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| author |   Andi Shyti <andi.shyti@samsung.com> | 2016-06-28 11:41:12 +0900 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2016-06-29 22:45:23 +0100 |
| commit | a92e7c3d82a1313ab1954e5cdfd8f04efdb4ca78 (patch) | |
| tree | ef099f7f2fdb25db02300b670414a5d94a29e91b /Documentation/devicetree/bindings/spi | |
| parent | spi: s3c64xx: group the CS signalling writes in a single function (diff) | |
| download | linux-dev-a92e7c3d82a1313ab1954e5cdfd8f04efdb4ca78.tar.xz linux-dev-a92e7c3d82a1313ab1954e5cdfd8f04efdb4ca78.zip | |
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')
| -rw-r--r-- | Documentation/devicetree/bindings/spi/spi-samsung.txt | 3 |
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 |