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

[Krzysztof Kozlowski]

On Thu, Jun 25, 2026 at 06:17:39PM +0900, Mikko Perttunen wrote:
> 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.

Yeah, it's fine. Please extend the commit msg to make it more obvious.

Best regards,
Krzysztof