Using uio_dmem_genirq with device tree

Greg Anders greg at
Wed May 29 09:46:48 EDT 2019


Hello all,

I am trying to figure out how to use the uio_dmem_genirq driver with a platform device described in my device tree
My device tree entry looks something like this:

       mydevice: mydevice at a0001000 {
               compatible = "generic-uio";

And in my bootargs I have


This works when using uio_pdrv_genirq but not when using uio_dmem_genirq. By "works" I mean that with uio_pdrv_genirq I see my device mapped under /sys/class/uio, but there is no such mapping with uio_dmem_genirq.

Looking at the source for the drivers, I notice that the uio_pdrv_genirq driver has the following lines that are not included in uio_dmem_genirq:

       module_param_string(of_id, uio_of_genirq_match[0].compatible, 128, 0);
       MODULE_PARAM_DESC(of_id, "Openfirmware id of the device to be handled by uio");

Do these lines need to be included for the uio_dmem_genirq driver to work?

I have read through the Userspace IO HOWTO but that guide doesn't cover using the generic UIO drivers with the device tree (as far as I can tell, I am a kernel newbie after all).

Thank you for your help,

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <>

More information about the Kernelnewbies mailing list