linux-kernel - Re: [PATCH 2/2] arm64: to allow EFI

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Date:	Mon, 28 Sep 2015 16:41:19 +0800
From:	"Leizhen (ThunderTown)" <thunder.leizhen@...wei.com>
To:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
CC:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Xinwei Hu <huxinwei@...wei.com>, Zefan Li <lizefan@...wei.com>,
	Tianhong Ding <dingtianhong@...wei.com>,
	Hanjun Guo <guohanjun@...wei.com>
Subject: Re: [PATCH 2/2] arm64: to allow EFI_RTC can be selected on ARM64



On 2015/9/28 15:40, Ard Biesheuvel wrote:
> On 28 September 2015 at 06:34, Zhen Lei <thunder.leizhen@...wei.com> wrote:
>> Now, ARM64 is also support EFI startup. We hope use EFI runtime services
>> to get/set current time and date.
>>
>> RTC_LIB only controls some configs in drivers/char/Kconfig(included
>> EFI_RTC), and will be automatically selected when RTC_CLASS opened. So
>> this patch have no functional change but give an opportunity to select
>> EFI_RTC when RTC_CLASS closed.
>>
>> Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
>> ---
>>  arch/arm64/Kconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> 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
> 
> You can currently enable EFI_RTC just fine on arm64 when EFI is enabled.
> Why exactly do you need this patch on top?

Because when we run "make ARCH=arm64 menuconfig", RTC_LIB is always selected. And we have no opportunity
to deselect it. And EFI_RTC can be displayed only when RTC_LIB=n.

--------drivers/rtc/Kconfig-------
config RTC_LIB
        bool

menuconfig RTC_CLASS
        bool "Real Time Clock"
        default n
        depends on !S390 && !UML
        select RTC_LIB

--------------drivers/char/Kconfig--------------
if RTC_LIB=n

......

config EFI_RTC
        bool "EFI Real Time Clock Services"
        depends on IA64 || ARM64

.......

endif # RTC_LIB

> 
> .
> 

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