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-rw-r--r--Documentation/powerpc/dts-bindings/fsl/spi.txt7
1 files changed, 7 insertions, 0 deletions
diff --git a/Documentation/powerpc/dts-bindings/fsl/spi.txt b/Documentation/powerpc/dts-bindings/fsl/spi.txt
index e7d9a34..80510c0 100644
--- a/Documentation/powerpc/dts-bindings/fsl/spi.txt
+++ b/Documentation/powerpc/dts-bindings/fsl/spi.txt
@@ -13,6 +13,11 @@ Required properties:
- interrupt-parent : the phandle for the interrupt controller that
services interrupts for this device.
+Optional properties:
+- gpios : specifies the gpio pins to be used for chipselects.
+ The gpios will be referred to as reg = <index> in the SPI child nodes.
+ If unspecified, a single SPI device without a chip select can be used.
+
Example:
spi@4c0 {
cell-index = <0>;
@@ -21,4 +26,6 @@ Example:
interrupts = <82 0>;
interrupt-parent = <700>;
mode = "cpu";
+ gpios = <&gpio 18 1 // device reg=<0>
+ &gpio 19 1>; // device reg=<1>
};