Hello Vishwas,
thanks for your reply. But I don not have a /proc/device-tree at all. I
solved the problem by writing a appropriate node into the .dts-file and
recompile the whole kernel. I exchanged also "xilinx,cpld-led" with
"cpld-led". After that it worked.

Regards /Chris

Hi Chris,
              probably you can do cat /proc/device-tree o/p to see if such
a node exist in the device tree file.
also you can check
arch/ppc/boot/dts/  directory and check the .dts file to check if such an
entry really exist in the .dts file which
you are using.

Since in your case
 np = of_find_compatible_node(NULL,NULL,
"xilinx,cpld-led");
returns NULL, its a  sign that the entry does not exist in the .dts file
your system is using.
thnaks,
Vishwas S



Hello out there,
I got a problem with the kernel function "of_find_compatible_node". I
use it with:   np = of_find_compatible_node(NULL,NULL,
"xilinx,cpld-led"); or with   np = of_find_compatible_node(NULL,NULL,
"cpld-led"); but none of this works, because I get a null-pointer back.
But it suppose to work? The target is a PPC-walnut-board.
Which is the mechanism behind this function, which namespace is parsed
in order to detect devices on the board? Can I parse the whole namespace
in order to list up all devices?

What else can I do to solve this problem?

Thank you in advance...

Regards /chris



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