[Letux-kernel] [PATCH v9 1/8] drivers:input:tsc2007: add new common binding names, pre-calibration, flipping and rotation

Pavel Machek pavel at ucw.cz
Tue Feb 21 12:07:34 CET 2017


> > They are "pixels" or the touch controller, i.e. native unites in which
> > device reports coordinates, as opposed to points per inch, or
> > millimeters, or whatever. These "pixels" do not have to have 1:1
> > relation to the LCD pixels; in fact they rarely do.
> I wouldn't call this "pixels". Rather "ADC steps" or something.

Submit a patch.

> > Why? Nothing stops you from querying the device and figure out scaling.
> What stops me is that I have no (and do not want to have) that level of control over
> user-space code.

Umm. Then perhaps you should not be submitting kernel patches.

> > And still, according to DT folks, device tree forms an ABI and thus we
> > are not to change it, even if it is easy.
> I think this needs a more differentiated view.
> In my view the names of the binding properties and what they influence form indeed
> an ABI. It should be stable and interpreted in the same way.
> But it allows to load different firmware for different requirements. Like the user
> application ABI is stable but you can still load different software.

No. You can't expect people to konfigure kernel by modifying dts.

(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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