linux-kernel - Re: [PATCH] serial: i.MX: evaluate linux,stdout-path property

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Date:	Thu, 04 Oct 2012 07:44:45 -0500
From:	Rob Herring <robherring2@...il.com>
To:	Sascha Hauer <s.hauer@...gutronix.de>
CC:	linux-serial@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	devicetree-discuss@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	linux-arm-kernel@...ts.infradead.org,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH] serial: i.MX: evaluate linux,stdout-path property

On 10/04/2012 05:39 AM, Sascha Hauer wrote:
> devicetrees may have the linux,stdout-path property to specify the
> console. This patch adds support to the i.MX serial driver for this.
> 
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
> 
> I was originally looking for a more generic way to handle this, but
> since a struct console has no device associated to it, it's not
> possible to match a console with a device in a generic way. So we

Could we add a device ptr to struct console?

> just call add_preferred_console from the driver and let it go down
> to a string matching in the console code.
> If anyone has a better idea how to handle this, please let me know.
> Otherwise I'm happy to see this patch applied aswell.
> 
> Thanks
>  Sascha
> 
>  drivers/tty/serial/imx.c |   29 +++++++++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
> 
> diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
> index e309e8b..b52c4a7 100644
> --- a/drivers/tty/serial/imx.c
> +++ b/drivers/tty/serial/imx.c
> @@ -1397,6 +1397,32 @@ static int serial_imx_resume(struct platform_device *dev)
>  
>  #ifdef CONFIG_OF
>  /*
> + * Check if this device matches the linux,stdout-path property
> + * in the chosen node. return true if yes, false otherwise
> + */
> +static int serial_imx_is_stdoutpath(struct platform_device *pdev)

Couldn't this function be generic? Just move
IS_ENABLED(CONFIG_SERIAL_IMX_CONSOLE) outside this function. Arguably,
the presence of the property or not could replace the config option all
together.

And use a struct device so this can work with devices other than
platform devices (i.e. amba).

Rob

> +{
> +	struct device_node *dn;
> +	const char *name;
> +
> +	if (!IS_ENABLED(CONFIG_SERIAL_IMX_CONSOLE))
> +		return 0;
> +
> +	name = of_get_property(of_chosen, "linux,stdout-path", NULL);
> +	if (name == NULL)
> +		return 0;
> +
> +	dn = of_find_node_by_path(name);
> +	if (!dn)
> +		return 0;
> +
> +	if (dn == pdev->dev.of_node)
> +		return 1;
> +
> +	return 0;
> +}
> +
> +/*
>   * This function returns 1 iff pdev isn't a device instatiated by dt, 0 iff it
>   * could successfully get all information from dt or a negative errno.
>   */
> @@ -1427,6 +1453,9 @@ static int serial_imx_probe_dt(struct imx_port *sport,
>  
>  	sport->devdata = of_id->data;
>  
> +	if (serial_imx_is_stdoutpath(pdev))
> +		add_preferred_console(imx_reg.cons->name, sport->port.line, 0);
> +
>  	return 0;
>  }
>  #else
> 

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