Subject: [PATCH v2 02/13] ARM: convert arm/arm64 arch timer to use CLKSRC_OF init

From: [email-masked] (Rob Herring)
Date: Wed, 10 Apr 2013 18:17:31 -0500

On 04/04/2013 12:56 AM, Simon Horman wrote:
> On Mon, Apr 01, 2013 at 05:21:12PM -0500, Rob Herring wrote:
>> From: Rob Herring <[email-masked]>
>>
>> This converts arm and arm64 to use CLKSRC_OF DT based initialization for
>> the arch timer. A new function arch_timer_arch_init is added to allow for
>> arch specific setup.
>>
>> This has a side effect of enabling sched_clock on omap5 and exynos5. There
>> should not be any reason not to use the arch timers for sched_clock.
> 
> Would it be possible for you to either delay the removal of
> shmobile_timer_init. In general I am in favour of the following
> approach to wide changes such as this one:

I will simply change shmobile_timer_init to call clocksource_of_init
rather than deleting it. That should keep the new users working and then
it can be deleted latter.

> 1. Add new feature
> 2. Convert users to new feature
> 3. Remove old feature.
> 
> If it is not possible to delay the removal of shmobile_timer_init could you
> update your base such that you also remove its usage from the following
> files:
> 
> arch/arm/mach-shmobile/board-kzm9g-reference.c
> arch/arm/mach-shmobile/setup-r8a73a4.c
> arch/arm/mach-shmobile/setup-r8a7779.c
> arch/arm/mach-shmobile/board-lager.c
> arch/arm/mach-shmobile/board-ape6evm.c
> arch/arm/mach-shmobile/setup-r8a7778.c
> arch/arm/mach-shmobile/board-marzen-reference.c
> arch/arm/mach-shmobile/setup-r8a7790.c
> arch/arm/mach-shmobile/board-bockw.c

Why so many boards? There's been prior discussions about whether to add
DT into existing board files or start with a minimal DT board file and
add to it. The fact that there are 14 mach desc's using
shmobile_timer_init which is a function only used for DT and 17 DT mach
descs total for shmobile tells me perhaps the latter approach is needed.

Either way, it is good to see progress on DT support in shmobile.

Rob

> The above files are all present in the arm-soc/next/boards2 branch
> of the arm-soc tree which has pulled the renesas-boards3-for-v3.10 tag
> of git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git.
> I am happy for you use the later as a base if you wish.
> 
>> Signed-off-by: Rob Herring <[email-masked]>
>> Cc: Russell King <[email-masked]>
>> Cc: Kukjin Kim <[email-masked]>
>> Cc: Tony Lindgren <[email-masked]>
>> Cc: Simon Horman <[email-masked]>
>> Cc: Magnus Damm <[email-masked]>
>> Cc: Catalin Marinas <[email-masked]>
>> Cc: Will Deacon <[email-masked]>
>> Cc: John Stultz <[email-masked]>
>> Cc: Thomas Gleixner <[email-masked]>
>> Cc: linux-samsung-soc at vger.kernel.org
>> Cc: linux-omap at vger.kernel.org
>> Cc: linux-sh at vger.kernel.org
>> ---
>>  arch/arm/include/asm/arch_timer.h            |   13 +------------
>>  arch/arm/kernel/arch_timer.c                 |   17 +++--------------
>>  arch/arm/mach-exynos/mach-exynos5-dt.c       |    1 -
>>  arch/arm/mach-exynos/mct.c                   |    6 ------
>>  arch/arm/mach-highbank/highbank.c            |    5 +----
>>  arch/arm/mach-omap2/timer.c                  |    5 +----
>>  arch/arm/mach-shmobile/board-kzm9d.c         |    1 -
> 
> I have boot tested the board-kzm9d change on the kzm9d board, it seems fine.
> 
>>  arch/arm/mach-shmobile/include/mach/common.h |    1 -
>>  arch/arm/mach-shmobile/setup-emev2.c         |    1 -
> 
> I am not able to test the setup-emev2 portion properly at this time,
> booting the kzm9d board without the board-kzm9d file seems broken without
> your patch. However, your change seems reasonable to me.
> 
>>  arch/arm/mach-shmobile/setup-r8a7740.c       |    1 -
> 
> I am not able to test the setup-r8a7740 portion properly at this time,
> booting the armadillo800eva board without the board-armadillo800eva file
> seems broken without your patch. However, your change seems reasonable to
> me.
> 
>>  arch/arm/mach-shmobile/setup-sh7372.c        |    1 -
> 
> I am not able to test the setup-sh7372 portion properly at this time,
> booting the mackerel board without the board-mackerel file seems broken without
> your patch. However, your change seems reasonable to me.
> 
>>  arch/arm/mach-shmobile/setup-sh73a0.c        |    1 -
> 
> I have boot tested the setup-sh73a0 change on the kzm9g board, it seems fine.
> 
> 
> The tests above were made by merging
> 
> git://sources.calxeda.com/kernel/linux.git arm-timers
> head commit: df3f518db302caf9fc0511917c5e9021037f6fcd
> 	     ("devtree: add binding documentation for sp804")
> 
> and the renesas-next-20130403 tag of the renesas tree (URL above).
> 
>>  arch/arm/mach-shmobile/timer.c               |    6 ------
>>  arch/arm/mach-vexpress/v2m.c                 |    7 ++-----
>>  arch/arm/mach-virt/virt.c                    |    9 ---------
>>  arch/arm64/include/asm/arch_timer.h          |    5 +++++
>>  arch/arm64/kernel/time.c                     |    6 ++++--
>>  drivers/clocksource/Kconfig                  |    1 +
>>  drivers/clocksource/arm_arch_timer.c         |   23 +++++++++--------------
>>  include/clocksource/arm_arch_timer.h         |    6 ------
>>  20 files changed, 27 insertions(+), 89 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/arch_timer.h b/arch/arm/include/asm/arch_timer.h
>> index 7ade91d..7c1bfc0 100644
>> --- a/arch/arm/include/asm/arch_timer.h
>> +++ b/arch/arm/include/asm/arch_timer.h
>> @@ -10,8 +10,7 @@
>>  #include <clocksource/arm_arch_timer.h>
>>  
>>  #ifdef CONFIG_ARM_ARCH_TIMER
>> -int arch_timer_of_register(void);
>> -int arch_timer_sched_clock_init(void);
>> +int arch_timer_arch_init(void);
>>  
>>  /*
>>   * These register accessors are marked inline so the compiler can
>> @@ -110,16 +109,6 @@ static inline void __cpuinit arch_counter_set_user_access(void)
>>  
>>  	asm volatile("mcr p15, 0, %0, c14, c1, 0" : : "r" (cntkctl));
>>  }
>> -#else
>> -static inline int arch_timer_of_register(void)
>> -{
>> -	return -ENXIO;
>> -}
>> -
>> -static inline int arch_timer_sched_clock_init(void)
>> -{
>> -	return -ENXIO;
>> -}
>>  #endif
>>  
>>  #endif
>> diff --git a/arch/arm/kernel/arch_timer.c b/arch/arm/kernel/arch_timer.c
>> index a7536d4..dc74048 100644
>> --- a/arch/arm/kernel/arch_timer.c
>> +++ b/arch/arm/kernel/arch_timer.c
>> @@ -39,26 +39,15 @@ static void __init arch_timer_delay_timer_register(void)
>>  	register_current_timer_delay(&arch_delay_timer);
>>  }
>>  
>> -int __init arch_timer_of_register(void)
>> -{
>> -	int ret;
>> -
>> -	ret = arch_timer_init();
>> -	if (ret)
>> -		return ret;
>> -
>> -	arch_timer_delay_timer_register();
>> -
>> -	return 0;
>> -}
>> -
>> -int __init arch_timer_sched_clock_init(void)
>> +int __init arch_timer_arch_init(void)
>>  {
>>          u32 arch_timer_rate = arch_timer_get_rate();
>>  
>>  	if (arch_timer_rate == 0)
>>  		return -ENXIO;
>>  
>> +	arch_timer_delay_timer_register();
>> +
>>  	/* Cache the sched_clock multiplier to save a divide in the hot path. */
>>  	sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
>>  	sched_clock_func = arch_timer_sched_clock;
>> diff --git a/arch/arm/mach-exynos/mach-exynos5-dt.c b/arch/arm/mach-exynos/mach-exynos5-dt.c
>> index acaeb14..4d97b43 100644
>> --- a/arch/arm/mach-exynos/mach-exynos5-dt.c
>> +++ b/arch/arm/mach-exynos/mach-exynos5-dt.c
>> @@ -216,7 +216,6 @@ DT_MACHINE_START(EXYNOS5_DT, "SAMSUNG EXYNOS5 (Flattened Device Tree)")
>>  	.map_io		= exynos5_dt_map_io,
>>  	.init_machine	= exynos5_dt_machine_init,
>>  	.init_late	= exynos_init_late,
>> -	.init_time	= exynos4_timer_init,
>>  	.dt_compat	= exynos5_dt_compat,
>>  	.restart        = exynos5_restart,
>>  	.reserve	= exynos5_reserve,
>> diff --git a/arch/arm/mach-exynos/mct.c b/arch/arm/mach-exynos/mct.c
>> index c9d6650..04aff6a 100644
>> --- a/arch/arm/mach-exynos/mct.c
>> +++ b/arch/arm/mach-exynos/mct.c
>> @@ -21,7 +21,6 @@
>>  #include <linux/percpu.h>
>>  #include <linux/of.h>
>>  
>> -#include <asm/arch_timer.h>
>>  #include <asm/localtimer.h>
>>  
>>  #include <plat/cpu.h>
>> @@ -469,11 +468,6 @@ static void __init exynos4_timer_resources(void)
>>  
>>  void __init exynos4_timer_init(void)
>>  {
>> -	if (soc_is_exynos5440()) {
>> -		arch_timer_of_register();
>> -		return;
>> -	}
>> -
>>  	if ((soc_is_exynos4210()) || (soc_is_exynos5250()))
>>  		mct_int_type = MCT_INT_SPI;
>>  	else
>> diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c
>> index 76c1170..758150e 100644
>> --- a/arch/arm/mach-highbank/highbank.c
>> +++ b/arch/arm/mach-highbank/highbank.c
>> @@ -15,6 +15,7 @@
>>   */
>>  #include <linux/clk.h>
>>  #include <linux/clkdev.h>
>> +#include <linux/clocksource.h>
>>  #include <linux/dma-mapping.h>
>>  #include <linux/io.h>
>>  #include <linux/irq.h>
>> @@ -28,7 +29,6 @@
>>  #include <linux/amba/bus.h>
>>  #include <linux/clk-provider.h>
>>  
>> -#include <asm/arch_timer.h>
>>  #include <asm/cacheflush.h>
>>  #include <asm/cputype.h>
>>  #include <asm/smp_plat.h>
>> @@ -118,9 +118,6 @@ static void __init highbank_timer_init(void)
>>  	sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1");
>>  	sp804_clockevents_init(timer_base, irq, "timer0");
>>  
>> -	arch_timer_of_register();
>> -	arch_timer_sched_clock_init();
>> -
>>  	clocksource_of_init();
>>  }
>>  
>> diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c
>> index 4fd8025..7dd6453 100644
>> --- a/arch/arm/mach-omap2/timer.c
>> +++ b/arch/arm/mach-omap2/timer.c
>> @@ -46,7 +46,6 @@
>>  #include <asm/smp_twd.h>
>>  #include <asm/sched_clock.h>
>>  
>> -#include <asm/arch_timer.h>
>>  #include "omap_hwmod.h"
>>  #include "omap_device.h"
>>  #include <plat/counter-32k.h>
>> @@ -624,9 +623,7 @@ void __init omap5_realtime_timer_init(void)
>>  	omap5_sync32k_timer_init();
>>  	realtime_counter_init();
>>  
>> -	err = arch_timer_of_register();
>> -	if (err)
>> -		pr_err("%s: arch_timer_register failed %d\n", __func__, err);
>> +        clocksource_of_init();
>>  }
>>  #endif /* CONFIG_SOC_OMAP5 */
>>  
>> diff --git a/arch/arm/mach-shmobile/board-kzm9d.c b/arch/arm/mach-shmobile/board-kzm9d.c
>> index c254782..c016ccd 100644
>> --- a/arch/arm/mach-shmobile/board-kzm9d.c
>> +++ b/arch/arm/mach-shmobile/board-kzm9d.c
>> @@ -90,6 +90,5 @@ DT_MACHINE_START(KZM9D_DT, "kzm9d")
>>  	.init_irq	= emev2_init_irq,
>>  	.init_machine	= kzm9d_add_standard_devices,
>>  	.init_late	= shmobile_init_late,
>> -	.init_time	= shmobile_timer_init,
>>  	.dt_compat	= kzm9d_boards_compat_dt,
>>  MACHINE_END
>> diff --git a/arch/arm/mach-shmobile/include/mach/common.h b/arch/arm/mach-shmobile/include/mach/common.h
>> index e48606d..5efc0f0 100644
>> --- a/arch/arm/mach-shmobile/include/mach/common.h
>> +++ b/arch/arm/mach-shmobile/include/mach/common.h
>> @@ -2,7 +2,6 @@
>>  #define __ARCH_MACH_COMMON_H
>>  
>>  extern void shmobile_earlytimer_init(void);
>> -extern void shmobile_timer_init(void);
>>  extern void shmobile_setup_delay(unsigned int max_cpu_core_mhz,
>>  			 unsigned int mult, unsigned int div);
>>  struct twd_local_timer;
>> diff --git a/arch/arm/mach-shmobile/setup-emev2.c b/arch/arm/mach-shmobile/setup-emev2.c
>> index 47662a5..4e38a66 100644
>> --- a/arch/arm/mach-shmobile/setup-emev2.c
>> +++ b/arch/arm/mach-shmobile/setup-emev2.c
>> @@ -456,7 +456,6 @@ DT_MACHINE_START(EMEV2_DT, "Generic Emma Mobile EV2 (Flattened Device Tree)")
>>  	.nr_irqs	= NR_IRQS_LEGACY,
>>  	.init_irq	= irqchip_init,
>>  	.init_machine	= emev2_add_standard_devices_dt,
>> -	.init_time	= shmobile_timer_init,
>>  	.dt_compat	= emev2_boards_compat_dt,
>>  MACHINE_END
>>  
>> diff --git a/arch/arm/mach-shmobile/setup-r8a7740.c b/arch/arm/mach-shmobile/setup-r8a7740.c
>> index 8b85d4d..104b474 100644
>> --- a/arch/arm/mach-shmobile/setup-r8a7740.c
>> +++ b/arch/arm/mach-shmobile/setup-r8a7740.c
>> @@ -906,7 +906,6 @@ DT_MACHINE_START(R8A7740_DT, "Generic R8A7740 (Flattened Device Tree)")
>>  	.init_irq	= r8a7740_init_irq,
>>  	.handle_irq	= shmobile_handle_irq_intc,
>>  	.init_machine	= r8a7740_add_standard_devices_dt,
>> -	.init_time	= shmobile_timer_init,
>>  	.dt_compat	= r8a7740_boards_compat_dt,
>>  MACHINE_END
>>  
>> diff --git a/arch/arm/mach-shmobile/setup-sh7372.c b/arch/arm/mach-shmobile/setup-sh7372.c
>> index 59c7146..5502d62 100644
>> --- a/arch/arm/mach-shmobile/setup-sh7372.c
>> +++ b/arch/arm/mach-shmobile/setup-sh7372.c
>> @@ -1175,7 +1175,6 @@ DT_MACHINE_START(SH7372_DT, "Generic SH7372 (Flattened Device Tree)")
>>  	.init_irq	= sh7372_init_irq,
>>  	.handle_irq	= shmobile_handle_irq_intc,
>>  	.init_machine	= sh7372_add_standard_devices_dt,
>> -	.init_time	= shmobile_timer_init,
>>  	.dt_compat	= sh7372_boards_compat_dt,
>>  MACHINE_END
>>  
>> diff --git a/arch/arm/mach-shmobile/setup-sh73a0.c b/arch/arm/mach-shmobile/setup-sh73a0.c
>> index bdab575..ea66316 100644
>> --- a/arch/arm/mach-shmobile/setup-sh73a0.c
>> +++ b/arch/arm/mach-shmobile/setup-sh73a0.c
>> @@ -923,7 +923,6 @@ DT_MACHINE_START(SH73A0_DT, "Generic SH73A0 (Flattened Device Tree)")
>>  	.nr_irqs	= NR_IRQS_LEGACY,
>>  	.init_irq	= sh73a0_init_irq_dt,
>>  	.init_machine	= sh73a0_add_standard_devices_dt,
>> -	.init_time	= shmobile_timer_init,
>>  	.dt_compat	= sh73a0_boards_compat_dt,
>>  MACHINE_END
>>  #endif /* CONFIG_USE_OF */
>> diff --git a/arch/arm/mach-shmobile/timer.c b/arch/arm/mach-shmobile/timer.c
>> index 3d16d4d..add2f15 100644
>> --- a/arch/arm/mach-shmobile/timer.c
>> +++ b/arch/arm/mach-shmobile/timer.c
>> @@ -60,9 +60,3 @@ void __init shmobile_earlytimer_init(void)
>>  {
>>  	late_time_init = shmobile_late_time_init;
>>  }
>> -
>> -void __init shmobile_timer_init(void)
>> -{
>> -	arch_timer_of_register();
>> -	arch_timer_sched_clock_init();
>> -}
>> diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c
>> index d0ad789..6215717 100644
>> --- a/arch/arm/mach-vexpress/v2m.c
>> +++ b/arch/arm/mach-vexpress/v2m.c
>> @@ -1,6 +1,7 @@
>>  /*
>>   * Versatile Express V2M Motherboard Support
>>   */
>> +#include <linux/clocksource.h>
>>  #include <linux/device.h>
>>  #include <linux/amba/bus.h>
>>  #include <linux/amba/mmci.h>
>> @@ -23,7 +24,6 @@
>>  #include <linux/regulator/machine.h>
>>  #include <linux/vexpress.h>
>>  
>> -#include <asm/arch_timer.h>
>>  #include <asm/mach-types.h>
>>  #include <asm/sizes.h>
>>  #include <asm/mach/arch.h>
>> @@ -446,10 +446,7 @@ static void __init v2m_dt_timer_init(void)
>>  				irq_of_parse_and_map(node, 0));
>>  	}
>>  
>> -	arch_timer_of_register();
>> -
>> -	if (arch_timer_sched_clock_init() != 0)
>> -		versatile_sched_clock_init(vexpress_get_24mhz_clock_base(),
>> +	versatile_sched_clock_init(vexpress_get_24mhz_clock_base(),
>>  				24000000);
>>  }
>>  
>> diff --git a/arch/arm/mach-virt/virt.c b/arch/arm/mach-virt/virt.c
>> index 31666f6..adc0945 100644
>> --- a/arch/arm/mach-virt/virt.c
>> +++ b/arch/arm/mach-virt/virt.c
>> @@ -23,21 +23,13 @@
>>  #include <linux/of_platform.h>
>>  #include <linux/smp.h>
>>  
>> -#include <asm/arch_timer.h>
>>  #include <asm/mach/arch.h>
>> -#include <asm/mach/time.h>
>>  
>>  static void __init virt_init(void)
>>  {
>>  	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
>>  }
>>  
>> -static void __init virt_timer_init(void)
>> -{
>> -	WARN_ON(arch_timer_of_register() != 0);
>> -	WARN_ON(arch_timer_sched_clock_init() != 0);
>> -}
>> -
>>  static const char *virt_dt_match[] = {
>>  	"linux,dummy-virt",
>>  	NULL
>> @@ -47,7 +39,6 @@ extern struct smp_operations virt_smp_ops;
>>  
>>  DT_MACHINE_START(VIRT, "Dummy Virtual Machine")
>>  	.init_irq	= irqchip_init,
>> -	.init_time	= virt_timer_init,
>>  	.init_machine	= virt_init,
>>  	.smp		= smp_ops(virt_smp_ops),
>>  	.dt_compat	= virt_dt_match,
>> diff --git a/arch/arm64/include/asm/arch_timer.h b/arch/arm64/include/asm/arch_timer.h
>> index 91e2a6a..bf6ab242 100644
>> --- a/arch/arm64/include/asm/arch_timer.h
>> +++ b/arch/arm64/include/asm/arch_timer.h
>> @@ -130,4 +130,9 @@ static inline u64 arch_counter_get_cntvct(void)
>>  	return cval;
>>  }
>>  
>> +static inline int arch_timer_arch_init(void)
>> +{
>> +	return 0;
>> +}
>> +
>>  #endif
>> diff --git a/arch/arm64/kernel/time.c b/arch/arm64/kernel/time.c
>> index b0ef18d..a551f88 100644
>> --- a/arch/arm64/kernel/time.c
>> +++ b/arch/arm64/kernel/time.c
>> @@ -32,6 +32,7 @@
>>  #include <linux/timer.h>
>>  #include <linux/irq.h>
>>  #include <linux/delay.h>
>> +#include <linux/clocksource.h>
>>  
>>  #include <clocksource/arm_arch_timer.h>
>>  
>> @@ -77,10 +78,11 @@ void __init time_init(void)
>>  {
>>  	u32 arch_timer_rate;
>>  
>> -	if (arch_timer_init())
>> -		panic("Unable to initialise architected timer.\n");
>> +	clocksource_of_init();
>>  
>>  	arch_timer_rate = arch_timer_get_rate();
>> +	if (!arch_timer_rate)
>> +		panic("Unable to initialise architected timer.\n");
>>  
>>  	/* Cache the sched_clock multiplier to save a divide in the hot path. */
>>  	sched_clock_mult = NSEC_PER_SEC / arch_timer_rate;
>> diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
>> index e507ab7..d98e7e1 100644
>> --- a/drivers/clocksource/Kconfig
>> +++ b/drivers/clocksource/Kconfig
>> @@ -62,6 +62,7 @@ config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
>>  
>>  config ARM_ARCH_TIMER
>>  	bool
>> +	select CLKSRC_OF if OF
>>  
>>  config CLKSRC_METAG_GENERIC
>>  	def_bool y if METAG
>> diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
>> index d7ad425..122ff05 100644
>> --- a/drivers/clocksource/arm_arch_timer.c
>> +++ b/drivers/clocksource/arm_arch_timer.c
>> @@ -337,22 +337,14 @@ out:
>>  	return err;
>>  }
>>  
>> -static const struct of_device_id arch_timer_of_match[] __initconst = {
>> -	{ .compatible	= "arm,armv7-timer",	},
>> -	{ .compatible	= "arm,armv8-timer",	},
>> -	{},
>> -};
>> -
>> -int __init arch_timer_init(void)
>> +static void __init arch_timer_init(struct device_node *np)
>>  {
>> -	struct device_node *np;
>>  	u32 freq;
>>  	int i;
>>  
>> -	np = of_find_matching_node(NULL, arch_timer_of_match);
>> -	if (!np) {
>> -		pr_err("arch_timer: can't find DT node\n");
>> -		return -ENODEV;
>> +	if (arch_timer_get_rate()) {
>> +		pr_warn("arch_timer: multiple nodes in dt, skipping\n");
>> +		return;
>>  	}
>>  
>>  	/* Try to determine the frequency from the device tree or CNTFRQ */
>> @@ -378,7 +370,7 @@ int __init arch_timer_init(void)
>>  		if (!arch_timer_ppi[PHYS_SECURE_PPI] ||
>>  		    !arch_timer_ppi[PHYS_NONSECURE_PPI]) {
>>  			pr_warn("arch_timer: No interrupt available, giving up\n");
>> -			return -EINVAL;
>> +			return;
>>  		}
>>  	}
>>  
>> @@ -387,5 +379,8 @@ int __init arch_timer_init(void)
>>  	else
>>  		arch_timer_read_counter = arch_counter_get_cntpct;
>>  
>> -	return arch_timer_register();
>> +	arch_timer_register();
>> +	arch_timer_arch_init();
>>  }
>> +CLOCKSOURCE_OF_DECLARE(armv7_arch_timer, "arm,armv7-timer", arch_timer_init);
>> +CLOCKSOURCE_OF_DECLARE(armv8_arch_timer, "arm,armv8-timer", arch_timer_init);
>> diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h
>> index 2603267..e6c9c4c 100644
>> --- a/include/clocksource/arm_arch_timer.h
>> +++ b/include/clocksource/arm_arch_timer.h
>> @@ -31,18 +31,12 @@
>>  
>>  #ifdef CONFIG_ARM_ARCH_TIMER
>>  
>> -extern int arch_timer_init(void);
>>  extern u32 arch_timer_get_rate(void);
>>  extern u64 (*arch_timer_read_counter)(void);
>>  extern struct timecounter *arch_timer_get_timecounter(void);
>>  
>>  #else
>>  
>> -static inline int arch_timer_init(void)
>> -{
>> -	return -ENXIO;
>> -}
>> -
>>  static inline u32 arch_timer_get_rate(void)
>>  {
>>  	return 0;
>> -- 
>> 1.7.10.4
>>
>> --
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>>