clocksource: Kona: Print warning rather than panic

Since there may be other clocksources available, this driver should not
trigger a panic simply because it can not determine the frequency of an
external clock.  This change refactors the driver to allow a warning to
be printed in this case instead.

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>
Cc: Christian Daudt <bcm@fixthebug.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: http://lkml.kernel.org/r/1391559304-26558-1-git-send-email-tim.kryger@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 28 insertions, 26 deletions

diff --git a/drivers/clocksource/bcm_kona_timer.c b/drivers/clocksource/bcm_kona_timer.c
index 974b2db2fe10..0595dc6c453e 100644
--- a/drivers/clocksource/bcm_kona_timer.c
+++ b/drivers/clocksource/bcm_kona_timer.c
@@ -99,31 +99,6 @@ kona_timer_get_counter(void *timer_base, uint32_t *msw, uint32_t *lsw)
         return;
 }
 
-static void __init kona_timers_init(struct device_node *node)
-{
-        u32 freq;
-        struct clk *external_clk;
-
-        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("unable to determine clock-frequency");
-        }
-
-        /* Setup IRQ numbers */
-        timers.tmr_irq = irq_of_parse_and_map(node, 0);
-
-        /* Setup IO addresses */
-        timers.tmr_regs = of_iomap(node, 0);
-
-        kona_timer_disable_and_clear(timers.tmr_regs);
-}
-
 static int kona_timer_set_next_event(unsigned long clc,
                                   struct clock_event_device *unused)
 {
@@ -198,7 +173,34 @@ static struct irqaction kona_timer_irq = {
 
 static void __init kona_timer_init(struct device_node *node)
 {
-        kona_timers_init(node);
+        u32 freq;
+        struct clk *external_clk;
+
+        if (!of_device_is_available(node)) {
+                pr_info("Kona Timer v1 marked as disabled in device tree\n");
+                return;
+        }
+
+        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 {
+                pr_err("Kona Timer v1 unable to determine clock-frequency");
+                return;
+        }
+
+        /* Setup IRQ numbers */
+        timers.tmr_irq = irq_of_parse_and_map(node, 0);
+
+        /* Setup IO addresses */
+        timers.tmr_regs = of_iomap(node, 0);
+
+        kona_timer_disable_and_clear(timers.tmr_regs);
+
         kona_timer_clockevents_init();
         setup_irq(timers.tmr_irq, &kona_timer_irq);
         kona_timer_set_next_event((arch_timer_rate / HZ), NULL);