diff --git a/[refs] b/[refs]
index a0d642227f0e..ce1ab21600b9 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f6fcba7014f9cc535fa75ef98c008b24e49e2212
+refs/heads/master: 01b24fee285b098c74318a8be801ef3711ec18d7
diff --git a/trunk/include/linux/spi/spi_bitbang.h b/trunk/include/linux/spi/spi_bitbang.h
index bf8de281b4ed..eed4254bd503 100644
--- a/trunk/include/linux/spi/spi_bitbang.h
+++ b/trunk/include/linux/spi/spi_bitbang.h
@@ -83,6 +83,13 @@ extern int spi_bitbang_stop(struct spi_bitbang *spi);
  *  int getmiso(struct spi_device *);
  *  void spidelay(unsigned);
  *
+ * setsck()'s is_on parameter is a zero/nonzero boolean.
+ *
+ * setmosi()'s is_on parameter is a zero/nonzero boolean.
+ *
+ * getmiso() is required to return 0 or 1 only. Any other value is invalid
+ * and will result in improper operation.
+ *
  * A non-inlined routine would call bitbang_txrx_*() routines.  The
  * main loop could easily compile down to a handful of instructions,
  * especially if the delay is a NOP (to run at peak speed).