Update document devicetree bindings to support "cs-gpios" property.

Signed-off-by: Jeffy Chen <jeffy.c...@rock-chips.com>
---

Changes in v2: None

 Documentation/devicetree/bindings/spi/spi-rockchip.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/spi/spi-rockchip.txt 
b/Documentation/devicetree/bindings/spi/spi-rockchip.txt
index 83da493..d0be2e6 100644
--- a/Documentation/devicetree/bindings/spi/spi-rockchip.txt
+++ b/Documentation/devicetree/bindings/spi/spi-rockchip.txt
@@ -25,6 +25,7 @@ Required Properties:
 
 Optional Properties:
 
+- cs-gpios : Specifies the gpio pins to be used for chipselects.
 - dmas: DMA specifiers for tx and rx dma. See the DMA client binding,
                Documentation/devicetree/bindings/dma/dma.txt
 - dma-names: DMA request names should include "tx" and "rx" if present.
@@ -48,6 +49,7 @@ Example:
                #address-cells = <1>;
                #size-cells = <0>;
                interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
+               cs-gpios = <&gpio2 23 GPIO_ACTIVE_HIGH>;
                clocks = <&cru SCLK_SPI0>, <&cru PCLK_SPI0>;
                clock-names = "spiclk", "apb_pclk";
                pinctrl-0 = <&spi1_pins>;
-- 
2.1.4


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