[PATCH 03/12] clocksource: sti: Provide 'use timer as sched clock' capability
From: Lee Jones <hidden>
Date: 2015-05-07 13:39:03
Also in:
linux-arm-kernel, linux-rtc, linux-watchdog, lkml
Subsystem:
arm/sti architecture, clocksource, clockevent drivers, the rest · Maintainers:
Patrice Chotard, Daniel Lezcano, Thomas Gleixner, Linus Torvalds
Signed-off-by: Lee Jones <redacted> --- drivers/clocksource/Kconfig | 8 ++++++++ drivers/clocksource/clksrc_st_lpc.c | 11 +++++++++++ 2 files changed, 19 insertions(+)
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index ac424cf..218daf8 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig@@ -258,4 +258,12 @@ config CLKSRC_ST_LPC help Enable this option to use the Low Power controller timer as clocksource. + +config CLKSRC_ST_LPC_TIMER_SCHED_CLOCK + bool + depends on CLKSRC_ST_LPC + default y + help + Use Low Power controller timer clock source as sched_clock + endmenu
diff --git a/drivers/clocksource/clksrc_st_lpc.c b/drivers/clocksource/clksrc_st_lpc.c
index 18a7dcd0..3d92b26 100644
--- a/drivers/clocksource/clksrc_st_lpc.c
+++ b/drivers/clocksource/clksrc_st_lpc.c@@ -16,6 +16,7 @@ #include <linux/clocksource.h> #include <linux/init.h> #include <linux/of_address.h> +#include <linux/sched_clock.h> #include <linux/slab.h> #include <dt-bindings/mfd/st-lpc.h>
@@ -38,6 +39,13 @@ static void st_clksrc_reset(void) writel_relaxed(1, ddata.base + LPC_LPT_START_OFF); } +#ifdef CONFIG_CLKSRC_ST_LPC_TIMER_SCHED_CLOCK +static u64 notrace st_clksrc_sched_clock_read(void) +{ + return (u64)readl_relaxed(ddata.base + LPC_LPT_LSB_OFF); +} +#endif + static int __init st_clksrc_init(void) { unsigned long rate;
@@ -47,6 +55,9 @@ static int __init st_clksrc_init(void) rate = clk_get_rate(ddata.clk); +#ifdef CONFIG_CLKSRC_ST_LPC_TIMER_SCHED_CLOCK + sched_clock_register(st_clksrc_sched_clock_read, 32, rate); +#endif ret = clocksource_mmio_init(ddata.base + LPC_LPT_LSB_OFF, "clksrc-st-lpc", rate, 300, 32, clocksource_mmio_readl_up);
--
1.9.1