Function uart_config_get 

pub unsafe extern "C" fn uart_config_get(
    dev: *const device,
    cfg: *mut uart_config,
) -> c_int

@brief Get UART configuration.

Stores current UART configuration to *cfg, can be used to retrieve initial configuration after device was initialized using data from DTS.

@param dev UART device instance. @param cfg UART configuration structure.

@return 0 on success, negative errno value on failure. @retval -ENOSYS Driver does not support getting current configuration. @retval -ENOTSUP API is not enabled.