Re: [PATCH 3/9] serial: atmel: Use common rs485 device tree parsing function

[Richard Genoud <richard.genoud-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

On 21/06/2017 12:21, Uwe Kleine-König wrote:
> From: Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> 
> We just got a common helper for parsing the rs485 specific
> device tree properties. Use it and drop the open coded parser.
> 
> Note that the common function is more strict, so some device trees
> needed fixing in the previous commit.
> 
> Signed-off-by: Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> Signed-off-by: Uwe Kleine-König <u.kleine-koenig-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
> ---
> Cc: Richard Genoud <richard.genoud-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> 
>  drivers/tty/serial/atmel_serial.c | 17 +----------------
>  1 file changed, 1 insertion(+), 16 deletions(-)
> 
> diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
> index b753d2020068..a6b0c0087e2d 100644
> --- a/drivers/tty/serial/atmel_serial.c
> +++ b/drivers/tty/serial/atmel_serial.c
> @@ -1706,22 +1706,7 @@ static void atmel_init_rs485(struct uart_port *port,
>  	struct atmel_uart_data *pdata = dev_get_platdata(&pdev->dev);
>  
>  	if (np) {
> -		struct serial_rs485 *rs485conf = &port->rs485;
> -		u32 rs485_delay[2];
> -		/* rs485 properties */
> -		if (of_property_read_u32_array(np, "rs485-rts-delay",
> -					rs485_delay, 2) == 0) {
> -			rs485conf->delay_rts_before_send = rs485_delay[0];
> -			rs485conf->delay_rts_after_send = rs485_delay[1];
> -			rs485conf->flags = 0;
> -		}
> -
> -		if (of_get_property(np, "rs485-rx-during-tx", NULL))
> -			rs485conf->flags |= SER_RS485_RX_DURING_TX;
> -
> -		if (of_get_property(np, "linux,rs485-enabled-at-boot-time",
> -								NULL))
> -			rs485conf->flags |= SER_RS485_ENABLED;
> +		of_get_rs485_mode(np, &port->rs485);
>  	} else if (pdata) {
>  		port->rs485 = pdata->rs485;
>  	} else {
> 
I don't kown if the serie will make it to 4.12, but as you may have
noticed, this patch will break with tty-next.
In fact, you could get rid of atmel_init_rs485() and just replace it
with of_get_rs485_mode() :)

Thanks !

Richard
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