STM32MP257FAL3 Can't access gpio 116

[jhkim]

I am trying to control the LTDC on the STM32MP257FAL based on the STM32MP257F-DK board, but I am unable to configure pin PH4. This pin is used as LED1 on the STM32MP257F-DK board, which is the LED near the button. However, I cannot find where this pin is configured in the kernel, OP-TEE, TF-A, or U-Boot.

Below is the relevant log message:
[ OK ] Reached target Local File Systems.
Starting Automatic Boot Loader Update...
Starting Create Volatile Files and Directories...
[ OK ] Finished Coldplug All udev Devices.
[ OK ] Finished Load/Save OS Random Seed.
[ OK ] Finished Automatic Boot Loader Update.
Starting Wait for udev To Complete Device Initialization...
[ OK ] Finished Create Volatile Files and Directories.
[ 6.950932] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 6.995536] Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 6.996629] Loaded X.509 cert 'wens: 61c038651aabdcf94bd0ac7ff06c7248db18c600'
[ OK ] Started Network Configuration.
Starting Network Name Resolution...
Starting Network Time Synchronization...
Starting Record System Boot/Shutdown in UTMP...
[ OK ] Finished Record System Boot/Shutdown in UTMP.
[ 7.982761] stm32-crc32 404c0000.crc: Initialized
[ 7.984493] stm32-adc-core 404f0000.adc: supply vdda not found, using dummy regulator
[ 7.993122] stm32mp257-pinctrl soc@0:pinctrl@44240000: Can't access gpio 116
[ 7.996877] stm32mp257-pinctrl soc@0:pinctrl@44240000: request() failed for pin 116
[ 8.017022] stm32mp257-pinctrl soc@0:pinctrl@44240000: pin-116 (48010000.display-controller) status -13
[ 8.021675] stm32mp257-pinctrl soc@0:pinctrl@44240000: could not request pin 116 (PH4) from group PH4 on device soc@0:pinctrl@44240000
[ 8.029469] stm32-adc-core 404f0000.adc: supply vref not found, using dummy regulator
[ 8.033312] stm32-display 48010000.display-controller: Error applying setting, reverse things back
[ 8.052773] stm32mp257-pinctrl soc@0:pinctrl@44240000: Can't access gpio 116
[ 8.060289] stm32mp257-pinctrl soc@0:pinctrl@44240000: request() failed for pin 116
[ 8.065100] stm32mp257-pinctrl soc@0:pinctrl@44240000: pin-116 (48010000.display-controller) status -13
[ 8.074556] stm32mp257-pinctrl soc@0:pinctrl@44240000: could not request pin 116 (PH4) from group PH4 on device soc@0:pinctrl@44240000
[ 8.086912] stm32-display 48010000.display-controller: Error applying setting, reverse things back
[ OK ] Started
[ 8.100540] mc: Linux media interface: v0.10
[ 8.104861] stm32-cryp 42030000.crypto: will run requests pump with realtime priority
Network Time Synchronization.
[ OK ] Started Network Name Resolution.
[ 8.129508] stm32-adc-core 404f0000.adc: vdda get voltage failed, -22
[ 8.135569] galcore: loading out-of-tree module taints kernel.
[ OK ] Reached target Network.
[ 8.149377] stm32-adc-core: probe of 404f0000.adc failed with error -22
[ 8.155689] stm32-cryp 42030000.crypto: Initialized
[ 8.159156] videodev: Linux video capture interface: v2.00
[ OK ] Reached target Host and Network Name Lookups.
[ 8.181429] stm32mp257-pinctrl soc@0:pinctrl@44240000: Can't access gpio 116
[ 8.182906] stm32mp257-pinctrl soc@0:pinctrl@44240000: request() failed for pin 116
[ 8.191183] stm32mp257-pinctrl soc@0:pinctrl@44240000: pin-116 (48010000.display-controller) status -13
[ 8.200291] stm32mp257-pinctrl soc@0:pinctrl@44240000: could not request pin 116 (PH4) from group PH4 on device soc@0:pinctrl@44240000
[ 8.214373] stm32-display 48010000.display-controller: Error applying setting, reverse things back
[ 8.225354] Galcore version 6.4.19.4.952875
[ OK ] Reached target System Time Set.
[ 8.260436] stm32mp257-pinctrl soc@0:pinctrl@44240000: Can't access gpio 116
[ 8.265402] stm32mp257-pinctrl soc@0:pinctrl@44240000: request() failed for pin 116
[ 8.272987] stm32mp257-pinctrl soc@0:pinctrl@44240000: pin-116 (48010000.display-controller) status -13
[ 8.280939] stm32mp257-pinctrl soc@0:pinctrl@44240000: could not request pin 116 (PH4) from group PH4 on device soc@0:pinctrl@44240000

How can I configure this pin correctly?