OMAP clock: drop clk_get_usecount()

This function is race-prone and mistakenly conveys the impression to
drivers that it is part of the clock interface.  Get rid of it: core
code that absolutely needs this can just check clk->usecount.  Drivers
should not use it at all.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/pm-debug.c

@@ -93,7 +93,7 @@ void serial_console_sleep(int enable)
 
 	if (enable) {
 		BUG_ON(serial_console_clock_disabled);
-		if (clk_get_usecount(console_fclk) == 0)
+		if (console_fclk->usecount == 0)
 			return;
 		if ((int) serial_console_next_disable - (int) omap2_read_32k_sync_counter() >= 0)
 			return;

arch/arm/mach-omap2/pm24xx.c

@@ -249,7 +249,7 @@ static int omap2_can_sleep(void)
 		return 0;
 	if (atomic_read(&sleep_block) > 0)
 		return 0;
-	if (clk_get_usecount(osc_ck) > 1)
+	if (osc_ck->usecount > 1)
 		return 0;
 	if (omap_dma_running())
 		return 0;

arch/arm/plat-omap/clock.c

@@ -260,22 +260,6 @@ out:
 }
 EXPORT_SYMBOL(clk_disable);
 
-int clk_get_usecount(struct clk *clk)
-{
-	unsigned long flags;
-	int ret = 0;
-
-	if (clk == NULL || IS_ERR(clk))
-		return 0;
-
-	spin_lock_irqsave(&clockfw_lock, flags);
-	ret = clk->usecount;
-	spin_unlock_irqrestore(&clockfw_lock, flags);
-
-	return ret;
-}
-EXPORT_SYMBOL(clk_get_usecount);
-
 unsigned long clk_get_rate(struct clk *clk)
 {
 	unsigned long flags;

arch/arm/plat-omap/include/mach/clock.h

@@ -142,7 +142,6 @@ extern void followparent_recalc(struct clk *clk, unsigned long parent_rate,
 				u8 rate_storage);
 extern void clk_allow_idle(struct clk *clk);
 extern void clk_deny_idle(struct clk *clk);
-extern int clk_get_usecount(struct clk *clk);
 extern void clk_enable_init_clocks(void);
 #ifdef CONFIG_CPU_FREQ
 extern void clk_init_cpufreq_table(struct cpufreq_frequency_table **table);