Kevin,

On Thu, Aug 27, 2015 at 5:24 PM, Kevin Hilman [off-list ref] wrote:

quoted

That is not really workable: the attach and detach happen in
probe/remove path; if you do not have driver for the device you will
miss the clocks for it.

And in my proposal, I suggested that clocks without drivers are
good candidates to list in the domain, with the caveat that the be
called out (documented) as being device clocks that are missing a
driver, so when a driver shows up they can be moved accordingly, and in
a way that actually describes the hardware.

What happens if someone disables the driver using the CONFIG subsystem?

What happens if this is a device that someone has set to 'status =
"disabled";' in the device tree?

Even if the device is disabled in one of those two ways, we still need
the clocks to be turned on.  ...so if we turn on/off the VIO domain we
need to turn on the EDP clock even if there's no EDP in the current
board / config.  We might turn on/off VIO for one of the other devices
in the VIO domain for one of the other devices in VIO that we are
using.

-Doug