OMAP clock: track child clocks

[linux-2.6-omap-h63xx.git] / arch / arm / plat-omap / include / mach / clock.h

diff --git a/arch/arm/plat-omap/include/mach/clock.h b/arch/arm/plat-omap/include/mach/clock.h
index 9b1d1f84d0a2e2fc78a2331b782fb52a786bcb81..358bf9eb105cd170f2747a8c6975fd908d041759 100644 (file)
--- a/arch/arm/plat-omap/include/mach/clock.h
+++ b/arch/arm/plat-omap/include/mach/clock.h
@@ -60,6 +60,21 @@ struct dpll_data {
 
 #endif
 
+/**
+ * struct clk_child - used to track the children of a clock
+ * @clk: child struct clk *
+ * @node: list_head
+ * @flags: is this entry allocated in bootmem or slab?  is it deleted?
+ *
+ * One struct clk_child is allocated for each child clock @clk of a
+ * parent clock.  @flags values are listed below and start with CLK_CHILD_*.
+ */
+struct clk_child {
+       struct clk              *clk;
+       struct list_head        node;
+       u8                      flags;
+};
+
 struct clk {
        struct list_head        node;
        struct module           *owner;
@@ -68,6 +83,7 @@ struct clk {
        struct clk              *parent;
        unsigned long           rate;
        unsigned long           temp_rate;
+       struct list_head        children;
        __u32                   flags;
        u32                     enable_reg;
        __u8                    enable_bit;
@@ -132,6 +148,8 @@ extern void clk_enable_init_clocks(void);
 #ifdef CONFIG_CPU_FREQ
 extern void clk_init_cpufreq_table(struct cpufreq_frequency_table **table);
 #endif
+void omap_clk_add_child(struct clk *clk, struct clk *clk2);
+void omap_clk_del_child(struct clk *clk, struct clk *clk2);
 
 /* Clock flags */
 #define RATE_CKCTL             (1 << 0)        /* Main fixed ratio clocks */
@@ -174,6 +192,10 @@ extern void clk_init_cpufreq_table(struct cpufreq_frequency_table **table);
 #define CURRENT_RATE           0
 #define TEMP_RATE              1
 
+/* clk_child flags */
+#define CLK_CHILD_SLAB_ALLOC   (1 << 0)        /* if !set, bootmem was used */
+#define CLK_CHILD_DELETED      (1 << 1)        /* can be reused */
+
 /*
  * clk.prcm_mod flags (possible since only the top byte in clk.prcm_mod
  * is significant)