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doc: document adapter drivers linuxgpiod and sysfsgpio 

Change-Id: If894092a7ae04bb95fa1913d2e3c8465c2d0f75c
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5961
Tested-by: jenkins
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
This commit is contained in:
Antonio Borneo 2020-12-06 18:19:01 +01:00
parent 2bbd85a828
commit 9d3f337570
1 changed files with 23 additions and 0 deletions

23
doc/openocd.texi
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@ -623,6 +623,13 @@ emulation model of target hardware.
@item @b{xlnx_pcie_xvc}
@* A JTAG driver exposing Xilinx Virtual Cable over PCI Express to OpenOCD as JTAG/SWD interface.
@item @b{linuxgpiod}
@* A bitbang JTAG driver using Linux GPIO through library libgpiod.
@item @b{sysfsgpio}
@* A bitbang JTAG driver using Linux legacy sysfs GPIO.
This is deprecated from Linux v5.3; prefer using @b{linuxgpiod}.
@end itemize
@node About Jim-Tcl
@ -3240,6 +3247,22 @@ pinout.
@end deffn
@deffn {Interface Driver} {linuxgpiod}
Linux provides userspace access to GPIO through libgpiod since Linux kernel version v4.6.
The driver emulates either JTAG and SWD transport through bitbanging.
See @file{interface/dln-2-gpiod.cfg} for a sample config.
@end deffn
@deffn {Interface Driver} {sysfsgpio}
Linux legacy userspace access to GPIO through sysfs is deprecated from Linux kernel version v5.3.
Prefer using @b{linuxgpiod}, instead.
See @file{interface/sysfsgpio-raspberrypi.cfg} for a sample config.
@end deffn
@deffn {Interface Driver} {openjtag}
OpenJTAG compatible USB adapter.
This defines some driver-specific commands: