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(Gathering the answer based on comments I have given earlier)

For sake of the clarification I have to say, that from your DSDT we can get the following information. There are 3 groups of PMICs, i.e. DSCx, CLPx and PMIx. I believe they are based on the model, like Desktop, Laptop, 2-in-1. And in each case all PMICs in the same group have different _UID. From the provided output of the grep -H 15 ... we have only 2 out of 10 enumerated with the instances INT3472:08 and INT3472:09 (exactly two last defined in DSDT). And they are PMIx, you may check this by grep -H . /sys/bus/acpi/devices/INT3472:*/path.

Your interest is the PMI1 which consumes three GPIO lines from Intel GPIO driver, i.e. pins 121, 122 and 143 (you may decode them as Community #2, Group #5 or GPP_F, relative to the group pins 1, 2 and 23, this may help you to understand _INI method that touches these lines via other methods in DSDT), and provides 3 + 7 = 10 pins according to its driver.

Now to the code. The _DEP ACPI method is used solely for linking power resources, and Linux kernel has other means how to hijack resources from other device, because what you are trying to do is to use the resource which is not related to the device you are creating driver for.

The method is to find device by ACPI HID: