linux-kernel - Re: [PATCH v3 2/3] sparc: time: Replace update_persistent_clock() with CONFIG_RTC

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Date:	Fri, 12 Jun 2015 10:42:38 +0200
From:	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
To:	Xunlei Pang <xlpang@....com>,
	"David S. Miller" <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, rtc-linux@...glegroups.com,
	Alessandro Zummo <a.zummo@...ertech.it>,
	John Stultz <john.stultz@...aro.org>,
	Arnd Bergmann <arnd@...db.de>, sparclinux@...r.kernel.org,
	Xunlei Pang <pang.xunlei@...aro.org>
Subject: Re: [PATCH v3 2/3] sparc: time: Replace update_persistent_clock()
 with CONFIG_RTC_SYSTOHC

Dave,

I would like to take that patch as part of the series once you have
acked it.

On 12/06/2015 at 11:10:17 +0800, Xunlei Pang wrote :
> From: Xunlei Pang <pang.xunlei@...aro.org>
> 
> On Sparc systems, update_persistent_clock() uses RTC drivers to do
> the job, it makes more sense to hand it over to CONFIG_RTC_SYSTOHC.
> 
> In the long run, all the update_persistent_clock() should migrate to
> proper class RTC drivers if any and use CONFIG_RTC_SYSTOHC instead.
> 
> Signed-off-by: Xunlei Pang <pang.xunlei@...aro.org>
> ---
>  arch/sparc/Kconfig          |  2 +-
>  arch/sparc/kernel/time_32.c | 21 ---------------------
>  arch/sparc/kernel/time_64.c | 14 --------------
>  3 files changed, 1 insertion(+), 36 deletions(-)
> 
> diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig
> index e49502a..56442d2 100644
> --- a/arch/sparc/Kconfig
> +++ b/arch/sparc/Kconfig
> @@ -25,6 +25,7 @@ config SPARC
>  	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
>  	select RTC_CLASS
>  	select RTC_DRV_M48T59
> +	select RTC_SYSTOHC
>  	select HAVE_DMA_ATTRS
>  	select HAVE_DMA_API_DEBUG
>  	select HAVE_ARCH_JUMP_LABEL if SPARC64
> @@ -35,7 +36,6 @@ config SPARC
>  	select HAVE_BPF_JIT
>  	select HAVE_DEBUG_BUGVERBOSE
>  	select GENERIC_SMP_IDLE_THREAD
> -	select GENERIC_CMOS_UPDATE
>  	select GENERIC_CLOCKEVENTS
>  	select GENERIC_STRNCPY_FROM_USER
>  	select GENERIC_STRNLEN_USER
> diff --git a/arch/sparc/kernel/time_32.c b/arch/sparc/kernel/time_32.c
> index 8caf45e..c9692f3 100644
> --- a/arch/sparc/kernel/time_32.c
> +++ b/arch/sparc/kernel/time_32.c
> @@ -23,7 +23,6 @@
>  #include <linux/mm.h>
>  #include <linux/interrupt.h>
>  #include <linux/time.h>
> -#include <linux/rtc.h>
>  #include <linux/rtc/m48t59.h>
>  #include <linux/timex.h>
>  #include <linux/clocksource.h>
> @@ -65,8 +64,6 @@ DEFINE_PER_CPU(struct clock_event_device, sparc32_clockevent);
>  DEFINE_SPINLOCK(rtc_lock);
>  EXPORT_SYMBOL(rtc_lock);
>  
> -static int set_rtc_mmss(unsigned long);
> -
>  unsigned long profile_pc(struct pt_regs *regs)
>  {
>  	extern char __copy_user_begin[], __copy_user_end[];
> @@ -87,11 +84,6 @@ EXPORT_SYMBOL(profile_pc);
>  
>  volatile u32 __iomem *master_l10_counter;
>  
> -int update_persistent_clock(struct timespec now)
> -{
> -	return set_rtc_mmss(now.tv_sec);
> -}
> -
>  irqreturn_t notrace timer_interrupt(int dummy, void *dev_id)
>  {
>  	if (timer_cs_enabled) {
> @@ -362,16 +354,3 @@ void __init time_init(void)
>  		sbus_time_init();
>  }
>  
> -
> -static int set_rtc_mmss(unsigned long secs)
> -{
> -	struct rtc_device *rtc = rtc_class_open("rtc0");
> -	int err = -1;
> -
> -	if (rtc) {
> -		err = rtc_set_mmss(rtc, secs);
> -		rtc_class_close(rtc);
> -	}
> -
> -	return err;
> -}
> diff --git a/arch/sparc/kernel/time_64.c b/arch/sparc/kernel/time_64.c
> index edbbeb1..2e6035c 100644
> --- a/arch/sparc/kernel/time_64.c
> +++ b/arch/sparc/kernel/time_64.c
> @@ -28,7 +28,6 @@
>  #include <linux/cpufreq.h>
>  #include <linux/percpu.h>
>  #include <linux/miscdevice.h>
> -#include <linux/rtc.h>
>  #include <linux/rtc/m48t59.h>
>  #include <linux/kernel_stat.h>
>  #include <linux/clockchips.h>
> @@ -394,19 +393,6 @@ static struct sparc64_tick_ops hbtick_operations __read_mostly = {
>  
>  static unsigned long timer_ticks_per_nsec_quotient __read_mostly;
>  
> -int update_persistent_clock(struct timespec now)
> -{
> -	struct rtc_device *rtc = rtc_class_open("rtc0");
> -	int err = -1;
> -
> -	if (rtc) {
> -		err = rtc_set_mmss(rtc, now.tv_sec);
> -		rtc_class_close(rtc);
> -	}
> -
> -	return err;
> -}
> -
>  unsigned long cmos_regs;
>  EXPORT_SYMBOL(cmos_regs);
>  
> -- 
> 1.9.1
> 
> 

-- 
Alexandre Belloni, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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