pwm_request_from_chip
pwm = pwm_request_from_chip(chip, args->args[0], NULL);
pwm = pwm_request_from_chip(chip, 0, NULL);
pwm = pwm_request_from_chip(chip, hwpwm, "sysfs");
pwm = pwm_request_from_chip(chip, args.args[0], NULL);
pwm = pwm_request_from_chip(chip, chosen->index, con_id ?: dev_id);
pwm = pwm_request_from_chip(chip, offset, "pwm-gpio");