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 > > > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >
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