Add a devicetree binding documentation for the max732x driver.
Signed-off-by: Semen Protsenko <semen.protsenko@xxxxxxxxxxxxxxx>
---
.../devicetree/bindings/gpio/gpio-max732x.txt | 59 ++++++++++++++++++++
1 file changed, 59 insertions(+)
create mode 100644 Documentation/devicetree/bindings/gpio/gpio-max732x.txt
diff --git a/Documentation/devicetree/bindings/gpio/gpio-max732x.txt b/Documentation/devicetree/bindings/gpio/gpio-max732x.txt
new file mode 100644
index 0000000..5fdc843
--- /dev/null
+++ b/Documentation/devicetree/bindings/gpio/gpio-max732x.txt
@@ -0,0 +1,59 @@
+* MAX732x-compatible I/O expanders
+
+Required properties:
+ - compatible: Should be one of the following:
+ - "maxim,max7319": For the Maxim MAX7319
+ - "maxim,max7320": For the Maxim MAX7320
+ - "maxim,max7321": For the Maxim MAX7321
+ - "maxim,max7322": For the Maxim MAX7322
+ - "maxim,max7323": For the Maxim MAX7323
+ - "maxim,max7324": For the Maxim MAX7324
+ - "maxim,max7325": For the Maxim MAX7325
+ - "maxim,max7326": For the Maxim MAX7326
+ - "maxim,max7327": For the Maxim MAX7327
+ - reg: I2C slave address for this device.
+ - gpio-controller: Marks the device node as a GPIO controller.
+ - #gpio-cells: Should be 2.
+ - first cell is the GPIO number
+ - second cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>.
+ Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
+
+Optional properties:
+
+ The I/O expander can detect input state changes, and thus optionally act as
+ an interrupt controller. When the expander interrupt line is connected all the
+ following properties must be set. For more information please see the
+ interrupt controller device tree bindings documentation available at
+ Documentation/devicetree/bindings/interrupt-controller/interrupts.txt.
+
+ - interrupt-controller: Identifies the node as an interrupt controller.
+ - #interrupt-cells: Number of cells to encode an interrupt source, shall be 2.
+ - first cell is the pin number
+ - second cell is used to specify flags
+ - interrupt-parent: phandle of the parent interrupt controller.
+ - interrupts: Interrupt specifier for the controllers interrupt.
+
+Please refer to gpio.txt in this directory for details of the common GPIO
+bindings used by client devices.
+
+Example 1. MAX7325 with interrupt support enabled (CONFIG_GPIO_MAX732X_IRQ=y):
+
+ expander: max7325@6d {
+ compatible = "maxim,max7325";
+ reg = <0x6d>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ interrupt-parent = <&gpio4>;
+ interrupts = <29 IRQ_TYPE_EDGE_FALLING>;
+ };
+
+Example 2. MAX7325 with interrupt support disabled (CONFIG_GPIO_MAX732X_IRQ=n):
+
+ expander: max7325@6d {
+ compatible = "maxim,max7325";
+ reg = <0x6d>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
--
1.7.9.5
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