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clocksource / arm_arch_timer: Convert to ACPI probing 

It is now absolutely trivial to convert the arch timer driver to
use ACPI probing, just like its DT counterpart.

Let's enjoy another crapectomy.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Marc Zyngier 2015-09-28 15:49:17 +01:00 committed by Rafael J. Wysocki
parent aad83b15aa
commit ae281cbd26
4 changed files with 2 additions and 21 deletions
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6
arch/arm64/kernel/time.c
View File

@ -71,12 +71,6 @@ void __init time_init(void)
tick_setup_hrtimer_broadcast();
/*
* Since ACPI or FDT will only one be available in the system,
* we can use acpi_generic_timer_init() here safely
*/
acpi_generic_timer_init();
arch_timer_rate = arch_timer_get_rate();
if (!arch_timer_rate)
panic("Unable to initialise architected timer.\n");

1
drivers/clocksource/Kconfig
View File

@ -131,6 +131,7 @@ config CLKSRC_STM32
config ARM_ARCH_TIMER
bool
select CLKSRC_OF if OF
select CLKSRC_ACPI if ACPI
config ARM_ARCH_TIMER_EVTSTREAM
bool "Support for ARM architected timer event stream generation"

10
drivers/clocksource/arm_arch_timer.c
View File

@ -864,13 +864,5 @@ static int __init arch_timer_acpi_init(struct acpi_table_header *table)
arch_timer_init();
return 0;
}
/* Initialize all the generic timers presented in GTDT */
void __init acpi_generic_timer_init(void)
{
if (acpi_disabled)
return;
acpi_table_parse(ACPI_SIG_GTDT, arch_timer_acpi_init);
}
CLOCKSOURCE_ACPI_DECLARE(arch_timer, ACPI_SIG_GTDT, arch_timer_acpi_init);
#endif

6
include/linux/clocksource.h
View File

@ -252,12 +252,6 @@ extern void clocksource_of_init(void);
static inline void clocksource_of_init(void) {}
#endif
#ifdef CONFIG_ACPI
void acpi_generic_timer_init(void);
#else
static inline void acpi_generic_timer_init(void) { }
#endif
#define CLOCKSOURCE_ACPI_DECLARE(name, table_id, fn) \
ACPI_DECLARE_PROBE_ENTRY(clksrc, name, table_id, 0, NULL, 0, fn)