linux-kernel - Re: [PATCH] of/fdt: fix aliases with baudrate in earlycon

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Date:	Sat, 10 Oct 2015 08:48:15 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Stefan Agner <stefan@...er.ch>, robh+dt@...nel.org,
	frowand.list@...il.com, grant.likely@...aro.org
Cc:	galak@...eaurora.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of/fdt: fix aliases with baudrate in earlycon

On 10/10/2015 04:29 AM, Stefan Agner wrote:
> Many boards use an alias in the stdout-path specification along
> with console options after a colon (e.g. serial0:115200n8). When
> using earlycon, this specification currently does not work. While
> fdt_path_offset supports alias resolution, it does not remove the
> console options by itself. Use the fdt_path_offset_namelen variant
> and provide the length of the alias to enable aliases with console
> options in the stdout-path.
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
> Hi,
> 
> Stumbled upon this while testing 32-bit ARM earlycon support. It
> seems that this once already came up on the list:
> https://lkml.org/lkml/2015/3/13/562

Yeah, looks like my patch got lost somewhere.
https://lkml.org/lkml/2015/4/8/604

Regards,
Peter Hurley


> 
>  drivers/of/fdt.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 6e82bc42..9fc3568 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -813,8 +813,11 @@ static int __init early_init_dt_scan_chosen_serial(void)
>  	if (!p || !l)
>  		return -ENOENT;
>  
> +	/* Remove console options if present */
> +	l = strchrnul(p, ':') - p;
> +
>  	/* Get the node specified by stdout-path */
> -	offset = fdt_path_offset(fdt, p);
> +	offset = fdt_path_offset_namelen(fdt, p, l);
>  	if (offset < 0)
>  		return -ENODEV;
>  
> 

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