Hello,
This my first post in 10 years to the Xenomai group, just as the EVL project
comes online! I'm trying to get the xeno-gpio-xilinx driver working but am
encountering the following difficulties:
(1) It seems the standard non Xenomai gpio-xilinx driver SysFS are
prerequisites to making the driver work. Unlike the SJA1000 CAN Drivers I used
in the past which were standalone, I'm seeing a lot of clues that the Xeno GPIO
drivers need to piggyback on top of the core Linux Drivers. I guess this is a
change from when I last worked with Xenomai 10 years ago where I used
xeno-16550A and SJA1000 as RTSER and RTCAN drivers.
When I attempt to modprobe xeno-gpio-xilinx I receive a message stating:
modprobe: ERROR: could not insert 'xeno_gpio_xilinx': No such device
Device Tree:
# cat /proc/device-tree/axigpio@a0000000/compatible
xlnx,xps-gpio-1.00.a
In Xenomai gpio-xilinx.c:
return rtdm_gpiochip_scan_of(NULL, "xlnx,xps-gpio-1.00.a",
RTDM_SUBCLASS_XILINX);
I instrumented the Xenomai gpio-xilinx.c and gpio-core.c to see if the
of_find_compatible_node function fails and indeed it does find no such device.
Also I noted that there are no Xilinx specific registers in the gpio-core.c or
in gpio-xilinx.c, making me believe that this driver is piggybacking on top of
the Xilinx driver.
However: when I modprobe gpio-xilinx the of_find_compatible_node function no
longer fails, so I guess of_find_compatible_node works only with loaded drivers
/ GPIO Chips. The issue is, gpio-xilinx has already done the SYSFS
registration, so I get the following errors: Seems the driver wants to use
the same names for RT with SYSFS as non RT. The key error is "
kobject_add_internal failed for !axigpio@a0000000 with -EEXIST, d
on't try to register things with the same name in the same directory.
"
Thoughts?
Josh Karch
modprobe xeno-gpio-xilinx
[ 55.778656] test probing xilinx gpio rt
[ 55.782753] sysfs: cannot create duplicate filename '/class/!axigpio@a0000000
'
[ 55.789991] CPU: 1 PID: 237 Comm: modprobe Tainted: G W O 4.19.5
5 #8
[ 55.797470] Hardware name: ZynqMP ZCU102 Rev1.0 (DT)
[ 55.802422] I-pipe domain: Linux
[ 55.805643] Call trace:
[ 55.808090] dump_backtrace+0x0/0x160
[ 55.811748] show_stack+0x14/0x20
[ 55.815056] dump_stack+0xcc/0xf4
[ 55.818363] sysfs_warn_dup+0x60/0x80
[ 55.822016] sysfs_create_dir_ns+0xcc/0xf0
[ 55.826106] kobject_add_internal+0xac/0x2a0
[ 55.830367] kset_register+0x50/0x80
[ 55.833937] __class_register+0xbc/0x170
[ 55.837850] __class_create+0x50/0x90
[ 55.841507] rtdm_gpiochip_add+0x30/0x260
[ 55.845507] rtdm_gpiochip_alloc+0x50/0xe0
[ 55.849596] rtdm_gpiochip_scan_of.part.1+0x138/0x1e0
[ 55.854640] rtdm_gpiochip_scan_of+0x20/0x30
[ 55.858905] xilinx_gpio_init+0x28/0x1000 [xeno_gpio_xilinx]
[ 55.864554] do_one_initcall+0x74/0x178
[ 55.868382] do_init_module+0x54/0x1d0
[ 55.872122] load_module+0x1b90/0x2120
[ 55.875864] __se_sys_finit_module+0xb8/0xd0
[ 55.880127] __arm64_sys_finit_module+0x18/0x20
[ 55.884650] el0_svc_common+0xbc/0x1a0
[ 55.888390] el0_svc_handler+0x68/0x80
[ 55.892131] el0_svc+0x8/0x18
[ 55.895114] kobject_add_internal failed for !axigpio@a0000000 with -EEXIST, d
on't try to register things with the same name in the same directory.
[ 55.908254] [Xenomai] cannot create sysfs class
[ 55.912796] sysfs: cannot create duplicate filename '/class/!axigpio@a0000000
'
[ 55.920021] CPU: 1 PID: 237 Comm: modprobe Tainted: G W O 4.19.5
5 #8
[ 55.927500] Hardware name: ZynqMP ZCU102 Rev1.0 (DT)
[ 55.932453] I-pipe domain: Linux
[ 55.935672] Call trace:
[ 55.938115] dump_backtrace+0x0/0x160
[ 55.941769] show_stack+0x14/0x20
[ 55.945077] dump_stack+0xcc/0xf4
[ 55.948384] sysfs_warn_dup+0x60/0x80
[ 55.952038] sysfs_create_dir_ns+0xcc/0xf0
[ 55.956127] kobject_add_internal+0xac/0x2a0
[ 55.960389] kset_register+0x50/0x80
[ 55.963957] __class_register+0xbc/0x170
[ 55.967872] __class_create+0x50/0x90
[ 55.971527] rtdm_gpiochip_add+0x30/0x260
[ 55.975529] rtdm_gpiochip_alloc+0x50/0xe0
[ 55.979618] rtdm_gpiochip_scan_of.part.1+0x138/0x1e0
[ 55.984663] rtdm_gpiochip_scan_of+0x20/0x30
[ 55.988925] xilinx_gpio_init+0x28/0x1000 [xeno_gpio_xilinx]
[ 55.994576] do_one_initcall+0x74/0x178
[ 55.998403] do_init_module+0x54/0x1d0
[ 56.002144] load_module+0x1b90/0x2120
[ 56.005886] __se_sys_finit_module+0xb8/0xd0
[ 56.010149] __arm64_sys_finit_module+0x18/0x20
[ 56.014672] el0_svc_common+0xbc/0x1a0
[ 56.018412] el0_svc_handler+0x68/0x80
[ 56.022153] el0_svc+0x8/0x18
[ 56.025128] kobject_add_internal failed for !axigpio@a0000000 with -EEXIST, d
on't try to register things with the same name in the same directory.
[ 56.038263] [Xenomai] cannot create sysfs class
[ 56.042798] Xeno Scan returns -17
#
