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Date: Thu, 19 Dec 2013 06:30:10 +0100 From: Arnd Bergmann <arnd@...db.de> To: Sergei Ianovich <ynvich@...il.com> Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Daniel Mack <zonque@...il.com>, Haojian Zhuang <haojian.zhuang@...il.com> Subject: Re: [PATCH v2 00/16] ARM: support for ICP DAS LP-8x4x (with dts) On Wednesday 18 December 2013, Sergei Ianovich wrote: > > You would still be able to boot a kernel with an old dts file on a new > > kernel if it just contains a "simple-bus" node here, as long as it doesn't > > need any boot-time setup at the bus controller. We can change the dts > > file later if we need to add this functionality, which would break booting > > old kernels with the new dts files, which isn't much of a problem in > > general. > > It should actually only break old kernels which require new > functionally. Otherwise, dts can have > > compatible = "marvell,pxa-extbus", "simple-bus"; > > and an older kernel will be happy with "simple-bus". Please correct me > if I'm wrong. This would work only if we can probe the devices behind the external bus controller before the controller itsef has been set up, since the initialization order can depend on a number of things but not the bus hierarchy. It will also work if the code setting up the bus controller can be guaranteed to run before we call of_platform_populate for the regular devices, which is probably the best solution here. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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