Re: [PATCH 2/4] dt-bindings: display: tegra: Add channel/syncpoint range properties

[Mikko Perttunen <mperttunen@nvidia.com>]

On Thursday, June 25, 2026 5:36 PM Krzysztof Kozlowski wrote:
> On Mon, Jun 22, 2026 at 05:22:51PM +0900, Mikko Perttunen wrote:
> > Channels and syncpoints available may be limited when other system
> 
> What are channels and syncpoints?

Very host1x-specific hardware resources. Somewhat close to GPU channels
and semaphores / fences if you're familiar with those.

> 
> > components are using them. Add properties nvidia,channels and
> > nvidia,syncpoints to limit the range of usable channels and/or
> > syncpoints.
> 
> Why isn't this deducible from the compatible?

When Host1x is partitioned, the hypervisor (or other software entity
with access to the non-vm host1x register regions) can configure which
channels and syncpoints are available to each partition arbitrarily.

How that partitioning was done is not discoverable through hardware
directly, so we need to pass that information through device tree.

> 
> Also, nvidia,channels is too broad/generic. This is not ADC, right? And
> channels is a common term in IIO. And in few other cases.

It's not ADC. Yes, it's a common term in a lot of contexts. I can call
it nvidia,host1x-channels if you prefer but that seems a bit redundant
given the context.

> 
> Best regards,
> Krzysztof
> 
> 

Thank you
Mikko