On Fri, Aug 07, 2015 at 10:17:36AM -0400, Alex Deucher wrote: > On Fri, Aug 7, 2015 at 6:25 AM, Mark Brown <broonie@xxxxxxxxxx> wrote: > > Looking at the code I'm not seeing too much bus specific except for the > > above which looks like the sort of device we usually represent as a MFD > > (with the MFD providing resource distribution and arbitration between > > various component devices which fit into the subsystem). Why code a new > > bus for this device? > Adding Felix who did worked on the design for this. The idea is that > there are hw blocks on the GPU that are controlled by drivers that are > part of other subsystems. Those drivers need access to resources > (e.g., the MMIO aperture) controlled by the GPU driver. I guess this > is a MFD of sorts. If this is not the preferred way to handle this > type of device, what is? Can you point me to another driver that > handles this differently? Yeah, this sounds like a MFD - see drivers/mfd and take a look at how the drivers there deal with this.
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