On Sun, Jul 28, 2013 at 11:35 AM, Richard Cochran <[email protected]> wrote: > On Sun, Jul 28, 2013 at 10:09:57AM -0400, [email protected] wrote: >> >> 3.z kernel is free to alter the schema. But it will have to supply the >> necessary quirks needed to keep those old dtb's functioning. > > The quirks idea sounds okay to me, if it can really provide forward > compatibility. In practice, I doubt anyone will really spend the > effort to make this work. I think it would be much easier to make sure > the bindings are "future proof" in the first place.
"furture proof" is much easier to say that it is to do. We've been messing around with the audio bindings for three years and still don't have a really good scheme. It is pretty easy to come up with the first 90% of a device tree. It is really hard to work out that last 10%. You can easily get the chips into the tree. Doing that will load the correct device drivers. But now how are these chips wired together? Is the appropriate button, LED, etc attached to all the IO pins offered by the chip? Those answers vary by the PCB the chip was used in.. Trying to figure out a scheme for this has lead to some volatility in the device trees. The whole concept of pin mapping was missing from the early device trees. > > Thanks, > Richard -- Jon Smirl [email protected] -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
