#ifdef CONFIG_COMMON_CLK
/**
- * clk_notifier_register: register a clock rate-change notifier callback
+ * clk_notifier_register - register a clock rate-change notifier callback
* @clk: clock whose rate we are interested in
* @nb: notifier block with callback function pointer
*
int clk_notifier_register(struct clk *clk, struct notifier_block *nb);
/**
- * clk_notifier_unregister: unregister a clock rate-change notifier callback
+ * clk_notifier_unregister - unregister a clock rate-change notifier callback
* @clk: clock whose rate we are no longer interested in
* @nb: notifier block which will be unregistered
*/
#endif
+#ifdef CONFIG_HAVE_CLK_PREPARE
/**
* clk_prepare - prepare a clock source
* @clk: clock source
*
* Must not be called from within atomic context.
*/
-#ifdef CONFIG_HAVE_CLK_PREPARE
int clk_prepare(struct clk *clk);
int __must_check clk_bulk_prepare(int num_clks,
const struct clk_bulk_data *clks);
+
+/**
+ * clk_is_enabled_when_prepared - indicate if preparing a clock also enables it.
+ * @clk: clock source
+ *
+ * Returns true if clk_prepare() implicitly enables the clock, effectively
+ * making clk_enable()/clk_disable() no-ops, false otherwise.
+ *
+ * This is of interest mainly to the power management code where actually
+ * disabling the clock also requires unpreparing it to have any material
+ * effect.
+ *
+ * Regardless of the value returned here, the caller must always invoke
+ * clk_enable() or clk_prepare_enable() and counterparts for usage counts
+ * to be right.
+ */
+bool clk_is_enabled_when_prepared(struct clk *clk);
#else
static inline int clk_prepare(struct clk *clk)
{
might_sleep();
return 0;
}
+
+static inline bool clk_is_enabled_when_prepared(struct clk *clk)
+{
+ return false;
+}
#endif
/**