code at https://github.com/idank/qmk_firmware/tree/ps2-chibios/users/idank

qmk.diff

$ make crkbd/rev1:via:flash -e USER_NAME=idank -e POINTING_DEVICE=trackpoint -e CONVERT_TO=rp2040_ce
QMK Firmware 0.21.3
Making crkbd/rev1 with keymap via and target flash

arm-none-eabi-gcc (GNU Tools for Arm Embedded Processors 8-2019-q3-update) 8.3.1 20190703 (release) [gcc-8-branch revision 273027]
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Size before:
   text	   data	    bss	    dec	    hex	filename
      0	  39744	      0	  39744	   9b40	crkbd_rev1_via_rp2040_ce.uf2

Compiling: keyboards/crkbd/crkbd.c                                                                  [OK]
Compiling: .build/obj_crkbd_rev1/src/default_keyboard.c                                             [OK]
Compiling: quantum/keymap_introspection.c                                                           [OK]
Compiling: quantum/quantum.c                                                                        [OK]
Compiling: quantum/bitwise.c                                                                        [OK]
Compiling: quantum/led.c                                                                            [OK]
Compiling: quantum/action.c                                                                         [OK]
Compiling: quantum/action_layer.c                                                                   [OK]
Compiling: quantum/action_tapping.c                                                                 [OK]
Compiling: quantum/action_util.c                                                                    [OK]
Compiling: quantum/eeconfig.c                                                                       [OK]
Compiling: quantum/keyboard.c                                                                       [OK]
Compiling: quantum/keymap_common.c                                                                  [OK]
Compiling: quantum/keycode_config.c                                                                 [OK]
Compiling: quantum/sync_timer.c                                                                     [OK]
Compiling: quantum/logging/debug.c                                                                  [OK]
Compiling: quantum/logging/sendchar.c                                                               [OK]
Compiling: quantum/logging/print.c                                                                  [OK]
Compiling: quantum/bootmagic/bootmagic_lite.c                                                       [OK]
Compiling: quantum/bootmagic/magic.c                                                                [OK]
Compiling: quantum/matrix_common.c                                                                  [OK]
Compiling: quantum/matrix.c                                                                         [OK]
Compiling: quantum/debounce/sym_defer_g.c                                                           [OK]
Compiling: quantum/split_common/split_util.c                                                        [OK]
Compiling: quantum/split_common/transport.c                                                         [OK]
Compiling: quantum/split_common/transactions.c                                                      [OK]
Compiling: quantum/main.c                                                                           [OK]
Compiling: lib/printf/src/printf/printf.c                                                           [OK]
Compiling: quantum/mousekey.c                                                                       [OK]
Compiling: drivers/eeprom/eeprom_driver.c                                                           [OK]
Compiling: drivers/eeprom/eeprom_wear_leveling.c                                                    [OK]
Compiling: quantum/wear_leveling/wear_leveling.c                                                    [OK]
Compiling: platforms/chibios/drivers/wear_leveling/wear_leveling_rp2040_flash.c                     [OK]
Compiling: quantum/via.c                                                                            [OK]
Compiling: quantum/crc.c                                                                            [OK]
Compiling: lib/fnv/qmk_fnv_type_validation.c                                                        [OK]
Compiling: lib/fnv/hash_32a.c                                                                       [OK]
Compiling: lib/fnv/hash_64a.c                                                                       [OK]
Compiling: drivers/oled/oled_driver.c                                                               [OK]
Compiling: quantum/process_keycode/process_magic.c                                                  [OK]
Compiling: quantum/send_string/send_string.c                                                        [OK]
Compiling: drivers/ps2/ps2_mouse.c                                                                  [OK]
Compiling: platforms/chibios/drivers/ps2/ps2_io.c                                                  In file included from ./lib/chibios/os/hal/include/hal_pal.h:174,
                 from ./lib/chibios/os/hal/include/hal.h:306,
                 from platforms/chibios/drivers/ps2/ps2_io.c:6:
platforms/chibios/drivers/ps2/ps2_io.c: In function 'clock_lo':
platforms/chibios/drivers/ps2/ps2_io.c:24:35: error: 'PAL_MODE_OUTPUT_OPENDRAIN' undeclared (first use in this function); did you mean 'PAL_MODE_OUTPUT_PUSHPULL'?
     palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~
./lib/chibios/os/hal/ports/RP/LLD/GPIOv1/hal_pal_lld.h:389:37: note: in definition of macro 'pal_lld_setpadmode'
   __pal_lld_pad_set_mode(port, pad, mode)
                                     ^~~~
./lib/chibios/os/hal/include/hal_pal.h:809:3: note: in expansion of macro 'palSetPadMode'
   palSetPadMode(PAL_PORT(line), PAL_PAD(line), mode)
   ^~~~~~~~~~~~~
platforms/chibios/drivers/ps2/ps2_io.c:24:5: note: in expansion of macro 'palSetLineMode'
     palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
     ^~~~~~~~~~~~~~
platforms/chibios/drivers/ps2/ps2_io.c:24:35: note: each undeclared identifier is reported only once for each function it appears in
     palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~
./lib/chibios/os/hal/ports/RP/LLD/GPIOv1/hal_pal_lld.h:389:37: note: in definition of macro 'pal_lld_setpadmode'
   __pal_lld_pad_set_mode(port, pad, mode)
                                     ^~~~
./lib/chibios/os/hal/include/hal_pal.h:809:3: note: in expansion of macro 'palSetPadMode'
   palSetPadMode(PAL_PORT(line), PAL_PAD(line), mode)
   ^~~~~~~~~~~~~
platforms/chibios/drivers/ps2/ps2_io.c:24:5: note: in expansion of macro 'palSetLineMode'
     palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
     ^~~~~~~~~~~~~~
platforms/chibios/drivers/ps2/ps2_io.c: In function 'clock_hi':
platforms/chibios/drivers/ps2/ps2_io.c:29:35: error: 'PAL_MODE_OUTPUT_OPENDRAIN' undeclared (first use in this function); did you mean 'PAL_MODE_OUTPUT_PUSHPULL'?
     palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
                                   ^~~~~~~~~~~~~~~~~~~~~~~~~
./lib/chibios/os/hal/ports/RP/LLD/GPIOv1/hal_pal_lld.h:389:37: note: in definition of macro 'pal_lld_setpadmode'
   __pal_lld_pad_set_mode(port, pad, mode)
                                     ^~~~
./lib/chibios/os/hal/include/hal_pal.h:809:3: note: in expansion of macro 'palSetPadMode'
   palSetPadMode(PAL_PORT(line), PAL_PAD(line), mode)
   ^~~~~~~~~~~~~
platforms/chibios/drivers/ps2/ps2_io.c:29:5: note: in expansion of macro 'palSetLineMode'
     palSetLineMode(PS2_CLOCK_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
     ^~~~~~~~~~~~~~
platforms/chibios/drivers/ps2/ps2_io.c: In function 'data_lo':
platforms/chibios/drivers/ps2/ps2_io.c:44:34: error: 'PAL_MODE_OUTPUT_OPENDRAIN' undeclared (first use in this function); did you mean 'PAL_MODE_OUTPUT_PUSHPULL'?
     palSetLineMode(PS2_DATA_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
                                  ^~~~~~~~~~~~~~~~~~~~~~~~~
./lib/chibios/os/hal/ports/RP/LLD/GPIOv1/hal_pal_lld.h:389:37: note: in definition of macro 'pal_lld_setpadmode'
   __pal_lld_pad_set_mode(port, pad, mode)
                                     ^~~~
./lib/chibios/os/hal/include/hal_pal.h:809:3: note: in expansion of macro 'palSetPadMode'
   palSetPadMode(PAL_PORT(line), PAL_PAD(line), mode)
   ^~~~~~~~~~~~~
platforms/chibios/drivers/ps2/ps2_io.c:44:5: note: in expansion of macro 'palSetLineMode'
     palSetLineMode(PS2_DATA_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
     ^~~~~~~~~~~~~~
platforms/chibios/drivers/ps2/ps2_io.c: In function 'data_hi':
platforms/chibios/drivers/ps2/ps2_io.c:49:34: error: 'PAL_MODE_OUTPUT_OPENDRAIN' undeclared (first use in this function); did you mean 'PAL_MODE_OUTPUT_PUSHPULL'?
     palSetLineMode(PS2_DATA_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
                                  ^~~~~~~~~~~~~~~~~~~~~~~~~
./lib/chibios/os/hal/ports/RP/LLD/GPIOv1/hal_pal_lld.h:389:37: note: in definition of macro 'pal_lld_setpadmode'
   __pal_lld_pad_set_mode(port, pad, mode)
                                     ^~~~
./lib/chibios/os/hal/include/hal_pal.h:809:3: note: in expansion of macro 'palSetPadMode'
   palSetPadMode(PAL_PORT(line), PAL_PAD(line), mode)
   ^~~~~~~~~~~~~
platforms/chibios/drivers/ps2/ps2_io.c:49:5: note: in expansion of macro 'palSetLineMode'
     palSetLineMode(PS2_DATA_PIN, PAL_MODE_OUTPUT_OPENDRAIN);
     ^~~~~~~~~~~~~~
 [ERRORS]
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make[1]: *** [.build/obj_crkbd_rev1_via/ps2_io.o] Error 1
Make finished with errors
make: *** [crkbd/rev1:via:flash] Error 1