STM32_LPTIM_ARR
regmap_write(priv->reg, STM32_LPTIM_ARR, evt);
regmap_write(priv->reg, STM32_LPTIM_ARR, evt);
ret = regmap_write(priv->regmap, STM32_LPTIM_ARR, priv->ceiling);
ret = regmap_read(priv->regmap, STM32_LPTIM_ARR, &arr);
ret = regmap_write(priv->regmap, STM32_LPTIM_ARR, prd - 1);
regmap_read(priv->regmap, STM32_LPTIM_ARR, &prd);