pwm_get — look up and request a PWM device
| struct pwm_device * pwm_get ( | struct device * dev, | 
| const char * con_id ); | 
   Lookup is first attempted using DT. If the device was not instantiated from
   a device tree, a PWM chip and a relative index is looked up via a table
   supplied by board setup code (see pwm_add_table).
   
Once a PWM chip has been found the specified PWM device will be requested and is ready to be used.