[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>

1 files changed, 32 insertions, 38 deletions

diff --git a/arch/powerpc/sysdev/fsl_soc.c b/arch/powerpc/sysdev/fsl_soc.c
index 642e45e1f160..b6d6bdae95f2 100644
--- a/arch/powerpc/sysdev/fsl_soc.c
+++ b/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,