Does Edge2 IO Board Have Internal Pullup?

Edge2 Android
1

Which system do you use? Android, Ubuntu, OOWOW or others?

Android

Which version of system do you use? Please provide the version of the system here:

13

Please describe your issue below:

When I setup GPIO using

echo 24 > /sys/class/gpio/export
echo in > /sys/class/gpio/gpio24/direction

Are there any internal pullups here? When i read the floating GPIO, I always read “1”. Pulling this pin to GND outputs “0”.

# Floating pin
cat /sys/class/gpio/gpio24/value # -> 1

# Tied to GND
cat /sys/class/gpio/gpio24/value # -> 0

I ask this in case I should put my own pullups on these pins.
Thanks

2

Hello @ii_ltd

You can check the Edge2-IO schematic here: https://dl.khadas.com/products/add-ons/edge2-io/schematic/edge2-io_sch_v12_221216.pdf

@william.lin please help to check.

4

Hello, you need to set i2C6 to disabled status to use this gpio

xiong@builder:~/work/edge2-14/kernel-6.1$ git diff
diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts b/arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts
index e387433f788d..3ca3e23deff8 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-khadas-edge2.dts
@@ -444,7 +444,7 @@ &i2c5 {
 };
 
 &i2c6 {
-       status = "okay";
+       status = "disabled";
        pinctrl-names = "default";
        pinctrl-0 = <&i2c6m0_xfer>;

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5

OK, I can see there is pullup, thank you