[ARM] sa1100: match clock by dev_name(dev)

Continuing the move away from implementations which give an excuse
for other bad implementations, convert SA1100 to lookup its singular
clock by dev_name(dev) rather than by id.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-sa1100/clock.c

@@ -3,6 +3,7 @@
  */
 #include <linux/module.h>
 #include <linux/kernel.h>
+#include <linux/device.h>
 #include <linux/list.h>
 #include <linux/errno.h>
 #include <linux/err.h>
@@ -14,36 +15,39 @@
 #include <mach/hardware.h>
 
 /*
- * Very simple clock implementation - we only have one clock to
- * deal with at the moment, so we only match using the "name".
+ * Very simple clock implementation - we only have one clock to deal with.
  */
 struct clk {
-	struct list_head	node;
-	unsigned long		rate;
-	const char		*name;
 	unsigned int		enabled;
-	void			(*enable)(void);
-	void			(*disable)(void);
 };
 
-static LIST_HEAD(clocks);
-static DEFINE_MUTEX(clocks_mutex);
+static void clk_gpio27_enable(void)
+{
+	/*
+	 * First, set up the 3.6864MHz clock on GPIO 27 for the SA-1111:
+	 * (SA-1110 Developer's Manual, section 9.1.2.1)
+	 */
+	GAFR |= GPIO_32_768kHz;
+	GPDR |= GPIO_32_768kHz;
+	TUCR = TUCR_3_6864MHz;
+}
+
+static void clk_gpio27_disable(void)
+{
+	TUCR = 0;
+	GPDR &= ~GPIO_32_768kHz;
+	GAFR &= ~GPIO_32_768kHz;
+}
+
+static struct clk clk_gpio27;
+
 static DEFINE_SPINLOCK(clocks_lock);
 
 struct clk *clk_get(struct device *dev, const char *id)
 {
-	struct clk *p, *clk = ERR_PTR(-ENOENT);
-
-	mutex_lock(&clocks_mutex);
-	list_for_each_entry(p, &clocks, node) {
-		if (strcmp(id, p->name) == 0) {
-			clk = p;
-			break;
-		}
-	}
-	mutex_unlock(&clocks_mutex);
+	const char *devname = dev_name(dev);
 
-	return clk;
+	return strcmp(devname, "sa1111.0") ? ERR_PTR(-ENOENT) : &clk_gpio27;
 }
 EXPORT_SYMBOL(clk_get);
 
@@ -58,7 +62,7 @@ int clk_enable(struct clk *clk)
 
 	spin_lock_irqsave(&clocks_lock, flags);
 	if (clk->enabled++ == 0)
-		clk->enable();
+		clk_gpio27_enable();
 	spin_unlock_irqrestore(&clocks_lock, flags);
 	return 0;
 }
@@ -72,63 +76,13 @@ void clk_disable(struct clk *clk)
 
 	spin_lock_irqsave(&clocks_lock, flags);
 	if (--clk->enabled == 0)
-		clk->disable();
+		clk_gpio27_disable();
 	spin_unlock_irqrestore(&clocks_lock, flags);
 }
 EXPORT_SYMBOL(clk_disable);
 
 unsigned long clk_get_rate(struct clk *clk)
 {
-	return clk->rate;
+	return 3686400;
 }
 EXPORT_SYMBOL(clk_get_rate);
-
-
-static void clk_gpio27_enable(void)
-{
-	/*
-	 * First, set up the 3.6864MHz clock on GPIO 27 for the SA-1111:
-	 * (SA-1110 Developer's Manual, section 9.1.2.1)
-	 */
-	GAFR |= GPIO_32_768kHz;
-	GPDR |= GPIO_32_768kHz;
-	TUCR = TUCR_3_6864MHz;
-}
-
-static void clk_gpio27_disable(void)
-{
-	TUCR = 0;
-	GPDR &= ~GPIO_32_768kHz;
-	GAFR &= ~GPIO_32_768kHz;
-}
-
-static struct clk clk_gpio27 = {
-	.name		= "SA1111_CLK",
-	.rate		= 3686400,
-	.enable		= clk_gpio27_enable,
-	.disable	= clk_gpio27_disable,
-};
-
-int clk_register(struct clk *clk)
-{
-	mutex_lock(&clocks_mutex);
-	list_add(&clk->node, &clocks);
-	mutex_unlock(&clocks_mutex);
-	return 0;
-}
-EXPORT_SYMBOL(clk_register);
-
-void clk_unregister(struct clk *clk)
-{
-	mutex_lock(&clocks_mutex);
-	list_del(&clk->node);
-	mutex_unlock(&clocks_mutex);
-}
-EXPORT_SYMBOL(clk_unregister);
-
-static int __init clk_init(void)
-{
-	clk_register(&clk_gpio27);
-	return 0;
-}
-arch_initcall(clk_init);