summaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/spi/spi-samsung.txt
diff options
context:
space:
mode:
authorAndi Shyti <andi.shyti@samsung.com>2016-06-28 11:41:12 +0900
committerMark Brown <broonie@kernel.org>2016-06-29 22:45:23 +0100
commita92e7c3d82a1313ab1954e5cdfd8f04efdb4ca78 (patch)
treeef099f7f2fdb25db02300b670414a5d94a29e91b /Documentation/devicetree/bindings/spi/spi-samsung.txt
parentaa4964c4eb3ed38666023bcb805403cb7cf2af63 (diff)
spi: s3c64xx: consider the case when the CS line is not connected
When the CS line is not connected, it is not needed to enable or disable the chip selection functionality from the s3c64xx devices in order to perform a transfer. Set the CS controller logically always enabled already during initialization (by writing '0' in the S3C64XX_SPI_SLAVE_SEL register) and never disable it. Signed-off-by: Andi Shyti <andi.shyti@samsung.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/spi/spi-samsung.txt')
-rw-r--r--Documentation/devicetree/bindings/spi/spi-samsung.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/spi/spi-samsung.txt b/Documentation/devicetree/bindings/spi/spi-samsung.txt
index 6dbdeb3c361a..930bc7349271 100644
--- a/Documentation/devicetree/bindings/spi/spi-samsung.txt
+++ b/Documentation/devicetree/bindings/spi/spi-samsung.txt
@@ -40,6 +40,9 @@ Optional Board Specific Properties:
- cs-gpios: should specify GPIOs used for chipselects (see spi-bus.txt)
+- no-cs-readback: the CS line is disconnected, therefore the device should not
+ operate based on CS signalling.
+
SPI Controller specific data in SPI slave nodes:
- The spi slave nodes should provide the following information which is required