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authorAndrew Jeffery <andrew@aj.id.au>2016-08-30 17:24:23 +0930
committerLinus Walleij <linus.walleij@linaro.org>2016-09-07 16:41:45 +0200
commit19de85134ee92d927044cc620961a322bfde9119 (patch)
treecf9a767b5d15fe65a0481005e5e38ac99d62a54c
parentbf62efeb164343916ebb89dca6dfe5e6b6751700 (diff)
gpio: dt-bindings: Add documentation for Aspeed GPIO controllers
Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Acked-by: Joel Stanley <joel@jms.id.au> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
-rw-r--r--Documentation/devicetree/bindings/gpio/gpio-aspeed.txt36
1 files changed, 36 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt b/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt
new file mode 100644
index 000000000000..393bb2ed8a77
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-aspeed.txt
@@ -0,0 +1,36 @@
+Aspeed GPIO controller Device Tree Bindings
+-------------------------------------------
+
+Required properties:
+- compatible : Either "aspeed,ast2400-gpio" or "aspeed,ast2500-gpio"
+
+- #gpio-cells : Should be two
+ - First cell is the GPIO line number
+ - Second cell is used to specify optional
+ parameters (unused)
+
+- reg : Address and length of the register set for the device
+- gpio-controller : Marks the device node as a GPIO controller.
+- interrupts : Interrupt specifier (see interrupt bindings for
+ details)
+- interrupt-controller : Mark the GPIO controller as an interrupt-controller
+
+Optional properties:
+
+- interrupt-parent : The parent interrupt controller, optional if inherited
+
+The gpio and interrupt properties are further described in their respective
+bindings documentation:
+
+- Documentation/devicetree/bindings/gpio/gpio.txt
+- Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
+
+ Example:
+ gpio@1e780000 {
+ #gpio-cells = <2>;
+ compatible = "aspeed,ast2400-gpio";
+ gpio-controller;
+ interrupts = <20>;
+ reg = <0x1e780000 0x1000>;
+ interrupt-controller;
+ };