Segher Boessenkool wrote:

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+               i2c-video {
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+                       compatible = "virtual,i2c-gpio";

There isn't a documented binding for this.  Is there a driver for it?

I have a driver for it. But it isn't yet published.

I bet there already is a generic IIC-via-GPIOs driver that
you could use.

Yes, there is a platform driver for that.
I picked that, extracted the common code into a common file, converted the existing driver to use the common code, then created a new one for platform bindings using the common code again.

(Then added gpio_direction_is_output() to gpiolib and sda_enforce_dir() to i2c-gpio).

Thanks,
Albert