IPQ_PWM_REG1
ipq_pwm_reg_write(pwm, IPQ_PWM_REG1, val);
reg1 = ipq_pwm_reg_read(pwm, IPQ_PWM_REG1);
ipq_pwm_reg_write(pwm, IPQ_PWM_REG1, IPQ_PWM_REG1_UPDATE);