ARM: davinci: Make __clk_{enable,disable} functions public

In some cases, there is a need to enable a clock as part of
clock enable callback of a different clock. For example, USB
2.0 PHY clock enable requires USB 2.0 clock to be enabled.
In this case, it is safe to instead call __clk_enable()
since the clock framework lock is already taken. Calling
clk_enable() causes recursive locking error.

A similar case arises in the clock disable path.

To enable such usage, make __clk_{enable,disable} functions
publicly available outside of clock.c. Also, call them
davinci_clk_{enable|disable} now to be consistent with how
other davinci-specific clock functions are named.

Note that these functions are not exported to drivers. They
are meant for usage in platform specific clock management
code.

Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Suggested-by: David Lechner <david@lechnology.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

arch/arm/mach-davinci/clock.c

@@ -31,10 +31,10 @@ static LIST_HEAD(clocks);
 static DEFINE_MUTEX(clocks_mutex);
 static DEFINE_SPINLOCK(clockfw_lock);
 
-static void __clk_enable(struct clk *clk)
+void davinci_clk_enable(struct clk *clk)
 {
 	if (clk->parent)
-		__clk_enable(clk->parent);
+		davinci_clk_enable(clk->parent);
 	if (clk->usecount++ == 0) {
 		if (clk->flags & CLK_PSC)
 			davinci_psc_config(clk->domain, clk->gpsc, clk->lpsc,
@@ -44,7 +44,7 @@ static void __clk_enable(struct clk *clk)
 	}
 }
 
-static void __clk_disable(struct clk *clk)
+void davinci_clk_disable(struct clk *clk)
 {
 	if (WARN_ON(clk->usecount == 0))
 		return;
@@ -56,7 +56,7 @@ static void __clk_disable(struct clk *clk)
 			clk->clk_disable(clk);
 	}
 	if (clk->parent)
-		__clk_disable(clk->parent);
+		davinci_clk_disable(clk->parent);
 }
 
 int davinci_clk_reset(struct clk *clk, bool reset)
@@ -103,7 +103,7 @@ int clk_enable(struct clk *clk)
 		return -EINVAL;
 
 	spin_lock_irqsave(&clockfw_lock, flags);
-	__clk_enable(clk);
+	davinci_clk_enable(clk);
 	spin_unlock_irqrestore(&clockfw_lock, flags);
 
 	return 0;
@@ -118,7 +118,7 @@ void clk_disable(struct clk *clk)
 		return;
 
 	spin_lock_irqsave(&clockfw_lock, flags);
-	__clk_disable(clk);
+	davinci_clk_disable(clk);
 	spin_unlock_irqrestore(&clockfw_lock, flags);
 }
 EXPORT_SYMBOL(clk_disable);

arch/arm/mach-davinci/clock.h

@@ -132,6 +132,8 @@ int davinci_set_sysclk_rate(struct clk *clk, unsigned long rate);
 int davinci_set_refclk_rate(unsigned long rate);
 int davinci_simple_set_rate(struct clk *clk, unsigned long rate);
 int davinci_clk_reset(struct clk *clk, bool reset);
+void davinci_clk_enable(struct clk *clk);
+void davinci_clk_disable(struct clk *clk);
 
 extern struct platform_device davinci_wdt_device;
 extern void davinci_watchdog_reset(struct platform_device *);