On Mon, Aug 17, 2015 at 10:48:20AM -0400, Rob Clark wrote: > On Mon, Aug 17, 2015 at 7:38 AM, Thierry Reding > <thierry.reding@xxxxxxxxx> wrote: > > On Mon, Aug 10, 2015 at 12:54:20PM -0700, Bjorn Andersson wrote: > >> On Fri 07 Aug 09:11 PDT 2015, Rob Clark wrote: > >> > >> > On Fri, Aug 7, 2015 at 9:19 AM, Thierry Reding <thierry.reding@xxxxxxxxx> wrote: > >> > > On Tue, Jul 21, 2015 at 03:36:02PM -0400, Rob Clark wrote: > >> [..] > >> > >> +- compatible: should be "auo,novatek-1080p-vid" > >> > > > >> > > This looks a little generic for a compatible string. Can't we get at the > >> > > specific panel model number that's been used? What if AUO ever produced > >> > > some other Novatek panel with a 1080p resolution? > >> > > >> > Maybe Sony or someone else can chime in? That somewhat generic name > >> > was all I could get from downstream android kernel. I'm sure there is > >> > a better possible name, although I have no means to find that out > >> > myself. > >> > > >> > >> We're working on it. > >> > >> > > Also, what's the -vid suffix for? > >> > > >> > the same panel seems to also work in cmd mode.. so idea was to have > >> > -vid and -cmd compat strings to choose which mode to operate in. > >> > > >> > >> An alternative would be to make it a bool property, to indicate video > >> mode - following how the framework is implemented. > > > > Please, let's not do either. This doesn't belong in the compatible > > string. The compatible string specifies the panel, and the panel > > supports both video and command modes. That's implied by the compatible > > string. > > > > Which mode to use is a configuration or policy decision and therefore > > doesn't belong in device tree. It should be up to the display driver to > > determine what the preferred mode of operation is. > > I would call it a "system integrator decision".. and at least > currently we don't have anywhere better than DT for that. Maybe it's > one of those "if all you have is a hammer, everything looks like a > nail" things.. If it were a system integrator decision then I'd agree it should be parameterizable in DT. But to my knowledge you can run any command mode capable display in video mode just fine. Thierry
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