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

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Date:	Mon, 28 Sep 2015 08:40:25 +0100
From:	Ard Biesheuvel <ard.biesheuvel@...aro.org>
To:	Zhen Lei <thunder.leizhen@...wei.com>
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 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?
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