[PATCH v2 03/12] clocksource: sti: Provide 'use timer as sched clock' capability

Lee Jones
2015-05-12T13:02:20Z

drivers/clocksource/clksrc_st_lpc.c | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/drivers/clocksource/clksrc_st_lpc.c b/drivers/clocksource/clksrc_st_lpc.c
index 1ad1714..90f5bb8 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 +39,11 @@ static void st_clksrc_reset(void)
writel_relaxed(1, ddata.base + LPC_LPT_START_OFF);
}

+static u64 notrace st_clksrc_sched_clock_read(void)
+{
+ return (u64)readl_relaxed(ddata.base + LPC_LPT_LSB_OFF);
+}
+
static int __init st_clksrc_init(void)
{
unsigned long rate;
@@ -47,6 +53,8 @@ static int __init st_clksrc_init(void)

rate = clk_get_rate(ddata.clk);

+ sched_clock_register(st_clksrc_sched_clock_read, 32, rate);
+
ret = clocksource_mmio_init(ddata.base + LPC_LPT_LSB_OFF,
"clksrc-st-lpc", rate, 300, 32,
clocksource_mmio_readl_up);
--
1.9.1