linux/Documentation/devicetree/bindings/gpio/gpio-msm.txt
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   1MSM GPIO controller bindings
   2
   3Required properties:
   4- compatible:
   5  - "qcom,msm-gpio" for MSM controllers
   6- #gpio-cells : Should be two.
   7  - first cell is the pin number
   8  - second cell is used to specify optional parameters (unused)
   9- gpio-controller : Marks the device node as a GPIO controller.
  10- #interrupt-cells : Should be 2.
  11- interrupt-controller: Mark the device node as an interrupt controller
  12- interrupts : Specify the TLMM summary interrupt number
  13- ngpio : Specify the number of MSM GPIOs
  14
  15Example:
  16
  17        msmgpio: gpio@fd510000 {
  18                compatible = "qcom,msm-gpio";
  19                gpio-controller;
  20                #gpio-cells = <2>;
  21                interrupt-controller;
  22                #interrupt-cells = <2>;
  23                reg = <0xfd510000 0x4000>;
  24                interrupts = <0 208 0>;
  25                ngpio = <150>;
  26        };
  27