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-rw-r--r--Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
index f61cef74a212..941a26aa4322 100644
--- a/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
+++ b/Documentation/devicetree/bindings/gpio/renesas,gpio-rcar.txt
@@ -21,6 +21,12 @@ Required Properties:
GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
- gpio-ranges: Range of pins managed by the GPIO controller.
+Optional properties:
+
+ - clocks: Must contain a reference to the functional clock. The property is
+ mandatory if the hardware implements a controllable functional clock for
+ the GPIO instance.
+
Please refer to gpio.txt in this directory for details of gpio-ranges property
and the common GPIO bindings used by client devices.