aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMagnus Damm <damm@opensource.se>2011-04-25 22:38:37 +0900
committerPaul Mundt <lethal@linux-sh.org>2011-05-23 14:34:04 +0900
commit0aeac458d9ebea5f0dc483e2d3f2c06bfa520c02 (patch)
tree780670cb4250434930199a28eddcdcd266d83d96
parentclocksource: sh_cmt: Runtime PM support (diff)
downloadlinux-dev-0aeac458d9ebea5f0dc483e2d3f2c06bfa520c02.tar.xz
linux-dev-0aeac458d9ebea5f0dc483e2d3f2c06bfa520c02.zip
clocksource: sh_tmu: __clocksource_updatefreq_hz() update
This patch updates the clocksource part of the TMU driver to make use of the __clocksource_updatefreq_hz() function. Without this patch the old code uses clocksource_register() together with a hack that assumes a never changing clock rate (see clk_enable(), clk_get_rate() and clk_disable()). The patch uses clocksource_register_hz() with 1 Hz as initial value, then lets the ->enable() callback update the value with __clocksource_updatefreq_hz() once the struct clk has been enabled and the frequency is stable. Signed-off-by: Magnus Damm <damm@opensource.se> Acked-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to '')
-rw-r--r--drivers/clocksource/sh_tmu.c19
1 files changed, 8 insertions, 11 deletions
diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index 36aba9923060..808135768617 100644
--- a/drivers/clocksource/sh_tmu.c
+++ b/drivers/clocksource/sh_tmu.c
@@ -199,8 +199,12 @@ static cycle_t sh_tmu_clocksource_read(struct clocksource *cs)
static int sh_tmu_clocksource_enable(struct clocksource *cs)
{
struct sh_tmu_priv *p = cs_to_sh_tmu(cs);
+ int ret;
- return sh_tmu_enable(p);
+ ret = sh_tmu_enable(p);
+ if (!ret)
+ __clocksource_updatefreq_hz(cs, p->rate);
+ return ret;
}
static void sh_tmu_clocksource_disable(struct clocksource *cs)
@@ -221,17 +225,10 @@ static int sh_tmu_register_clocksource(struct sh_tmu_priv *p,
cs->mask = CLOCKSOURCE_MASK(32);
cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
- /* clk_get_rate() needs an enabled clock */
- clk_enable(p->clk);
- /* channel will be configured at parent clock / 4 */
- p->rate = clk_get_rate(p->clk) / 4;
- clk_disable(p->clk);
- /* TODO: calculate good shift from rate and counter bit width */
- cs->shift = 10;
- cs->mult = clocksource_hz2mult(p->rate, cs->shift);
-
dev_info(&p->pdev->dev, "used as clock source\n");
- clocksource_register(cs);
+
+ /* Register with dummy 1 Hz value, gets updated in ->enable() */
+ clocksource_register_hz(cs, 1);
return 0;
}