* Sebastian Reichel <sre@xxxxxxxx> [140516 10:42]: > On Fri, May 16, 2014 at 09:07:17AM -0700, Tony Lindgren wrote: > > * Tomi Valkeinen <tomi.valkeinen@xxxxxx> [140515 22:57]: > > > On 15/05/14 21:21, Tony Lindgren wrote: > > > >> But you're right, having "sharp,ls037v7dw01-omap-dss" in the .dts is an > > > >> alternative for the compatible-string conversion we do now. I guess it's > > > >> a matter of taste, but I rather hide it inside the kernel, in an > > > >> internal omapdss file, than pollute the .dts files with those compatible > > > >> strings. > > > > > > > > Well it avoid you parsing through all the nodes during booting > > > > and leaves out the function to do remapping. And removes the need > > > > for maintaining a custom display mapping table. I'd say that's a > > > > pretty good list of advantages right there :) > > > > > > Yep... I don't know. Maybe I'm being too careful about doing wrong > > > things with .dts. I just like it more if any hacks are in kernel code, > > > which I can remove without anyone noticing. > > > > > > Anyway, we already have board.dts files using the non-omapified > > > compatible strings in the mainline, so if I would now add the omapified > > > compatible strings to .dts files, those old board.dts files would break. > > > > > > So I guess the choice has already been made. > > > > I really think you should remove this misuse of device tree code ASAP. > > It's better to fix it up now than carry the hack for next two years > > and keep on adding to it. > > IMHO appending -omap-dss to a random device is an even bigger hack, > since its adding lots of bloat to the API. Let's assume there is > another OS using DT for ARM, but has no proper API for SPI > controllers and it introduces your hack to SPI devices. That would > mean each SPI device has -omap-spi appended (or -exynos-spi, > -foo-spi, ...). At least I would blame them for creating a huge > unmaintainable mess. I think you're misunderstanding. I do not want the naming to be Linux specific. The naming should naturally be as hardware specific as possible. In this case something like: compatible = "sharp,ls037v7dw01-dss", "sharp,ls037v7dw01"; Or we should probably use: compatible = "sharp,ls037v7dw01-dpi", "sharp,ls037v7dw01"; As dpi here reflects the hardware it's connected to. The dss is probably a Linux name. Not use what you're after with the SPI example though, but sounds like that's something different. > I think Tomi's workaround is a much better hack, since it keeps the > API clean. If the code simply prefixes "omapdss," to all > "child"-devices of omapdss it can be left mostly untouched, too. AFAIK that remapping not needed at all. All that is already available with the compatible flags. Regards, Tony -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
