This drivers adds support to the STM32 USART controller, which is a
standard serial driver.
Tested-by: NChanwoo Choi <cw00.choi@samsung.com>
Reviewed-by: NPeter Hurley <peter@hurleysoftware.com>
Reviewed-by: NVladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Reviewed-by: NAndy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: NMaxime Coquelin <mcoquelin.stm32@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>