Voron Switchwire - Y-axis Sensorless Homing - TMC2209, G28.

X axis - Microswitch Endstop
Y axis - Sensorless (TMC2209 Stepper Motor Driver Virtual Endstop)
Z axis - Inductive Probe
BTT SKR mini E3 V2.0 + Raspberry Pi4 8GB + Octoprint + Octopi + Klipper

printer.cfg 

...

[stepper_y]
step_pin: PB10
dir_pin: !PB2
enable_pin: !PB11
step_distance: 0.0125

###Sensorless Homing
#endstop_pin: ^PC1
endstop_pin: tmc2209_stepper_y:virtual_endstop
homing_retract_dist: 0
###End Sensorless Homing

position_endstop: 227
position_min: 0
position_max: 227
homing_speed: 70
homing_positive_dir: true

[tmc2209 stepper_y]
uart_pin: PC11
tx_pin: PC10
uart_address: 2
microsteps: 16
run_current: 0.5
hold_current: 0.3
interpolate: True
stealthchop_threshold: 250

###Sensorless Homing
diag_pin: ^PC1
driver_SGTHRS: 170
###End Sensorless Homing

https://hackaday.io/project/174810/components