[PATCH v3 0/2] drm/imx/lcdc: Implement DRM driver for imx21

[Uwe Kleine-König]

On Fri, Dec 16, 2022 at 05:57:58PM -0600, Rob Herring wrote:
> On Fri, Dec 16, 2022 at 06:50:04PM +0100, Uwe Kleine-König wrote:
> > Hello,
> > 
> > Changes since v2:
> > 
> >  - added allOf as Krzysztof requested
> >  - reworked driver based on Philipp's comments
> >    (improved error handling, different selects, moved driver to a subdirectory,
> >    header sorting, drm_err instead of DRM_ERROR, inlined
> >    imx_lcdc_check_mode_change, make use of dev_err_probe())
> >  
> > Krzysztof also pointed out that we're now having two compatibles for a
> > single hardware. Admittedly this is unusual, but this is the chance that
> > the (bad) compatible identifier imx21-fb gets deprecated. The hardware
> > is called LCDC and only the linux (framebuffer) driver is called imxfb.
> 
> The problem is you can't have firmware (with the DTB) that supports 
> both. Well, you can if you want to have some firmware setting that 
> selects which one. Otherwise, it's really an OS problem to decide what 
> to use. 

I don't understand what you intend to say here. The same applies if the
compatible is the same for both binding alternatives, isn't it? Do you
consider a firmware problem better or an OS problem?

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | https://www.pengutronix.de/ |
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