On 08/16/2012 02:43 PM, Alan Tull wrote: > > Hello, > > I'm Alan Tull, interested in dynamic features of device trees.
Hey Alan. How are you doing? > The following patch adds a char driver to add or remove device tree > nodes dynamically. Its ioctl passes a struct with: > - size of the blob > - pointer to the blob > > The path to add the nodes under is coded in the blob with dummy nodes. > For example the following can be compiled into a blob and sent to this > driver adding a single node under /soc/apb_periphs: > > /dts-v1/; > / { > soc { > apb_periphs { > i2c1: i2c@ffc05000 { > compatible = "snps,designware-i2c"; > reg = <0xffc05000 0x1000>; > interrupts = <0 159 4>; > emptyfifo_hold_master = <1>; > }; > }; > }; > }; > > I wanted to get feeback early before I went too far down this particular > path. As such, this code doesn't do any notification for drivers yet. > Also it won't properly add nested nodes yet. It can add/remove a single > node and see it show up properly under /proc/device-tree. Have you looked at arch/powerpc/platforms/pseries/reconfig.c? There was also a recent discussion titled "OF_DYNAMIC usage" that you should look at. I don't think a char driver and ioctls will fly... Another option could be kexecing with a new DTB if you can live with a reboot. Rob > > Alan Tull > Altera > > _______________________________________________ > devicetree-discuss mailing list > devicetree-discuss@lists.ozlabs.org > https://lists.ozlabs.org/listinfo/devicetree-discuss > _______________________________________________ devicetree-discuss mailing list devicetree-discuss@lists.ozlabs.org https://lists.ozlabs.org/listinfo/devicetree-discuss