Re: [PATCH v4 13/14] gunyah: rsc_mgr: Add auxiliary devices for console

From: Elliot Berman
Date: Wed Oct 05 2022 - 17:48:33 EST

On 10/4/2022 11:21 PM, Greg Kroah-Hartman wrote:
On Tue, Oct 04, 2022 at 04:49:27PM -0700, Elliot Berman wrote:
On 9/30/2022 5:19 AM, Greg Kroah-Hartman wrote:
On Wed, Sep 28, 2022 at 12:56:32PM -0700, Elliot Berman wrote:
Gunyah resource manager exposes a concrete functionalities which
complicate a single resource manager driver.

I am sorry, but I do not understand this sentance. What is so
complicated about individual devices being created? Where are they
created? What bus?

There's no complexity here with using individual devices, that's why I
wanted to create secondary (auxiliary devices).

IOW -- "I have a platform device that does a lot of different things. Split
up the different functionalities of that device into sub devices using the
auxiliary bus."

Why not just have multiple platform devices? You control them, don't
make it more complex than it should be.

And why are these platform devices at all?

As you say:

A key requirement for utilizing the auxiliary bus is that there is no
dependency on a physical bus, device, register accesses or regmap support.
These individual devices split from the core cannot live on the platform bus
as they are not physical devices that are controlled by DT/ACPI.

These are not in the DT. So just make your own bus for them instead of
using a platform device. Don't abuse a platform device please.

I'll avoid creating platform devices. Are there any concerns with creating auxiliary device under the platform device? There will only be 2 auxiliary devices under this Resource Manager device: one for console, and one for a VM loader.


greg k-h