[U-Boot] [PATCH v2] EXYNOS: SMDK5250: Support all 4 UARTs

[Chander Kashyap]

On 13 February 2012 23:08, Doug Anderson <dianders at chromium.org> wrote:
> This properly configures the mux to enable all UARTs.
>
> This also fixes things so that we don't configure balls XUCTSN_1 and
> XURTSN_1 as UART1 configuration (RTS/CTS), since they aren't
> connected.
>
> Signed-off-by: Doug Anderson <dianders at chromium.org>
> ---
> Changes in v2:
> - Removed #ifdefs and tested SERIAL_MULTI by setting stdin/out/err to
> s5pserN and validating that serial moved.
>
>  board/samsung/smdk5250/smdk5250.c |   44 +++++++++++++++++++++++++++++++++++-
>  1 files changed, 42 insertions(+), 2 deletions(-)
>
> diff --git a/board/samsung/smdk5250/smdk5250.c b/board/samsung/smdk5250/smdk5250.c
> index 928c08f..32786e2 100644
> --- a/board/samsung/smdk5250/smdk5250.c
> +++ b/board/samsung/smdk5250/smdk5250.c
> @@ -224,11 +224,51 @@ static void board_uart_init(void)
>                (struct exynos5_gpio_part1 *) samsung_get_base_gpio_part1();
>        int i;
>
> -       /* UART1 GPIOs (part1) : GPA0CON[7:4] 0x2222 */
> -       for (i = 4; i < 8; i++) {
> +       /*
> +        * UART0 GPIOs : GPA0CON[3:0] 0x2222
> +        * Must set CFG17 switches to select UART0 to use.
> +        */
> +       for (i = 0; i <= 3; i++) {
>                s5p_gpio_set_pull(&gpio1->a0, i, GPIO_PULL_NONE);
>                s5p_gpio_cfg_pin(&gpio1->a0, i, GPIO_FUNC(0x2));
>        }
> +
> +       /*
> +        * UART1 GPIOs : GPA0CON[5:4] 0x22
> +        * Must set CFG17 switches to select UART1 to use.
> +        *
> +        * This only sets RXD/TXD, as RTS/CTS need a resistor soldered down
> +        * in order to use them (so that those pins can be used for I2C).
> +        */
> +       for (i = 4; i <= 5; i++) {
> +               s5p_gpio_set_pull(&gpio1->a0, i, GPIO_PULL_NONE);
> +               s5p_gpio_cfg_pin(&gpio1->a0, i, GPIO_FUNC(0x2));
> +       }
> +
> +       /*
> +        * UART2 GPIOs : GPA1CON[1:0] 0x22
> +        * Must set CFG17 switches to select UART2 to use.
> +        *
> +        * This only sets RXD/TXD, as RTS/CTS need a resistor soldered down
> +        * in order to use them (so that those pins can be used for I2C).
> +        */
> +       for (i = 0; i <= 1; i++) {
> +               s5p_gpio_set_pull(&gpio1->a1, i, GPIO_PULL_NONE);
> +               s5p_gpio_cfg_pin(&gpio1->a1, i, GPIO_FUNC(0x2));
> +       }
> +
> +       /*
> +        * UART3 GPIOs : GPA1CON[5:4] 0x22
> +        * Must set CFG16 switches to select UART3 to use.
> +        */
> +       for (i = 4; i <= 5; i++) {
> +               s5p_gpio_set_pull(&gpio1->a1, i, GPIO_PULL_NONE);
> +               s5p_gpio_cfg_pin(&gpio1->a1, i, GPIO_FUNC(0x2));
> +       }
> +
> +       /*
> +        * There's no mux for UART4--it's internal only
> +        */
>  }
>
>  #ifdef CONFIG_BOARD_EARLY_INIT_F
> --
> 1.7.7.3
>
Acked-by: Chander kashyap <chander.kashyap at linaro.org>


-- 
with warm regards,
Chander Kashyap