[U-Boot] [PATCH 1/2] serial: mxc: support DTE mode

[Stefan Agner <stefan.agner@toradex.com>]

Hi Ryan,


On 19.01.2018 10:53, Ryan Harkin wrote:
> Add DTE mode support via Kconfig on the MXC uart.

Make use of the driver model, there DTE is supported already today:
https://lists.denx.de/pipermail/u-boot/2016-July/259573.html

--
Stefan

>
> Signed-off-by: Ryan Harkin <ryan.harkin@linaro.org>
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
> ---
>  drivers/serial/Kconfig      |  7 +++++++
>  drivers/serial/serial_mxc.c | 10 ++++++++--
>  2 files changed, 15 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig
> index 122b8e7..0df57c0 100644
> --- a/drivers/serial/Kconfig
> +++ b/drivers/serial/Kconfig
> @@ -597,4 +597,11 @@ config SYS_SDMR
>  	depends on MPC8XX_CONS
>  	default 0
>  
> +config SERIAL_MXC_DTE_MODE
> +	bool "Use DTE mode for the MXC UART"
> +	default n
> +	help
> +	  This is used to set DTE mode on the serial console controlled by
> +	  serial_mxc.c.
> +
>  endmenu
> diff --git a/drivers/serial/serial_mxc.c b/drivers/serial/serial_mxc.c
> index cce80a8..e7ea30c 100644
> --- a/drivers/serial/serial_mxc.c
> +++ b/drivers/serial/serial_mxc.c
> @@ -111,6 +111,12 @@
>  #define TXTL		2  /* reset default */
>  #define RXTL		1  /* reset default */
>  
> +#ifdef CONFIG_SERIAL_MXC_DTE_MODE
> +#define MXC_DTE_MODE	true
> +#else
> +#define MXC_DTE_MODE	false
> +#endif
> +
>  DECLARE_GLOBAL_DATA_PTR;
>  
>  struct mxc_uart {
> @@ -189,7 +195,7 @@ static void mxc_serial_setbrg(void)
>  	if (!gd->baudrate)
>  		gd->baudrate = CONFIG_BAUDRATE;
>  
> -	_mxc_serial_setbrg(mxc_base, clk, gd->baudrate, false);
> +	_mxc_serial_setbrg(mxc_base, clk, gd->baudrate, MXC_DTE_MODE);
>  }
>  
>  static int mxc_serial_getc(void)
> @@ -367,7 +373,7 @@ static inline void _debug_uart_init(void)
>  
>  	_mxc_serial_init(base);
>  	_mxc_serial_setbrg(base, CONFIG_DEBUG_UART_CLOCK,
> -			   CONFIG_BAUDRATE, false);
> +			   CONFIG_BAUDRATE, MXC_DTE_MODE);
>  }
>  
>  static inline void _debug_uart_putc(int ch)