tegrakernel/kernel/kernel-4.9/Documentation/devicetree/bindings/gpio/gpio-pca9570.txt

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* NXP PCA953x I2C GPIO multiplexer
Required properties:
- compatible: Has to contain one of the following:
nxp,pca9570
- #gpio-cells : Should be two. The first cell is the pin number and the
second cell is used to specify optional parameters (currently unused).
- gpio-controller : Marks the device node as a GPIO controller.
Example:
i2c@7000d000 {
gpio@48 {
compatible = "nxp,9570";
reg = <0x48>;
#gpio-cells = <2>;
gpio-controller;
};
};