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<title>Xilininx GPIO</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hi Peter,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>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. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>What are you trying to use the GPIO for? <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>John<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
linuxppc-embedded-bounces+john.linn=xilinx.com@ozlabs.org [mailto:linuxppc-embedded-bounces+john.linn=xilinx.com@ozlabs.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Peter Scott<br>
<b><span style='font-weight:bold'>Sent:</span></b> Monday, October 20, 2008
1:43 PM<br>
<b><span style='font-weight:bold'>To:</span></b> linuxppc-embedded@ozlabs.org<br>
<b><span style='font-weight:bold'>Subject:</span></b> Xilininx GPIO</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Hello
there,</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>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.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> </span></font>
<br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>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.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
have seen other peoples consoles stating that the gpio is mapped to xx but this
doesn't happen for me.</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>I
am using the default bit file for the ml507 board, and have created device
files </span></font><br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>/dev/xgpio0
</span></font><br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>/dev/xgpio1
etc with major 10 and minor 185 </span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>However
if I try to open these devices the open fails. </span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>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.</span></font><o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Many
thanks</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Peter
Scott</span></font> <o:p></o:p></p>
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