[PATCHv2 1/2] Documentation: dt: spi: Add GPIO Slave Select Parameter

[<tthayer@xxxxxxxxxxxxxxxxxxxxx>]

From: Thor Thayer <tthayer@xxxxxxxxxxxxxxxxxxxxx>

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 <tthayer@xxxxxxxxxxxxxxxxxxxxx>
---
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

--
To unsubscribe from this list: send the line "unsubscribe linux-spi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html