From mboxrd@z Thu Jan 1 00:00:00 1970 From: chris@chrishell.de (chrishell) Date: Fri, 11 Oct 2013 16:49:58 +0200 Subject: Subject: Problems with of_find_compatible_node In-Reply-To: References: Message-ID: <52581016.1080007@chrishell.de> To: kernelnewbies@lists.kernelnewbies.org List-Id: kernelnewbies.lists.kernelnewbies.org 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 at kernelnewbies.org > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 455 bytes Desc: OpenPGP digital signature Url : http://lists.kernelnewbies.org/pipermail/kernelnewbies/attachments/20131011/66ccb260/attachment.bin