[PATCH 1/3] drm/mxsfb: Add an entry for "fsl,imx8mq-lcdif"

[Fabio Estevam]

Hi Lucas,

On Tue, Dec 12, 2023 at 3:19 PM Lucas Stach <l.stach at pengutronix.de> wrote:

> I don't really like this series. While we don't make any strong
> guarantees in this way, it breaks booting older kernels with a new DT.

I thought we needed only to guarantee that old DTs still run with
newer kernels, not the other way around.

> As this driver patch shows, there are no actual differences in the IP
> block between i.MX6SX and i.MX8MQ, it's just the SoC integration that's
> different, where in one SoC the controller is located in a power
> domain, while it isn't in another.
>
> To me this smells like making changes to parts that don't really care
> about those differences. The thing that cares about the difference is
> the DT schema validation and I feel like there must be a better way to
> describe this in the schema than to patch both driver and DT just to
> accommodate a SoC integration difference. Is there a way to make the
> power-domain property not dependent on the IP block, but the machine
> compatible?

Yes, this series is all about making dt-schema validation happy.

If there is a better alternative, I am all ears.

Rob, Krzysztof, Conor

Any suggestions?

Thanks