PWM_CMR
val = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm, PWM_CMR);
atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, val);
u32 cmr = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm, PWM_CMR);
val = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm, PWM_CMR);
atmel_pwm_ch_writel(atmel_pwm, pwm->hwpwm, PWM_CMR, val);
cmr = atmel_pwm_ch_readl(atmel_pwm, pwm->hwpwm, PWM_CMR);