RTEMS | bsps/arm/beagle: Fix GPIO output clear bug (!1469)

[Yang Zhang (@Chloe)]

Yang Zhang created a merge request: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1469

Project:Branches: Chloe/rtems:fix-beagle-gpio-clear to rtems/rtos/rtems:main
Author:   Yang Zhang



## Summary

bsps/arm/beagle: Fix GPIO output clear bug

AM335X_GPIO_CLEARDATAOUT and AM335X_GPIO_SETDATAOUT are write-1-to-clear
and write-1-to-set registers. Reading either register returns the current
GPIO_DATAOUT state.

Using mmio_set() performed a read-modify-write on these registers. For
CLEARDATAOUT, this wrote 1s for all currently active output pins, causing
all set pins in the bank to be unintentionally cleared whenever any single
pin was cleared.

Fix this by using mmio_write() instead of mmio_set() to write only the
target pin mask directly without reading back the current output state.

Fixes #5235.


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View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1469
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