Hi Neil,

On 15/01/2026 14:00, Neil Armstrong wrote:

quoted

The Radxa Zero2 has an FUSB302 controller on i2c3 at address 0x22 and
INT# wired to GPIOA-13.

+        interrupts = <13 IRQ_TYPE_LEVEL_LOW>;

OK it seems I did read too fast, this should be 74 !

S922X Datasheet (same as A311D for this)

Table 6-32 GPIO Interrupt Sources

---------------------------------------------
| Input Mux Location    |    Description |
---------------------------------------------
| [76:61]        |    gpioA[15:0] |
---------------------------------------------

So gpioA13 ==> 74

Indeed. Sorry for this.

quoted

+
+        vbus-supply = <&ao_5v>;
+
+        status = "okay";

And I get:

   DTC [C] arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dtb
arch/arm64/boot/dts/amlogic/meson-g12b-radxa-zero2.dtb: fusb302@22 
(fcs,fusb302): 'connector' is a required property
         from schema $id: http://devicetree.org/schemas/usb/ 
fcs,fusb302.yaml#

Please add a minimal connector, like:

+               connector {
+                       compatible = "usb-c-connector";
+                       label = "USB-C";
+                       data-role = "host";
+                       power-role = "source";
+                       source-pdos = <PDO_FIXED(5000, 2000, 
PDO_FIXED_USB_COMM)>;
+               };

I'll drop this change from my tree.

Again, my bad. My intention here was a "minimal" description, mostly to 
reserve 0x22 so end-users can run `i2cdetect` or such on the 40-pin 
exposed i2c3 and not be surprised. Guess I didn't run dtbs_check hard 
enough and missed the required connector.

And you may also add support for the superspeed mux to switch the USB3 
polarity.

I have a prototype at https://gitlab.com/superna9999/linux/-/tree/topic/ 
amlogic/radxa-zero2/fusb302?ref_type=heads

I'll try your prototype. I had no idea it actually had those capabilities.

Do you think it is worth to resend this with just the fixed 74 pin & the 
minimal connector as you suggested? Now that I've seen your work, a "add 
FUSB302" that does nothing (while being capable) feels frivolous and 
confusing.

Thanks,
Ricardo