clocksource: sh_cmt: __clocksource_updatefreq_hz() update

This patch updates the clocksource part of the CMT 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>

diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index f975d24..dc7c033 100644 (file)
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -416,11 +416,15 @@ static cycle_t sh_cmt_clocksource_read(struct clocksource *cs)
 
 static int sh_cmt_clocksource_enable(struct clocksource *cs)
 {
+       int ret;
        struct sh_cmt_priv *p = cs_to_sh_cmt(cs);
 
        p->total_cycles = 0;
 
-       return sh_cmt_start(p, FLAG_CLOCKSOURCE);
+       ret = sh_cmt_start(p, FLAG_CLOCKSOURCE);
+       if (!ret)
+               __clocksource_updatefreq_hz(cs, p->rate);
+       return ret;
 }
 
 static void sh_cmt_clocksource_disable(struct clocksource *cs)
@@ -448,19 +452,10 @@ static int sh_cmt_register_clocksource(struct sh_cmt_priv *p,
        cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
        cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
 
-       /* clk_get_rate() needs an enabled clock */
-       clk_enable(p->clk);
-       p->rate = clk_get_rate(p->clk) / ((p->width == 16) ? 512 : 8);
-       clk_disable(p->clk);
-
-       /* TODO: calculate good shift from rate and counter bit width */
-       cs->shift = 0;
-       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;
 }