From: Thor Thayer <ttha...@opensource.altera.com> Some SPI masters require the slave to be selected before a transaction can occur - even in the case of GPIO chip select.
This patch adds a GPIO slave select parameter to indicate the slave needs to be selected in the GPIO CS case. Signed-off-by: Thor Thayer <ttha...@opensource.altera.com> --- v2 Add to SPI framework - add bindings. --- Documentation/devicetree/bindings/spi/spi-bus.txt | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/spi/spi-bus.txt b/Documentation/devicetree/bindings/spi/spi-bus.txt index 4b1d6e7..3a006bc 100644 --- a/Documentation/devicetree/bindings/spi/spi-bus.txt +++ b/Documentation/devicetree/bindings/spi/spi-bus.txt @@ -24,6 +24,7 @@ support describing the chip select layout. Optional properties: - cs-gpios - gpios chip select. - num-cs - total number of chipselects. +- gpio-ss - use internal slave select with gpio chip select. If cs-gpios is used the number of chip selects will be increased automatically with max(cs-gpios > hw cs). -- 1.7.9.5
