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authorDavid S. Miller <davem@davemloft.net>2009-02-24 03:50:29 -0800
committerDavid S. Miller <davem@davemloft.net>2009-02-24 03:50:29 -0800
commite70049b9e74267dd47e1ffa62302073487afcb48 (patch)
tree2cd000c0751ef31c9044b020d63f278cdf4f332d /include/linux/spi
parentd18921a0e319ab512f8186b1b1142c7b8634c779 (diff)
parentf7e603ad8f78cd3b59e33fa72707da0cbabdf699 (diff)
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Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
Diffstat (limited to 'include/linux/spi')
-rw-r--r--include/linux/spi/spi_bitbang.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/spi/spi_bitbang.h b/include/linux/spi/spi_bitbang.h
index bf8de281b4e..eed4254bd50 100644
--- a/include/linux/spi/spi_bitbang.h
+++ b/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).