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Subject[RESEND PATCH v2 4/6] clocksource: kona: Add basic use of external clock
Date
When an clock handle is specified in the device tree, enable it and use
it to determine the external clock frequency.

Signed-off-by: Tim Kryger <tim.kryger@linaro.org>
Reviewed-by: Markus Mayer <markus.mayer@linaro.org>
Reviewed-by: Matt Porter <matt.porter@linaro.org>
---
drivers/clocksource/bcm_kona_timer.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c
index 0d7d8c3..fd11f96 100644
--- a/drivers/clocksource/bcm_kona_timer.c
+++ b/drivers/clocksource/bcm_kona_timer.c
@@ -17,6 +17,7 @@
#include <linux/jiffies.h>
#include <linux/clockchips.h>
#include <linux/types.h>
+#include <linux/clk.h>

#include <linux/io.h>
#include <asm/mach/time.h>
@@ -107,11 +108,18 @@ static const struct of_device_id bcm_timer_ids[] __initconst = {
static void __init kona_timers_init(struct device_node *node)
{
u32 freq;
+ struct clk *external_clk;

- if (!of_property_read_u32(node, "clock-frequency", &freq))
+ external_clk = of_clk_get_by_name(node, NULL);
+
+ if (!IS_ERR(external_clk)) {
+ arch_timer_rate = clk_get_rate(external_clk);
+ clk_prepare_enable(external_clk);
+ } else if (!of_property_read_u32(node, "clock-frequency", &freq)) {
arch_timer_rate = freq;
- else
- panic("clock-frequency not set in the .dts file");
+ } else {
+ panic("neither clock-frequency or clocks handle in .dts file");
+ }

/* Setup IRQ numbers */
timers.tmr_irq = irq_of_parse_and_map(node, 0);
--
1.8.0.1



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