager: add sysfs interface document
Add documentation under drivers/staging for new fpga manager's
sysfs interface.
Signed-off-by: Alan Tull <atull@opensource.altera.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/ABI/testing/sysfs-class-fpga-manager | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-fpga-manager b/Documentation/ABI/testing/sysfs-class-fpga-manager new file mode 100644 index 0000000..23056c5 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-fpga-manager @@ -0,0 +1,37 @@ +What: /sys/class/fpga_manager/<fpga>/name +Date: August 2015 +KernelVersion: 4.3 +Contact: Alan Tull <atull@opensource.altera.com> +Description: Name of low level fpga manager driver. + +What: /sys/class/fpga_manager/<fpga>/state +Date: August 2015 +KernelVersion: 4.3 +Contact: Alan Tull <atull@opensource.altera.com> +Description: Read fpga manager state as a string. + The intent is to provide enough detail that if something goes + wrong during FPGA programming (something that the driver can't + fix) then userspace can know, i.e. if the firmware request + fails, that could be due to not being able to find the firmware + file. + + This is a superset of FPGA states and fpga manager driver + states. The fpga manager driver is walking through these steps + to get the FPGA into a known operating state. It's a sequence, + though some steps may get skipped. Valid FPGA states will vary + by manufacturer; this is a superset. + + * unknown = can't determine state + * power off = FPGA power is off + * power up = FPGA reports power is up + * reset = FPGA held in reset state + * firmware request = firmware class request in progress + * firmware request error = firmware request failed + * write init = preparing FPGA for programming + * write init error = Error while preparing FPGA for + programming + * write = FPGA ready to receive image data + * write error = Error while programming + * write complete = Doing post programming steps + * write complete error = Error while doing post programming + * operating = FPGA is programmed and operating |