Messages in this thread | | | Date | Fri, 09 Jan 2015 14:38:39 +0100 | From | Daniel Lezcano <> | Subject | Re: [PATCH] clocksource: tegra: wrap arch/arm-specific sections in CONFIG_ARM |
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On 01/09/2015 02:33 PM, Thierry Reding wrote: > On Fri, Jan 09, 2015 at 02:24:24PM +0100, Daniel Lezcano wrote: >> On 01/09/2015 01:21 PM, Thierry Reding wrote: >>> On Fri, Jan 09, 2015 at 09:31:08AM +0100, Daniel Lezcano wrote: >>>> On 01/09/2015 03:09 AM, Paul Walmsley wrote: >>>>> Hello Daniel >>>>> >>>>> On Thu, 8 Jan 2015, Daniel Lezcano wrote: >>>>> >>>>>> On 12/09/2014 11:07 PM, Paul Walmsley wrote: >>>>>>> >>>>>>> Like several of the other files in drivers/clocksource, >>>>>>> tegra20_timer.c contains code that can only compile when CONFIG_ARM is >>>>>>> enabled. This causes obvious problems when trying to compile this >>>>>>> code for NVIDIA ARM64-based SoCs, such as Tegra132. The same timer IP >>>>>>> blocks exist, so it seems appropriate to provide support for them. >>>>>>> >>>>>>> So until we figure out a better way to partition this code, wrap the >>>>>>> delay_timer and persistent_clock support code with preprocessor tests >>>>>>> for CONFIG_ARM. >>>>>>> >>>>>>> (The delay_timer code should not be needed at all on >>>>>>> ARM64 due to the presence of the ARMv8 architected timer. The >>>>>>> persistent_clock support code could become important once power >>>>>>> management modes are implemented that turn off the CPU complex.) >>>>>> >>>>>> IIUC, the cpuidle driver is not yet ready, right ? >>>>>> >>>>>> If it is the case, this driver is not needed yet, no ? >>>>> >>>>> The point of the patch is to allow the hardware drivers selected by >>>>> CONFIG_ARCH_TEGRA to build for an arm64 kernel, just as they build for >>>>> 32-bit ARM. >>>>> >>>>> There's nothing CPUIdle-specific about the patch - that is, this timer can >>>>> be selected as a clockevent and clocksource provider without the use of >>>>> CPUIdle - although low-power PM idle is likely to be a primary use-case. >>>> >>>> What I meant is this timer is not needed for the moment. >>>> >>>>>> Perhaps you can rework a bit this driver in the meantime to have a better fix >>>>>> than disabling the code with macros ? >>>>> >>>>> I'm happy to do that, but it would be nice to get the driver compiling >>>>> first for ARM64 :-) >>>>> >>>>>> Otherwise, please try at least to group the code into a minimal set of macros. >>>>> >>>>> So, would it be accurate to say that you would prefer a patch that changes >>>>> more lines of code, but minimizes preprocessor directives, to the current >>>>> patch? >>>> >>>> Yes at least an attempt to factor out a bit the driver. Those #ifdef are >>>> like #if 0, which is a quick fix. I am not strongly against this patch, but >>>> it would be nice to take the opportunity to reorganize it a bit. >>> >>> How about we do something like the attached patch instead for now. That >>> avoids any #ifdef'ery and still we don't attempt (and fail) to build the >>> driver on 64-bit ARM. >>> >>> With that applied we can incrementally make the changes to untangle the >>> ARM-specific parts and when the driver can build on 64-bit ARM we simply >>> select TEGRA_TIMER via Kconfig. >> >> Yes, that is exactly what I was thinking about after sending the previous >> email. And by this way, you also fixed the Kconfig option selection logic. > > Great. Will you give your Acked-by so that I can take that patch through > the Tegra tree to resolve the build dependency?
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
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