ARM: OMAP2: Clockdomain: Integrate OMAP3 clocks with clockdomain code

This patch integrates the OMAP3 clock tree with the clockdomain code.
This patch:

- marks OMAP34xx clocks with their corresponding clockdomain.

- adds code to convert the clockdomain name to a clockdomain pointer in the
  struct clk during clk_register().

- modifies OMAP2 clock usecounting to call into the clockdomain code
  when clocks are enabled or disabled.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 42 insertions, 4 deletions

diff --git a/arch/arm/mach-omap2/clock.c b/arch/arm/mach-omap2/clock.c
index 1d891e4a6933..aa9b37370d44 100644
--- a/arch/arm/mach-omap2/clock.c
+++ b/arch/arm/mach-omap2/clock.c
@@ -26,6 +26,7 @@
 #include <asm/io.h>
 
 #include <mach/clock.h>
+#include <mach/clockdomain.h>
 #include <mach/sram.h>
 #include <mach/cpu.h>
 #include <asm/div64.h>
@@ -62,10 +63,36 @@
 u8 cpu_mask;
 
 /*-------------------------------------------------------------------------
- * Omap2 specific clock functions
+ * OMAP2/3 specific clock functions
  *-------------------------------------------------------------------------*/
 
 /**
+ * omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk
+ * @clk: OMAP clock struct ptr to use
+ *
+ * Convert a clockdomain name stored in a struct clk 'clk' into a
+ * clockdomain pointer, and save it into the struct clk.  Intended to be
+ * called during clk_register().  No return value.
+ */
+void omap2_init_clk_clkdm(struct clk *clk)
+{
+        struct clockdomain *clkdm;
+
+        if (!clk->clkdm_name)
+                return;
+
+        clkdm = clkdm_lookup(clk->clkdm_name);
+        if (clkdm) {
+                pr_debug("clock: associated clk %s to clkdm %s\n",
+                         clk->name, clk->clkdm_name);
+                clk->clkdm = clkdm;
+        } else {
+                pr_debug("clock: could not associate clk %s to "
+                         "clkdm %s\n", clk->name, clk->clkdm_name);
+        }
+}
+
+/**
  * omap2_init_clksel_parent - set a clksel clk's parent field from the hardware
  * @clk: OMAP clock struct ptr to use
  *
@@ -308,6 +335,9 @@ void omap2_clk_disable(struct clk *clk)
                 _omap2_clk_disable(clk);
                 if (likely((u32)clk->parent))
                         omap2_clk_disable(clk->parent);
+                if (clk->clkdm)
+                        omap2_clkdm_clk_disable(clk->clkdm, clk);
+
         }
 }
 
@@ -324,11 +354,19 @@ int omap2_clk_enable(struct clk *clk)
                         return ret;
                 }
 
+                if (clk->clkdm)
+                        omap2_clkdm_clk_enable(clk->clkdm, clk);
+
                 ret = _omap2_clk_enable(clk);
 
-                if (unlikely(ret != 0) && clk->parent) {
-                        omap2_clk_disable(clk->parent);
-                        clk->usecount--;
+                if (unlikely(ret != 0)) {
+                        if (clk->clkdm)
+                                omap2_clkdm_clk_disable(clk->clkdm, clk);
+
+                        if (clk->parent) {
+                                omap2_clk_disable(clk->parent);
+                                clk->usecount--;
+                        }
                 }
         }