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authorWolfgang Denk <wd@denx.de>2009-06-17 00:30:22 -0600
committerGrant Likely <grant.likely@secretlab.ca>2009-06-17 00:30:22 -0600
commit87c441e54dfcf9f45593ecaf68e7e18ea53d5e13 (patch)
tree6a986caab77412a90ffe8c5d8788bc1216b10ed8 /arch/powerpc/sysdev/mpc5xxx_clocks.c
parentc155ee10c212254e9cdfe7b3eab4e8c13990c231 (diff)
powerpc/5xxx: Add common mpc5xxx_get_bus_frequency() function
So far, MPC512x used mpc512x_find_ips_freq() to get the bus frequency, while MPC52xx used mpc52xx_find_ipb_freq(). Despite the different clock names (IPS vs. IPB) the code was identical. Use common code for both processor families. Signed-off-by: Wolfgang Denk <wd@denx.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch/powerpc/sysdev/mpc5xxx_clocks.c')
-rw-r--r--arch/powerpc/sysdev/mpc5xxx_clocks.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/mpc5xxx_clocks.c b/arch/powerpc/sysdev/mpc5xxx_clocks.c
new file mode 100644
index 00000000000..34e12f9995f
--- /dev/null
+++ b/arch/powerpc/sysdev/mpc5xxx_clocks.c
@@ -0,0 +1,33 @@
+/**
+ * mpc5xxx_get_bus_frequency - Find the bus frequency for a device
+ * @node: device node
+ *
+ * Returns bus frequency (IPS on MPC512x, IPB on MPC52xx),
+ * or 0 if the bus frequency cannot be found.
+ */
+
+#include <linux/kernel.h>
+#include <linux/of_platform.h>
+
+unsigned int
+mpc5xxx_get_bus_frequency(struct device_node *node)
+{
+ struct device_node *np;
+ const unsigned int *p_bus_freq = NULL;
+
+ of_node_get(node);
+ while (node) {
+ p_bus_freq = of_get_property(node, "bus-frequency", NULL);
+ if (p_bus_freq)
+ break;
+
+ np = of_get_parent(node);
+ of_node_put(node);
+ node = np;
+ }
+ if (node)
+ of_node_put(node);
+
+ return p_bus_freq ? *p_bus_freq : 0;
+}
+EXPORT_SYMBOL(mpc5xxx_get_bus_frequency);