Hi Mark,

Thanks for raising valid points/concerns.

On Mon, Feb 24, 2025 at 10:08:18AM +0000, Vincenzo Frascino wrote:

Hello Mark,

On 21/02/2025 18:54, Mark Rutland wrote:

quoted

Hi Vincenzo,

On Fri, Feb 21, 2025 at 06:03:39PM +0000, Vincenzo Frascino wrote:

quoted

The Morello architecture is an experimental extension to Armv8.2-A,
which extends the AArch64 state with the principles proposed in
version 7 of the Capability Hardware Enhanced RISC Instructions
(CHERI) ISA [1].

None of the CHERI stuff is supported upstream, so from upstream's PoV
this is a low-volume dev-board/SoC with an experimental ARMv8.2-A CPU.

I understand and agree with your concerns.

Agreed, I have no plans to upstream Morello support beyond the device tree.

quoted

quoted

This series adds dts support for the Arm Morello System Development
Platform.

Do we actually need the dts for this board?

I have one on my desk; it boots vanilla Debian 12 via UEFI + ACPI just
fine, with the Debian 6.1.0-13-arm64 kernel.

Is there something that we can only do with the DT? i.e. some
functionality that isn't exposed via ACPI?

How do you expect this DT to be used?

There are functionalities that are not exposed via ACPI, e.g. gpu, dpu, i2c for
the phy, etc. My aim to have upstream support for all the hardware exposed by
the platform.

Does this address some of your concerns ? I do understand some of these
are not well addressed in ACPI and hence people use DT as an alternative.

Note: This series contains only the basic infrastructure, the plan is add
progressively more features in the future.

I was thinking of queuing this in -next if all the bindings are acked.
Let me know if you still have concerns and would like to avoid getting
these merged. I will hold off then.

--
Regards,
Sudeep