Document Cadence GPIO bindings.
Signed-off-by: Boris Brezillon <boris.brezil...@free-electrons.com>
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.../devicetree/bindings/gpio/cdns,gpio.txt | 41 ++++++++++++++++++++++
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b/Documentation/devicetree/bindings/gpio/cdns,gpio.txt
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+Cadence GPIO controller bindings
+
+Required properties:
+- compatible: should be "cdns,gpio-r1p02".
+- reg: the register base address and size.
+- #gpio-cells: should be 2.
+ * first cell is the GPIO number.
+ * second cell specifies the GPIO flags, as defined in
+ <dt-bindings/gpio/gpio.h>. Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW
+ flags are supported.
+- gpio-controller: marks the device as a GPIO controller.
+- clocks: should contain one entry referencing the peripheral clock driving the
+ GPIO controller.
+
+Optional properties:
+- interrupt-parent: phandle of the parent interrupt controller.
+- interrupts: interrupt specifier for the controllers interrupt.
+- interrupt-controller: marks the device as an interrupt controller. When
+ defined, interrupts, interrupt-parent and #interrupt-cells are required.
+- interrupt-cells: should be 2.
+ * first cell is the GPIO number you want to use as an IRQ source.
+ * second cell specifies the IRQ type, as defined in
+ <dt-bindings/interrupt-controller/irq.h>.
+
+Example:
+
+ gpio-controller@d050000 {
+ compatible = "cdns,gpio";
+ reg = <0xd050000 0x10000>;
+
+ clocks = <&gpio_pclk>;
+
+ interrupt-parent = <&intc>;
+ interrupts = <4 IRQ_TYPE_LEVEL_HIGH>;
+
+ gpio-controller;
+ #gpio-cells = <2>;
+
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ };
--
2.7.4
