On Mon, Jul 7, 2008 at 1:49 AM, Andre Schwarz <[EMAIL PROTECTED]> wrote: > David, > > thanks - removed "device_type" from the DMA controller. > > Which nodes actually require "device_type" and which don't ? > > Is there some general rule ?
Segher, David; In OF, what is the purpose of device_type? From what I understand right now, each value of device_type claims a software interface that the device supports. So for example, device_type = "serial" means that firmware supports using the device as a serial port, correct? So, similarly, if OF did not have a driver for the device, then the presence a device_type property would be a bug, right? Does device_type indicated any other information other than firmware driver interface? I had an epiphany about device_type this weekend (and by epiphany, I mean realizing my own stupidity). If I'm correct about the above questions, then that would mean it is *always* a bug to have a device_type property in .dts file because there is no firmware interface. So, it seems to me that we shouldn't just be eliminating undefined device_type values, but also eliminate the ones that are defined in OF because .dts users do not support the firmware driver interface. Am I correct? The only situation where I can see it being appropriate to specify device_type is to work around older bindings that are ambiguous with their other properties. g. -- Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
