Linux/PROCESSOR-SDK-AM437X: GPIO usage questions

Tool/software: Linux

Hello,

I am writing a device driver for out fingerprint sensor using the video port (header J3) on the AM4378-GP-EVM board. I need use a gpio for the sensor camera reset purpose.  The following is the device tree changes for both i2c0 and i2c1 nodes in am437x-gp-evm.dts: ( I don't change anything in GPIO in am4372.dts and any other .dts files)

ov2659@37 {
                compatible = "ovti,ov2659";
                reg = <0x37>;

                clocks = <&refclk 0>;
                clock-names = "xvclk";

                cisreset-gpios = <&gpio0 18 GPIO_ACTIVE_LOW>;

                port {
                        ov2659_0: endpoint {
                                remote-endpoint = <&vpfe1_ep>;
                                link-frequencies = /bits/ 64 <70000000>;
                        };
                };
        };

And in my device driver probe function I have:

gpio = devm_gpiod_get(&client->dev, "cisreset", GPIOD_OUT_HIGH);
        if (IS_ERR(gpio))
        {
                printk("Start probe: **** IB Sensor cisreset-gpios is NOT defind in device tree! ****\n");
                return PTR_ERR(gpio);
        }
        ov2659->cis_reset_gpio = gpio;

I always get the error message:

**** IB Sensor cisreset-gpios is NOT defind in device tree! ****

Please help! Thanks.

-Ken Li