1 files changed, 16 insertions, 5 deletions

diff --git a/arch/powerpc/platforms/powermac/feature.c b/arch/powerpc/platforms/powermac/feature.c
index 0d7fa00fcb00..f6e22da2a5da 100644
--- a/arch/powerpc/platforms/powermac/feature.c
+++ b/arch/powerpc/platforms/powermac/feature.c
@@ -1650,11 +1650,19 @@ void pmac_tweak_clock_spreading(int enable)
          */
 
         if (macio->type == macio_intrepid) {
-                if (enable)
-                        UN_OUT(UNI_N_CLOCK_SPREADING, 2);
-                else
-                        UN_OUT(UNI_N_CLOCK_SPREADING, 0);
-                mdelay(40);
+                struct device_node *clock =
+                        of_find_node_by_path("/uni-n@f8000000/hw-clock");
+                if (clock && get_property(clock, "platform-do-clockspreading",
+                                          NULL)) {
+                        printk(KERN_INFO "%sabling clock spreading on Intrepid"
+                               " ASIC\n", enable ? "En" : "Dis");
+                        if (enable)
+                                UN_OUT(UNI_N_CLOCK_SPREADING, 2);
+                        else
+                                UN_OUT(UNI_N_CLOCK_SPREADING, 0);
+                        mdelay(40);
+                }
+                of_node_put(clock);
         }
 
         while (machine_is_compatible("PowerBook5,2") ||
@@ -1724,6 +1732,9 @@ void pmac_tweak_clock_spreading(int enable)
                         pmac_low_i2c_close(ui2c);
                         break;
                 }
+                printk(KERN_INFO "%sabling clock spreading on i2c clock chip\n",
+                       enable ? "En" : "Dis");
+
                 pmac_low_i2c_setmode(ui2c, pmac_low_i2c_mode_stdsub);
                 rc = pmac_low_i2c_xfer(ui2c, 0xd2 | pmac_low_i2c_write, 0x80, buffer, 9);
                 DBG("write result: %d,", rc);