Re: [PATCH 1/4] dt-bindings: display: tegra: Make non-vm registers optional

[Mikko Perttunen <mperttunen@nvidia.com>]

On Thursday, June 25, 2026 5:34 PM Krzysztof Kozlowski wrote:
> On Mon, Jun 22, 2026 at 05:22:50PM +0900, Mikko Perttunen wrote:
> > Host1x can be used without accessing the hypervisor or common
> > registers. Adjust the bindings to make them optional.
> 
> You still have these registers in the hardware, so it is not optional,
> not flexible. IOW, DTS represents the view of real hardware for the
> software, and that hardware still has this address space regardless if
> OS should use it or not.
> 
> Otherwise you need to provide better background here.
> 
> Best regards,
> Krzysztof
> 
> 

The intent is that the vm-only version is used in situations where the
other register regions are not available to software. Typically that
means running as a virtual machine, and the hypervisor owns the non-vm
register regions and doesn't pass them to the guest.

Since the guest runs under the hypervisor, its view of 'real hardware'
is what the hypervisor is exposing to it -- in this case with just the
"vm" register region.

I'll add further explanation along above lines to the commit message
if you're OK with it.

Thank you
Mikko