Re: [PATCH v3 3/3] of: support passing console options with stdout-path

[Peter Hurley]

On 11/27/2014 12:56 PM, Leif Lindholm wrote:
> Support specifying console options (like with console=ttyXN,<options>)
> by appending them to the stdout-path property after a separating ':'.
> 
> Example:
>         stdout-path = "uart0:115200";

This format breaks DT earlycon because libfdt doesn't recognize ':' as a
path terminator.

It's simple enough to fix this directly in early_init_dt_scan_chosen_serial()
but perhaps it would better to teach fdt_path_offset() to recognize ':'?

Regards,
Peter Hurley

> Signed-off-by: Leif Lindholm <leif.lindholm@xxxxxxxxxx>
> ---
>  drivers/of/base.c |    9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 7f0e5f7..6d2d45e 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -37,6 +37,7 @@ EXPORT_SYMBOL(of_allnodes);
>  struct device_node *of_chosen;
>  struct device_node *of_aliases;
>  struct device_node *of_stdout;
> +static const char *of_stdout_options;
>  
>  struct kset *of_kset;
>  
> @@ -1844,7 +1845,7 @@ void of_alias_scan(void * (*dt_alloc)(u64 size, u64 align))
>  		if (IS_ENABLED(CONFIG_PPC) && !name)
>  			name = of_get_property(of_aliases, "stdout", NULL);
>  		if (name)
> -			of_stdout = of_find_node_by_path(name);
> +			of_stdout = of_find_node_opts_by_path(name, &of_stdout_options);
>  	}
>  
>  	if (!of_aliases)
> @@ -1968,9 +1969,13 @@ EXPORT_SYMBOL_GPL(of_prop_next_string);
>   */
>  bool of_console_check(struct device_node *dn, char *name, int index)
>  {
> +	char *console_options;
> +
>  	if (!dn || dn != of_stdout || console_set_on_cmdline)
>  		return false;
> -	return !add_preferred_console(name, index, NULL);
> +
> +	console_options = kstrdup(of_stdout_options, GFP_KERNEL);
> +	return !add_preferred_console(name, index, console_options);
>  }
>  EXPORT_SYMBOL_GPL(of_console_check);
>  
> 

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