[lkml]   [2014]   [Jan]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH v2 3/5] spi: Correct set_cs() documentation
From: Geert Uytterhoeven <>

The documentation for spi_master.set_cs() says:

assert or deassert chip select, true to assert

i.e. its "enable" parameter uses assertion-level logic.

This does not match the implementation of spi_set_cs(), which calls
spi_master.set_cs() with the wanted logic level of the chip select line,
which depends on the polarity of the chip select signal.

Correct the documentation to match the implementation.

Signed-off-by: Geert Uytterhoeven <>
v2: Changed documentation instead of implementation

include/linux/spi/spi.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index ba69940a6515..a1d4ca290862 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -277,7 +277,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* @unprepare_transfer_hardware: there are currently no more messages on the
* queue so the subsystem notifies the driver that it may relax the
* hardware by issuing this call
- * @set_cs: assert or deassert chip select, true to assert. May be called
+ * @set_cs: set the logic level of the chip select line. May be called
* from interrupt context.
* @prepare_message: set up the controller to transfer a single message,
* for example doing DMA mapping. Called from threaded

 \ /
  Last update: 2014-01-21 17:01    [W:0.135 / U:0.284 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site