Re: [PATCH v1 07/14] dt-bindings: lcdif: Do not require power-domains for i.MX6ULL

[Sebastian Reichel]

Hi Stefan,

On Mon, Feb 12, 2024 at 08:20:35PM +0100, Stefan Wahren wrote:
> Am 10.02.24 um 02:18 schrieb Sebastian Reichel:
> > i.MX6UL(L) uses "fsl,imx6sx-lcdif" as fallback compatible string,
> > but has only very lightweight DISPLAY power domain. Its DISPLAY
> > power domain is not supported by the binding / Linux kernel at
> > the moment. Since the current setup is working, let's remove the
> > power-domain from being required for that platform to fix the warning
> > printed by CHECK_DTBS=y.
> i'm not sure this is a good idea. In case i.MX6UL(L) is different from
> i.MX6SX here, then it should have a different compatible.

It already has. The i.MX6UL(L) compatible looks like this:

compatible = "fsl,imx6ul-lcdif", "fsl,imx6sx-lcdif"

So the i.MX6SX one is just a fallback compatible. But the current
requirement for power-domains affects i.MX6UL(L), since it says
the compatible only needs to contain "fsl,imx6sx-lcdif" somewhere
to make power-domains mandatory.

Note, that the kernel driver does not use "fsl,imx6ul-lcdif", so
the hardware itself is indeed compatible.

-- Sebastian