Re: [PATCH v2 2/5] arm64: dts: imx8qxp: Add display controller subsystem

[Frank Li]

On Fri, Oct 16, 2026 at 06:16:38PM +0800, Liu Ying wrote:
> On Thu, Oct 15, 2026 at 11:22:33AM -0500, Frank Li wrote:
> > On Thu, Oct 15, 2026 at 11:41:54AM +0800, Liu Ying wrote:
> > > Hi Alexander,
> > >
> > > On Wed, Oct 14, 2026 at 09:16:46AM +0200, Alexander Stein wrote:
> > >
> > > [...]
> > >
> > ...
> > > > +
> > > > +			dc0_framegen1: framegen@5618d400 {
> > > > +				reg = <0x5618d400 0x98>;
> > > > +				clocks = <&dc0_disp_lpcg IMX_LPCG_CLK_1>;
> > > > +				interrupt-parent = <&dc0_intc>;
> > > > +				interrupts = <28>, <29>, <30>, <31>,
> > > > +					     <45>, <46>, <47>, <48>;
> > > > +				interrupt-names = "int0", "int1", "int2", "int3",
> > > > +						  "primsync_on", "primsync_off",
> > > > +						  "secsync_on", "secsync_off";
> > > > +			};
> > > > +
> > > > +			dc0_tcon1: tcon@5618e400 {
> > > > +				reg = <0x5618e400 0x588>;
> > > > +
> > > > +				port {
> > > > +					dc0_disp1_dc0_pixel_combiner_ch1: endpoint {
> > > > +						remote-endpoint = <&dc0_pixel_combiner_ch1_dc0_disp1>;
> > > > +					};
> > > > +				};
> > > > +			};
> > > > +		};
> > > > +	};
> > >
> > > I'm thinking that it would be good to have a complete display controller
> > > DT node in the first place, including those prefetch engines attached to
> > > fetchunits through the fsl,prg property.
> >
> > what's current prefetch engines status?
>
> I need to address quite a few comments on v6.
> Some are difficult.

If needn't big change when add prefetch engines, should it be fine add this
part firstly? It'd better than nothings.

Frank

>
> > Is it possible merge at v7.5 ?
>
> Not sure.
>
> >
> > Frank
> >
> > >  In this way, display controller
> > > driver's life would be easier - all child/grandchild devices are always
> > > available.  I'm considering to adding a check to the Linux display controller
> > > driver to ensure the availability(at least for critical child/grandchild
> > > devices).
> > >
> > > --
> > > Regards,
> > > Liu Ying
> > >
>
> --
> Regards,
> Liu Ying