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    Subject[RFC PATCH 06/14] rtc-efi: register rtc-efi device when EFI enabled
    Date
    UEFI time services, GetTime(), SetTime(), GetWakeupTime(), SetWakeupTime() are also
    supported by other non-IA64 architecutre with UEFI BIOS, e.g. x86.

    This patch changed RTC_DRV_EFI configuration to depend on EFI but not just IA64. It
    checks efi_enabled flag and efi-rtc driver should enabled.

    Cc: Matt Fleming <matt.fleming@intel.com>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Matthew Garrett <matthew.garrett@nebula.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Jan Beulich <JBeulich@suse.com>
    Signed-off-by: Lee, Chun-Yi <jlee@suse.com>
    ---
    arch/x86/platform/efi/efi.c | 17 +++++++++++++++++
    drivers/rtc/Kconfig | 2 +-
    2 files changed, 18 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
    index 7a7a692..42d6052 100644
    --- a/arch/x86/platform/efi/efi.c
    +++ b/arch/x86/platform/efi/efi.c
    @@ -42,6 +42,7 @@
    #include <linux/io.h>
    #include <linux/reboot.h>
    #include <linux/bcd.h>
    +#include <linux/platform_device.h>

    #include <asm/setup.h>
    #include <asm/efi.h>
    @@ -876,6 +877,22 @@ void __init efi_enter_virtual_mode(void)
    0, NULL);
    }

    +static struct platform_device rtc_efi_dev = {
    + .name = "rtc-efi",
    + .id = -1,
    +};
    +
    +static int __init rtc_init(void)
    +{
    + if (efi_enabled(EFI_RUNTIME_SERVICES) &&
    + platform_device_register(&rtc_efi_dev) < 0)
    + pr_err("unable to register rtc-efi device...\n");
    +
    + /* not necessarily an error */
    + return 0;
    +}
    +arch_initcall(rtc_init);
    +
    /*
    * Convenience functions to obtain memory types and attributes
    */
    diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
    index 349dbc4..bee13de 100644
    --- a/drivers/rtc/Kconfig
    +++ b/drivers/rtc/Kconfig
    @@ -726,7 +726,7 @@ config RTC_DRV_DA9055

    config RTC_DRV_EFI
    tristate "EFI RTC"
    - depends on IA64
    + depends on EFI
    help
    If you say yes here you will get support for the EFI
    Real Time Clock.
    --
    1.6.4.2


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