On Friday 13 July 2012 07:49 PM, Tero Kristo wrote:
This works similarly to e.g. pwrdm_for_each(). Needed by enhanced
usecounting debug functionality that will be added to pm-debug.
OMAP clock framework has its own debugfs entry (/debug/clock) to expose
usecounts for clocks, so does the COMMON clock framework (/debug/clk).
Maybe there isn't one which dumps usecounts for the complete tree,
instead there is one per each clock node.
I agree having a complete dump of the clock tree usecounts can be
useful, but can we keep it in /debug/clock for now?
The reason I am saying this is because once we move from OMAP clock to
COMMON clock, something like what 'omap_clk_for_each' does will
not be possible anyway. We might have to add the support for
dumping complete tree usecounts into the COMMON clock core.
Signed-off-by: Tero Kristo<t-kristo@xxxxxx>
Cc: Paul Walmsley<paul@xxxxxxxxx>
Cc: Kevin Hilman<khilman@xxxxxx>
---
arch/arm/plat-omap/clock.c | 33 +++++++++++++++++++++++++++++++
arch/arm/plat-omap/include/plat/clock.h | 2 +
2 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-omap/clock.c b/arch/arm/plat-omap/clock.c
index 706b7e2..ad9dc59 100644
--- a/arch/arm/plat-omap/clock.c
+++ b/arch/arm/plat-omap/clock.c
@@ -355,6 +355,39 @@ int omap_clk_enable_autoidle_all(void)
return 0;
}
+/**
+ * omap_clk_for_each - call a function for each registered clock
+ * @fn: pointer to callback function
+ * @data: void * data to pass to callback function
+ *
+ * Call @fn for each registered clock, passing @data to each function.
+ * @fn must return 0 for success or any other value for failure. If
+ * @fn returns non-zero, the iteration across clocks will stop and
+ * the non-zero return value will be passed to the caller of
+ * omap_clk_for_each(). @fn is called with clockfw_lock held.
+ */
+int omap_clk_for_each(int (*fn)(struct clk *clk, void *user), void *user)
+{
+ struct clk *c;
+ unsigned long flags;
+ int ret = 0;
+
+ if (!fn)
+ return -EINVAL;
+
+ spin_lock_irqsave(&clockfw_lock, flags);
+
+ list_for_each_entry(c,&clocks, node) {
+ ret = fn(c, user);
+ if (ret)
+ break;
+ }
+
+ spin_unlock_irqrestore(&clockfw_lock, flags);
+
+ return ret;
+}
+
int omap_clk_disable_autoidle_all(void)
{
struct clk *c;
diff --git a/arch/arm/plat-omap/include/plat/clock.h b/arch/arm/plat-omap/include/plat/clock.h
index d0ef57c..998947e 100644
--- a/arch/arm/plat-omap/include/plat/clock.h
+++ b/arch/arm/plat-omap/include/plat/clock.h
@@ -294,6 +294,8 @@ extern void propagate_rate(struct clk *clk);
extern void recalculate_root_clocks(void);
extern unsigned long followparent_recalc(struct clk *clk);
extern void clk_enable_init_clocks(void);
+extern int omap_clk_for_each(int (*fn)(struct clk *clk, void *user),
+ void *user);
unsigned long omap_fixed_divisor_recalc(struct clk *clk);
extern struct clk *omap_clk_get_by_name(const char *name);
extern int omap_clk_enable_autoidle_all(void);
--
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