Hello there,
I am having difficulties with some xilinx gpios and the xilinx-2.6-xlnx
kernel. As far as I can tell the kernel is configured correctly for
gpio.
I can see that the module_init function "xgpio_init" is called, and that
bus_add_driver and driver_add_groups returns without error. But I cannot
see that the probe function is called. /proc/misc doesnt list a driver
for the gpios. I am not sure where to go next as there is no error
printouts.
I have seen other peoples consoles stating that the gpio is mapped to xx
but this doesn't happen for me.
I am using the default bit file for the ml507 board, and have created
device files
/dev/xgpio0
/dev/xgpio1 etc with major 10 and minor 185
However if I try to open these devices the open fails.
I would rally appreciate it if someone could give me some pointers as to
what to look for, or how a to go about debugging this.
Many thanks
Peter Scott
Hi Peter,
Sorry for the delay. Are you using arch/powerpc and the xilinx_gpio
driver from the Xilinx Git tree has not been converted to use device
tree yet?
We have a new gpio driver that we have not released out yet that is
flattened and designed to work with arch/powerpc. I have recently been
testing it with success in general.
However it is a new driver that is not a char driver as the old one, but
a true gpio driver that is accessed from sysfs in user space.
What are you trying to use the GPIO for?
Thanks,
John
________________________________
From: linuxppc-embedded-bounces+john.linn=xilinx.com@ozlabs.org
[mailto:linuxppc-embedded-bounces+john.linn=xilinx.com@ozlabs.org] On
Behalf Of Peter Scott
Sent: Monday, October 20, 2008 1:43 PM
To: linuxppc-embedded@ozlabs.org
Subject: Xilininx GPIO
Hello there,
I am having difficulties with some xilinx gpios and the xilinx-2.6-xlnx
kernel. As far as I can tell the kernel is configured correctly for
gpio.
I can see that the module_init function "xgpio_init" is called, and that
bus_add_driver and driver_add_groups returns without error. But I cannot
see that the probe function is called. /proc/misc doesnt list a driver
for the gpios. I am not sure where to go next as there is no error
printouts.
I have seen other peoples consoles stating that the gpio is mapped to xx
but this doesn't happen for me.
I am using the default bit file for the ml507 board, and have created
device files
/dev/xgpio0
/dev/xgpio1 etc with major 10 and minor 185
However if I try to open these devices the open fails.
I would rally appreciate it if someone could give me some pointers as to
what to look for, or how a to go about debugging this.
Many thanks
Peter Scott
This email and any attachments are intended for the sole use of the named recipient(s) and contain(s) confidential information that may be proprietary, privileged or copyrighted under applicable law. If you are not the intended recipient, do not read, copy, or forward this email message or any attachments. Delete this email message and any attachments immediately.