platform_get_resource fails

REALLY NEED SOME HELP:

1. We put our IP on the FPGA-HPS bridge that the leds are on.

2. Got/generated all the files via instructions - .rbf, .dtb (and I wasn't sure so did do the preloader-mkpimage.bin)

I did have to generate a new device tree

2b. I had to update the zImage because the version magic numbers did not match -- when I did this the led-gpio driver gives the message:

platform leds.1: Driver leds-gpio request probe deferral -- why?

3. I DID NOT add the driver to the kernel but just cross compiled it and put it on the sd card to manually insert.

When I insert the device driver - I get an error with the: of_address_to_resource

static int touchscreen_drv_probe( struct platform_dev *op)

{

int rc = 0;

struct device_node *node = op->dev.of_node;

struct resource res;

// the of_match_device works ---

rc = (of_address_to_resource( &op->dev.of_node, 0, &res);

if (rc)

{

//fail

}

}

Where could the disconnect be?