linux-kernel - Re: [PATCH] rtc: ia64: allow other architectures to use EFI RTC

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Date:	Mon, 23 Jun 2014 17:27:50 -0400
From:	Mark Salter <msalter@...hat.com>
To:	Alessandro Zummo <a.zummo@...ertech.it>
Cc:	Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>,
	linux-ia64@...r.kernel.org, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rtc: ia64: allow other architectures to use EFI RTC

Ping.

On Fri, 2014-06-13 at 14:50 -0400, Mark Salter wrote:
> Currently, the rtc-efi driver is restricted to ia64 only.
> Newer architectures with EFI support may want to also use
> that driver. This patch moves the platform device setup
> from ia64 into drivers/rtc and allow any architecture with
> CONFIG_EFI=y to use the rtc-efi driver.
> 
> Signed-off-by: Mark Salter <msalter@...hat.com>
> ---
>  arch/ia64/kernel/time.c        | 15 ---------------
>  drivers/rtc/Kconfig            |  2 +-
>  drivers/rtc/Makefile           |  4 ++++
>  drivers/rtc/rtc-efi-platform.c | 30 ++++++++++++++++++++++++++++++
>  4 files changed, 35 insertions(+), 16 deletions(-)
>  create mode 100644 drivers/rtc/rtc-efi-platform.c
> 
> diff --git a/arch/ia64/kernel/time.c b/arch/ia64/kernel/time.c
> index 71c52bc..a149c67 100644
> --- a/arch/ia64/kernel/time.c
> +++ b/arch/ia64/kernel/time.c
> @@ -384,21 +384,6 @@ static struct irqaction timer_irqaction = {
>  	.name =		"timer"
>  };
>  
> -static struct platform_device rtc_efi_dev = {
> -	.name = "rtc-efi",
> -	.id = -1,
> -};
> -
> -static int __init rtc_init(void)
> -{
> -	if (platform_device_register(&rtc_efi_dev) < 0)
> -		printk(KERN_ERR "unable to register rtc device...\n");
> -
> -	/* not necessarily an error */
> -	return 0;
> -}
> -module_init(rtc_init);
> -
>  void read_persistent_clock(struct timespec *ts)
>  {
>  	efi_gettimeofday(ts);
> diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
> index 0754f5c..4478a59 100644
> --- a/drivers/rtc/Kconfig
> +++ b/drivers/rtc/Kconfig
> @@ -789,7 +789,7 @@ config RTC_DRV_DA9063
>  
>  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.
> diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
> index 70347d0..f1dfc36 100644
> --- a/drivers/rtc/Makefile
> +++ b/drivers/rtc/Makefile
> @@ -10,6 +10,10 @@ obj-$(CONFIG_RTC_SYSTOHC)	+= systohc.o
>  obj-$(CONFIG_RTC_CLASS)		+= rtc-core.o
>  rtc-core-y			:= class.o interface.o
>  
> +ifdef CONFIG_RTC_DRV_EFI
> +rtc-core-y			+= rtc-efi-platform.o
> +endif
> +
>  rtc-core-$(CONFIG_RTC_INTF_DEV)	+= rtc-dev.o
>  rtc-core-$(CONFIG_RTC_INTF_PROC) += rtc-proc.o
>  rtc-core-$(CONFIG_RTC_INTF_SYSFS) += rtc-sysfs.o
> diff --git a/drivers/rtc/rtc-efi-platform.c b/drivers/rtc/rtc-efi-platform.c
> new file mode 100644
> index 0000000..1a7f890
> --- /dev/null
> +++ b/drivers/rtc/rtc-efi-platform.c
> @@ -0,0 +1,30 @@
> +/*
> + * Moved from arch/ia64/kernel/time.c
> + *
> + * Copyright (C) 1998-2003 Hewlett-Packard Co
> + *	Stephane Eranian <eranian@....hp.com>
> + *	David Mosberger <davidm@....hp.com>
> + * Copyright (C) 1999 Don Dugger <don.dugger@...el.com>
> + * Copyright (C) 1999-2000 VA Linux Systems
> + * Copyright (C) 1999-2000 Walt Drummond <drummond@...inux.com>
> + */
> +#include <linux/init.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/efi.h>
> +#include <linux/platform_device.h>
> +
> +static struct platform_device rtc_efi_dev = {
> +	.name = "rtc-efi",
> +	.id = -1,
> +};
> +
> +static int __init rtc_init(void)
> +{
> +	if (platform_device_register(&rtc_efi_dev) < 0)
> +		pr_err("unable to register rtc device...\n");
> +
> +	/* not necessarily an error */
> +	return 0;
> +}
> +module_init(rtc_init);


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