[PATCH v3 4/7] tty/serial: at91: use mctrl_gpio helpers

[Alexander Shiyan]

On Mon, 17 Feb 2014 17:57:24 +0100
Richard Genoud <richard.genoud at gmail.com> wrote:

> On sam9x5, dedicated CTS (and RTS) pins are unusable together with the
> LCDC, the EMAC, or the MMC because they share the same line.
> 
> Moreover, the USART controller doesn't handle DTR/DSR/DCD/RI signals,
> so we have to control them via GPIO.
> 
> This patch permits to use GPIOs to control the CTS/RTS/DTR/DSR/DCD/RI
> signals.
> 
> Signed-off-by: Richard Genoud <richard.genoud at gmail.com>
...
> diff --git a/arch/arm/mach-at91/at91rm9200_devices.c b/arch/arm/mach-at91/at91rm9200_devices.c
> index 605add05af7e..6dd386e3d9fe 100644
> --- a/arch/arm/mach-at91/at91rm9200_devices.c
> +++ b/arch/arm/mach-at91/at91rm9200_devices.c
...
> @@ -961,7 +961,14 @@ static struct resource uart0_resources[] = {
>  static struct atmel_uart_data uart0_data = {
>  	.use_dma_tx	= 1,
>  	.use_dma_rx	= 1,
> -	.rts_gpio	= -EINVAL,
> +};
> +
> +struct gpiod_lookup_table uart0_gpios_table = {

static

> +	.dev_id = "atmel_usart",
> +	.table = {
> +		GPIO_LOOKUP("pioA", 21, "rts", GPIO_ACTIVE_LOW),
> +		{ },
> +	},
>  };
...

-- 
Alexander Shiyan <shc_work at mail.ru>