[PATCH 1/7] ARM: plat-nomadik: MTU sched_clock as an option
From: Linus Walleij <hidden>
Date: 2011-09-22 13:46:17
Subsystem:
arm port, the rest · Maintainers:
Russell King, Linus Torvalds
From: Mattias Wallin <redacted> This patch makes it possible to configure away the sched_clock part of the MTU timer. Cc: Thomas Gleixner <redacted> Signed-off-by: Mattias Wallin <redacted> Signed-off-by: Jonas Aberg <redacted> Signed-off-by: Linus Walleij <redacted> --- arch/arm/plat-nomadik/Kconfig | 8 +++++++- arch/arm/plat-nomadik/timer.c | 8 ++++---- 2 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/arch/arm/plat-nomadik/Kconfig b/arch/arm/plat-nomadik/Kconfig
index ce65901..bca4914 100644
--- a/arch/arm/plat-nomadik/Kconfig
+++ b/arch/arm/plat-nomadik/Kconfig@@ -15,10 +15,16 @@ if PLAT_NOMADIK config HAS_MTU bool - select HAVE_SCHED_CLOCK help Support for Multi Timer Unit. MTU provides access to multiple interrupt generating programmable 32-bit free running decrementing counters. +config NOMADIK_MTU_SCHED_CLOCK + bool + depends on HAS_MTU + select HAVE_SCHED_CLOCK + help + Use the Multi Timer Unit as the sched_clock. + endif
diff --git a/arch/arm/plat-nomadik/timer.c b/arch/arm/plat-nomadik/timer.c
index ef74e15..bd638c5 100644
--- a/arch/arm/plat-nomadik/timer.c
+++ b/arch/arm/plat-nomadik/timer.c@@ -24,7 +24,7 @@ #include <plat/mtu.h> void __iomem *mtu_base; /* Assigned by machine code */ - +#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK /* * Override the global weak sched_clock symbol with this * local implementation which uses the clocksource to get some
@@ -48,7 +48,7 @@ static void notrace nomadik_update_sched_clock(void) u32 cyc = -readl(mtu_base + MTU_VAL(0)); update_sched_clock(&cd, cyc, (u32)~0); } - +#endif /* Clockevent device: use one-shot mode */ static void nmdk_clkevt_mode(enum clock_event_mode mode, struct clock_event_device *dev)
@@ -153,9 +153,9 @@ void __init nmdk_timer_init(void) rate, 200, 32, clocksource_mmio_readl_down)) pr_err("timer: failed to initialize clock source %s\n", "mtu_0"); - +#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK init_sched_clock(&cd, nomadik_update_sched_clock, 32, rate); - +#endif /* Timer 1 is used for events */ clockevents_calc_mult_shift(&nmdk_clkevt, rate, MTU_MIN_RANGE);
--
1.7.3.2