### Author:  [@doudootiana](https://community.solid-run.com/u/doudootiana)
#### Post date: [April 2, 2023, 2:14pm UTC](https://community.solid-run.com/t/clearfog-pro-user-button/615/1 "2023-04-02T14:14:41Z")
Hy.
I try to use the button by GPIO.
I don’t manage to find which gpio i must use
```auto
keys {
compatible = "gpio-keys";
pinctrl-0 = <&cp0_button_pin>;
pinctrl-names = "default";
button0{
/* SW3 button */
label = "SW3";
gpios = <&cp0_gpio2 0 GPIO_ACTIVE_LOW>;
linux,can-disable;
linux,code = ;
};
};
};
```
and
```auto
cp0_button_pin: cp0-button-pin {
marvell,pins = "mpp32";
marvell,function = "gpio";
};
```
```auto
# ls /sys/class/gpio/
export gpio42 gpiochip32 gpiochip64
gpio32 gpiochip0 gpiochip512 unexport
# ^C
#
```
```auto
# gpiodetect
gpiochip0 [0-0020] (16 lines)
gpiochip1 [f06f4000.system-controller:gpio] (20 lines)
gpiochip2 [f2440000.system-controller:gpio] (32 lines)
gpiochip3 [f2440000.system-controller:gpio] (31 lines)
# ^C
# gpioinfo gpiochip0
gpiochip0 - 16 lines:
line 0: unnamed "pcie1.0-clkreq" input active-low [used]
line 1: unnamed unused output active-high
line 2: unnamed unused output active-high
line 3: unnamed "pcie1.0-w-disable" output active-low [used]
line 4: unnamed "pcie2.0-clkreq" input active-low [used]
line 5: unnamed "usb3-current-limit" input active-low [used]
line 6: unnamed "usb3-power" output active-high [used]
line 7: unnamed "pcie2.0-w-disable" output active-low [used]
line 8: unnamed unused input active-high
line 9: unnamed unused input active-high
line 10: unnamed unused input active-high
line 11: unnamed "m.2 devslp" output active-high [used]
line 12: unnamed "los" input active-high [used]
line 13: unnamed "tx-fault" input active-high [used]
line 14: unnamed "tx-disable" input active-high [used]
line 15: unnamed "mod-def0" input active-low [used]
# gpioinfo gpiochip1
gpiochip1 - 20 lines:
line 0: unnamed unused input active-high
line 1: unnamed unused input active-high
line 2: unnamed unused input active-high
line 3: unnamed unused input active-high
line 4: unnamed unused input active-high
line 5: unnamed unused input active-high
line 6: unnamed unused input active-high
line 7: unnamed unused input active-high
line 8: unnamed unused input active-high
line 9: unnamed unused input active-high
line 10: unnamed unused input active-high
line 11: unnamed unused input active-high
line 12: unnamed unused input active-high
line 13: unnamed unused input active-high
line 14: unnamed unused input active-high
line 15: unnamed unused input active-high
line 16: unnamed unused input active-high
line 17: unnamed unused input active-high
line 18: unnamed unused input active-high
line 19: unnamed unused input active-high
# gpioinfo gpiochip2
gpiochip2 - 32 lines:
line 0: unnamed "sysfs" input active-high [used]
line 1: unnamed unused input active-high
line 2: unnamed unused input active-high
line 3: unnamed unused input active-high
line 4: unnamed unused input active-high
line 5: unnamed unused input active-high
line 6: unnamed unused input active-high
line 7: unnamed unused input active-high
line 8: unnamed unused input active-high
line 9: unnamed unused input active-high
line 10: unnamed "sysfs" input active-high [used]
line 11: unnamed unused input active-high
line 12: unnamed unused input active-high
line 13: unnamed unused input active-high
line 14: unnamed unused input active-high
line 15: unnamed unused input active-high
line 16: unnamed unused input active-high
line 17: unnamed unused input active-high
line 18: unnamed unused input active-high
line 19: unnamed unused input active-high
line 20: unnamed unused input active-high
line 21: unnamed unused input active-high
line 22: unnamed unused input active-high
line 23: unnamed unused input active-high
line 24: unnamed unused input active-high
line 25: unnamed unused input active-high
line 26: unnamed unused output active-high
line 27: unnamed "phy_reset" output active-high [used]
line 28: unnamed unused input active-high
line 29: unnamed unused input active-high
line 30: unnamed unused input active-high
line 31: unnamed unused input active-high
# gpioinfo gpiochip3
gpiochip3 - 31 lines:
line 0: unnamed unused input active-high
line 1: unnamed unused input active-high
line 2: unnamed unused input active-high
line 3: unnamed unused input active-high
line 4: unnamed unused input active-high
line 5: unnamed unused input active-high
line 6: unnamed unused input active-high
line 7: unnamed unused output active-high
line 8: unnamed unused input active-high
line 9: unnamed unused input active-high
line 10: unnamed unused input active-high
line 11: unnamed "cd" input active-low [used]
line 12: unnamed unused input active-high
line 13: unnamed unused input active-high
line 14: unnamed unused input active-high
line 15: unnamed unused input active-high
line 16: unnamed unused input active-high
line 17: unnamed unused input active-high
line 18: unnamed unused input active-high
line 19: unnamed unused input active-high
line 20: unnamed unused input active-high
line 21: unnamed unused input active-high
line 22: unnamed unused output active-high
line 23: unnamed unused input active-high
line 24: unnamed unused input active-high
line 25: unnamed unused input active-high
line 26: unnamed unused output active-high
line 27: unnamed unused input active-high
line 28: unnamed unused output active-high
line 29: unnamed unused output active-high
line 30: unnamed unused output active-high
```
Thank by advance
---
### Author:  [@jnettlet](https://community.solid-run.com/u/jnettlet)
#### Post date: [April 3, 2023, 6:18am UTC](https://community.solid-run.com/t/clearfog-pro-user-button/615/2 "2023-04-03T06:18:40Z")
I assume you mean the push button in between the switch ports and the SFP+ cage. That switch is routed to an assembly option for the PIC microcontroller that is not assembled by default. You can refer to the images here, [https://solidrun.atlassian.net/wiki/spaces/developer/pages/268140545/ClearFog+CN9130+Pro+Quick+Start+Guide#Documentation](https://solidrun.atlassian.net/wiki/spaces/developer/pages/268140545/ClearFog+CN9130+Pro+Quick+Start+Guide#Documentation)
---
### Author:  [@doudootiana](https://community.solid-run.com/u/doudootiana)
#### Post date: [April 3, 2023, 11:26am UTC](https://community.solid-run.com/t/clearfog-pro-user-button/615/3 "2023-04-03T11:26:00Z")
Hy.
Thank you to answer me 🙂
It’s this button.
So if i understand, without thé option for thé pic, i cannot use this button.
---
### Author:  [@jnettlet](https://community.solid-run.com/u/jnettlet)
#### Post date: [April 3, 2023, 11:29am UTC](https://community.solid-run.com/t/clearfog-pro-user-button/615/4 "2023-04-03T11:29:53Z")
With the board as shipped that is correct. The microcontroller is an assembly option and not the default. If you don’t mind soldering, then you could solder the pad for that button over to a GPIO on the MikroBus header. I can send you a picture if you would like
---
### Author:  [@doudootiana](https://community.solid-run.com/u/doudootiana)
#### Post date: [April 3, 2023, 11:50am UTC](https://community.solid-run.com/t/clearfog-pro-user-button/615/5 "2023-04-03T11:50:26Z")
I want to, thank you.
An off-topic question and I hope not too stupid ^^.
I chosen the pro at the base just for the two mpcie.
But is it possible to add an mpcie to a clearfog base?
---
### Author:  [@jnettlet](https://community.solid-run.com/u/jnettlet)
#### Post date: [April 3, 2023, 11:55am UTC](https://community.solid-run.com/t/clearfog-pro-user-button/615/6 "2023-04-03T11:55:11Z")
The base only has the single mPCIe and then the mSATA connector.
---
### Author:  [@jnettlet](https://community.solid-run.com/u/jnettlet)
#### Post date: [April 3, 2023, 12:11pm UTC](https://community.solid-run.com/t/clearfog-pro-user-button/615/7 "2023-04-03T12:11:40Z")
Actually I was just poking around the board a bit more regarding that pin and it is connected to the main SOC is the PIC is not populated. It is on pin mpp34. That is not expressed in the device-tree currently. I will work out patches for u-boot and linux.