[PATCH 04/16] serial: mvebu-uart: support probe of multiple ports

From: gregory.clement@free-electrons•com (Gregory CLEMENT)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 04/16] serial: mvebu-uart: support probe of multiple ports
Date: Fri, 06 Oct 2017 14:23:55 +0200	[thread overview]
Message-ID: <87poa0foro.fsf@free-electrons.com> (raw)
In-Reply-To: <20171006101344.15590-5-miquel.raynal@free-electrons.com> (Miquel Raynal's message of "Fri, 6 Oct 2017 12:13:32 +0200")

Hi Miquel,

 On ven., oct. 06 2017, Miquel Raynal <miquel.raynal@free-electrons•com> wrote:

> From: Allen Yan <yanwei@marvell•com>
>
> Until now, the mvebu-uart driver only supported probing a single UART
> port. However, some platforms have multiple instances of this UART
> controller, and therefore the driver should support multiple ports.
>
> In order to achieve this, we make sure to assign port->line properly,
> instead of hardcoding it to zero.
>
> Signed-off-by: Allen Yan <yanwei@marvell•com>
> Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons•com>
> ---
>  drivers/tty/serial/mvebu-uart.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/tty/serial/mvebu-uart.c b/drivers/tty/serial/mvebu-uart.c
> index 7e0a3e9fee15..25b11ede3a97 100644
> --- a/drivers/tty/serial/mvebu-uart.c
> +++ b/drivers/tty/serial/mvebu-uart.c
> @@ -560,7 +560,16 @@ static int mvebu_uart_probe(struct platform_device *pdev)
>  		return -EINVAL;
>  	}
>  
> -	port = &mvebu_uart_ports[0];
> +	if (pdev->dev.of_node)
> +		pdev->id = of_alias_get_id(pdev->dev.of_node, "serial");

If the id is retrieved using an of_ function, then I think that the
driver would depend on OF_CONFIG.

Gregory

> +
> +	if (pdev->id >= MVEBU_NR_UARTS) {
> +		dev_err(&pdev->dev, "cannot have more than %d UART ports\n",
> +			MVEBU_NR_UARTS);
> +		return -EINVAL;
> +	}
> +
> +	port = &mvebu_uart_ports[pdev->id];
>  
>  	spin_lock_init(&port->lock);
>  
> @@ -572,7 +581,7 @@ static int mvebu_uart_probe(struct platform_device *pdev)
>  	port->fifosize   = 32;
>  	port->iotype     = UPIO_MEM32;
>  	port->flags      = UPF_FIXED_PORT;
> -	port->line       = 0; /* single port: force line number to  0 */
> +	port->line       = pdev->id;
>  
>  	port->irq        = irq->start;
>  	port->irqflags   = 0;
> -- 
> 2.11.0
>
>
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-- 
Gregory Clement, Free Electrons
Kernel, drivers, real-time and embedded Linux
development, consulting, training and support.
http://free-electrons.com