ARM: OMAP: Add function to print clock usecounts

Useful for debugging power management code.

Signed-off-by: Juha Yrjola <juha.yrjola@solidboot.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 35 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index f1179ad4be1b..3d017b04784b 100644
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -33,6 +33,41 @@ static DEFINE_SPINLOCK(clockfw_lock);
 
 static struct clk_functions *arch_clock;
 
+#ifdef CONFIG_PM_DEBUG
+
+static void print_parents(struct clk *clk)
+{
+        struct clk *p;
+        int printed = 0;
+
+        list_for_each_entry(p, &clocks, node) {
+                if (p->parent == clk && p->usecount) {
+                        if (!clk->usecount && !printed) {
+                                printk("MISMATCH: %s\n", clk->name);
+                                printed = 1;
+                        }
+                        printk("\t%-15s\n", p->name);
+                }
+        }
+}
+
+void clk_print_usecounts(void)
+{
+        unsigned long flags;
+        struct clk *p;
+
+        spin_lock_irqsave(&clockfw_lock, flags);
+        list_for_each_entry(p, &clocks, node) {
+                if (p->usecount)
+                        printk("%-15s: %d\n", p->name, p->usecount);
+                print_parents(p);
+
+        }
+        spin_unlock_irqrestore(&clockfw_lock, flags);
+}
+
+#endif
+
 /*-------------------------------------------------------------------------
  * Standard clock functions defined in include/linux/clk.h
  *-------------------------------------------------------------------------*/