STM32_LPTIM_CMP
ret = regmap_write(priv->regmap, STM32_LPTIM_CMP, 0);
STM32_LPTIM_CCR2 : STM32_LPTIM_CMP, 0);
ret = regmap_write(priv->regmap, pwm->hwpwm ? STM32_LPTIM_CCR2 : STM32_LPTIM_CMP,
regmap_read(priv->regmap, pwm->hwpwm ? STM32_LPTIM_CCR2 : STM32_LPTIM_CMP, &val);