[POWERPC] fsl_soc: Factor fsl_get_sys_freq() out of the wdt and spi inits.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/sysdev/fsl_soc.c

@@ -75,6 +75,33 @@ phys_addr_t get_immrbase(void)
 
 EXPORT_SYMBOL(get_immrbase);
 
+static u32 sysfreq = -1;
+
+u32 fsl_get_sys_freq(void)
+{
+	struct device_node *soc;
+	const u32 *prop;
+	int size;
+
+	if (sysfreq != -1)
+		return sysfreq;
+
+	soc = of_find_node_by_type(NULL, "soc");
+	if (!soc)
+		return -1;
+
+	prop = of_get_property(soc, "clock-frequency", &size);
+	if (!prop || size != sizeof(*prop) || *prop == 0)
+		prop = of_get_property(soc, "bus-frequency", &size);
+
+	if (prop && size == sizeof(*prop))
+		sysfreq = *prop;
+
+	of_node_put(soc);
+	return sysfreq;
+}
+EXPORT_SYMBOL(fsl_get_sys_freq);
+
 #if defined(CONFIG_CPM2) || defined(CONFIG_QUICC_ENGINE) || defined(CONFIG_8xx)
 
 static u32 brgfreq = -1;
@@ -516,9 +543,9 @@ arch_initcall(fsl_i2c_of_init);
 static int __init mpc83xx_wdt_init(void)
 {
 	struct resource r;
-	struct device_node *soc, *np;
+	struct device_node *np;
 	struct platform_device *dev;
-	const unsigned int *freq;
+	u32 freq = fsl_get_sys_freq();
 	int ret;
 
 	np = of_find_compatible_node(NULL, "watchdog", "mpc83xx_wdt");
@@ -528,19 +555,6 @@ static int __init mpc83xx_wdt_init(void)
 		goto nodev;
 	}
 
-	soc = of_find_node_by_type(NULL, "soc");
-
-	if (!soc) {
-		ret = -ENODEV;
-		goto nosoc;
-	}
-
-	freq = of_get_property(soc, "bus-frequency", NULL);
-	if (!freq) {
-		ret = -ENODEV;
-		goto err;
-	}
-
 	memset(&r, 0, sizeof(r));
 
 	ret = of_address_to_resource(np, 0, &r);
@@ -553,20 +567,16 @@ static int __init mpc83xx_wdt_init(void)
 		goto err;
 	}
 
-	ret = platform_device_add_data(dev, freq, sizeof(int));
+	ret = platform_device_add_data(dev, &freq, sizeof(freq));
 	if (ret)
 		goto unreg;
 
-	of_node_put(soc);
 	of_node_put(np);
-
 	return 0;
 
 unreg:
 	platform_device_unregister(dev);
 err:
-	of_node_put(soc);
-nosoc:
 	of_node_put(np);
 nodev:
 	return ret;
@@ -830,25 +840,9 @@ int __init fsl_spi_init(struct spi_board_info *board_infos,
 	sysclk = get_brgfreq();
 #endif
 	if (sysclk == -1) {
-		struct device_node *np;
-		const u32 *freq;
-		int size;
-
-		np = of_find_node_by_type(NULL, "soc");
-		if (!np)
+		sysclk = fsl_get_sys_freq();
+		if (sysclk == -1)
 			return -ENODEV;
-
-		freq = of_get_property(np, "clock-frequency", &size);
-		if (!freq || size != sizeof(*freq) || *freq == 0) {
-			freq = of_get_property(np, "bus-frequency", &size);
-			if (!freq || size != sizeof(*freq) || *freq == 0) {
-				of_node_put(np);
-				return -ENODEV;
-			}
-		}
-
-		sysclk = *freq;
-		of_node_put(np);
 	}
 
 	ret = of_fsl_spi_probe(NULL, "fsl,spi", sysclk, board_infos,

arch/powerpc/sysdev/fsl_soc.h

@@ -7,6 +7,7 @@
 extern phys_addr_t get_immrbase(void);
 extern u32 get_brgfreq(void);
 extern u32 get_baudrate(void);
+extern u32 fsl_get_sys_freq(void);
 
 struct spi_board_info;