Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [PATCH 2/2] arm64: to allow EFI_RTC can be selected on ARM64 | Date | Mon, 28 Sep 2015 10:42:42 +0200 |
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On Monday 28 September 2015 16:29:57 Leizhen wrote: > > On 2015/9/28 15:35, Arnd Bergmann wrote: > > On Monday 28 September 2015 13:34:38 Zhen Lei wrote: > >> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > >> index 07d1811..25cec57 100644 > >> --- a/arch/arm64/Kconfig > >> +++ b/arch/arm64/Kconfig > >> @@ -85,7 +85,7 @@ config ARM64 > >> select PERF_USE_VMALLOC > >> select POWER_RESET > >> select POWER_SUPPLY > >> - select RTC_LIB > >> + select RTC_LIB if !EFI > >> select SPARSE_IRQ > >> select SYSCTL_EXCEPTION_TRACE > >> select HAVE_CONTEXT_TRACKING > > > > Sorry, we can't do that: enabling EFI has to be done in a way that it only > > adds features but not disables them. > > I run "make ARCH=arm64 menuconfig" and found that RTC_CLASS is selected by default. Actually, RTC_LIB only > controls whether to display some configs when run "make menuconfig". I list all informations below: > > ---------make ARCH=arm64 menuconfig----- > [*] Real Time Clock ---> > > ---------drivers/rtc/Kconfig------- > menuconfig RTC_CLASS > bool "Real Time Clock" > default n > depends on !S390 && !UML > select RTC_LIB
Ok, I see. So your patch here has no effect at all and can be dropped, or we can remove the 'select RTC_LIB' without the EFI dependency.
> ----------------------------------- > find . -name "*Kconfig*" | xargs grep RTC_LIB > ./drivers/rtc/Kconfig:config RTC_LIB > ./drivers/rtc/Kconfig: select RTC_LIB > ./drivers/char/Kconfig:if RTC_LIB=n > ./drivers/char/Kconfig:endif # RTC_LIB > ./arch/x86/Kconfig: select RTC_LIB > ./arch/arm/Kconfig: select RTC_LIB > ./arch/arm64/Kconfig: select RTC_LIB if !EFI > ./arch/sh/Kconfig: select RTC_LIB > ./arch/mips/Kconfig: select RTC_LIB if !MACH_LOONGSON64 > > --------------drivers/char/Kconfig-------------- > if RTC_LIB=n > > config RTC > tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)" > > ....... > > endif # RTC_LIB > > > > > > Your patch breaks RTC on all non-EFI platforms as soon as CONFIG_EFI > > is selected by the user. > > No, on non-EFI platforms, they can still use RTC as before. As I mentioned above, > RTC_LIB only controls whether to display some configs when run "make menuconfig". > On ARM64, (in this patch) I only allowed EFI_RTC can be showed when RTC_LIB was > not selected. >
but that is the wrong driver that uses the legacy API, we cannot have that on ARM because it conflicts with the normal RTC_CLASS drivers.
> --------------drivers/char/Kconfig-------------- > if RTC_LIB=n > > config RTC > tristate "Enhanced Real Time Clock Support (legacy PC RTC driver)" > > ....... > > config EFI_RTC > bool "EFI Real Time Clock Services" > depends on IA64 || ARM64 > > ....... > > endif # RTC_LIB
The driver you want is RTC_DRV_EFI, not EFI_RTC.
Arnd
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