[POWERPC] Define of_read_ulong helper

There are various places where we want to extract an unsigned long
value from a device-tree property that can be 1 or 2 cells in length.
This replaces some open-coded calculations, and one place where we
assumed without checking that properties were the length we wanted,
with a little of_read_ulong() helper.

Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c
index b9a2061cfdb7..7a3c3f791ade 100644
--- a/arch/powerpc/kernel/time.c
+++ b/arch/powerpc/kernel/time.c
@@ -870,9 +870,7 @@ static int __init get_freq(char *name, int cells, unsigned long *val)
                 fp = get_property(cpu, name, NULL);
                 if (fp) {
                         found = 1;
-                        *val = 0;
-                        while (cells--)
-                                *val = (*val << 32) | *fp++;
+                        *val = of_read_ulong(fp, cells);
                 }
 
                 of_node_put(cpu);