Re: [PATCH 1/2] arm64: dts: qcom: hamoa-iot-evk: Add eDP display overlay

[Dmitry Baryshkov]

On Fri, Aug 07, 2026 at 03:30:13PM +0530, Anand Tiwari wrote:
> On Thu, Aug 06, 2026 at 07:05:37PM -0500, Bjorn Andersson wrote:
> > On Thu, Aug 06, 2026 at 10:01:20PM +0530, Anand Tiwari wrote:
> > > Move the eDP panel configuration and related power, backlight, and pinctrl
> > > nodes into a separate overlay. Keep the base DTB suitable for headless
> > > variants and provide a composite DTB for headed variants.
> > 
> > To quote:
> > https://docs.kernel.org/process/submitting-patches.html#describe-your-changes
> > 
> > """
> > Describe your problem. Whether your patch is a one-line bug fix or 5000
> > lines of a new feature, there must be an underlying problem that
> > motivated you to do this work. Convince the reviewer that there is a
> > problem worth fixing and that it makes sense for them to read past the
> > first paragraph.
> > """
> > 
> > In fact, I'm not even able to guess what the problem you're fixing here.
> > 
> > Regards,
> > Bjorn
> >
> 
> The problem is that the base device trees currently describe the eDP
> display hardware unconditionally. However, Hamoa and Purwa IoT EVKs
> are also available in headless variants without an eDP panel.
> 
> With current base DTBs, headless variants are not stable where eDP panel is not
> physically connected with board and userspace is trying to use it.

Please define "are not stable"

> This series fixes the inaccurate hardware description by keeping the
> base DTBs limited to hardware common to both variants and moving the
> eDP-specific nodes into separate overlays. The base DTB can therefore
> be used for headless variants, while the overlay is selected for
> headed variants.

-- 
With best wishes
Dmitry