aboutsummaryrefslogtreecommitdiffstats
path: root/include/linux/spi/spi_bitbang.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/linux/spi/spi_bitbang.h')
-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 bf8de281b4ed..eed4254bd503 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);
83 * int getmiso(struct spi_device *); 83 * int getmiso(struct spi_device *);
84 * void spidelay(unsigned); 84 * void spidelay(unsigned);
85 * 85 *
86 * setsck()'s is_on parameter is a zero/nonzero boolean.
87 *
88 * setmosi()'s is_on parameter is a zero/nonzero boolean.
89 *
90 * getmiso() is required to return 0 or 1 only. Any other value is invalid
91 * and will result in improper operation.
92 *
86 * A non-inlined routine would call bitbang_txrx_*() routines. The 93 * A non-inlined routine would call bitbang_txrx_*() routines. The
87 * main loop could easily compile down to a handful of instructions, 94 * main loop could easily compile down to a handful of instructions,
88 * especially if the delay is a NOP (to run at peak speed). 95 * especially if the delay is a NOP (to run at peak speed).