Hi Pantelis, Grant, On Fri, Mar 20, 2015 at 12:39 PM, Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> wrote: >> On Mar 19, 2015, at 21:18 , Grant Likely <grant.likely@xxxxxxxxxxxx> wrote: >> >> On Tue, 16 Dec 2014 14:11:31 +0200 >> , Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx> >> wrote: >>> A nice side-effect of the changes in DTC for supporting overlays >>> is that it is now possible to do dependency tracking of platform >>> devices automatically. >>> >>> This patch implements dependency aware probe order for users >>> of of_platform_populate. >>> >>> There are no changes in the syntax of the DTS bindings, the >>> dependency is generated automatically by the use of phandle >>> references. >> >> Do you have measurements showing improvement? Conceptually, I don't have >> a problem with having a small scale solution like this, but I want proof >> that it actively makes things better, and is worth the extra complexity. >> It's not an easy block of code to understand. >> > > I will be the first to admit that the code it’s a bit hard to follow, but > that’s the nature of trees and recursion. > > FWIW I’ve been booting with this applied for a month with no adverse effects, > besides the fact that there dependency cycles which I would file as a bug. IIUC, this would fix the issue I worked around in "ARM: shmobile: r8a73a4: Move pfc node to work around probe ordering bug"? https://git.kernel.org/cgit/linux/kernel/git/horms/renesas.git/commit/?h=r8a73a4-ccf-and-multiplatform-for-v4.1&id=e4ba0a9bddff3ba52cec100414d2f178440efc91 I'll give it a try when I'm back from ELC... Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds -- 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
