Re: [PATCH 1/2] of: implement of_append_property

[Marco Felsch <m.felsch@pengutronix.de>]

Hi Ahmad,

On 22-08-09, Ahmad Fatoum wrote:
> board code fix up the device tree for OS consumption. Sometimes it's
> useful for the fixup to append onto an existing property.
> Add a helper that simplifies this.

do you have a particular use-case for this?

Regards,
  Marco

> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
>  drivers/of/base.c | 36 ++++++++++++++++++++++++++++++++++++
>  include/of.h      |  8 ++++++++
>  2 files changed, 44 insertions(+)
> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 101b2f74c74f..0893bdf3e04f 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -2321,6 +2321,42 @@ int of_set_property(struct device_node *np, const char *name, const void *val, i
>  	return 0;
>  }
>  
> +int of_append_property(struct device_node *np, const char *name, const void *val, int len)
> +{
> +	struct property *pp;
> +	void *buf = NULL;
> +	int orig_len = 0;
> +
> +	if (!np)
> +		return -ENOENT;
> +
> +	pp = of_find_property(np, name, NULL);
> +	if (pp) {
> +		buf = pp->value;
> +		orig_len = pp->length;
> +	}
> +
> +	buf = realloc(buf, orig_len + len);
> +	if (!buf)
> +		return -ENOMEM;
> +
> +	memcpy(buf + orig_len, val, len);
> +
> +	if (pp) {
> +		pp->value = buf;
> +		pp->length += len;
> +
> +		if (pp->value_const) {
> +			memcpy(buf, pp->value_const, orig_len);
> +			pp->value_const = NULL;
> +		}
> +	} else {
> +		pp = __of_new_property(np, name, buf, len);
> +	}
> +
> +	return 0;
> +}
> +
>  int of_property_sprintf(struct device_node *np,
>  			const char *propname, const char *fmt, ...)
>  {
> diff --git a/include/of.h b/include/of.h
> index c65cef5a5a7c..97b4b3dd79bd 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -131,6 +131,8 @@ extern struct device_node *of_get_cpu_node(int cpu, unsigned int *thread);
>  
>  extern int of_set_property(struct device_node *node, const char *p,
>  			const void *val, int len, int create);
> +extern int of_append_property(struct device_node *np, const char *p,
> +			      const void *val, int len);
>  extern struct property *of_new_property(struct device_node *node,
>  				const char *name, const void *data, int len);
>  extern struct property *of_new_property_const(struct device_node *node,
> @@ -515,6 +517,12 @@ static inline int of_set_property(struct device_node *node, const char *p,
>  	return -ENOSYS;
>  }
>  
> +static inline int of_append_property(struct device_node *np, const char *p,
> +				      const void *val, int len)
> +{
> +	return -ENOSYS;
> +}
> +
>  static inline struct property *of_new_property(struct device_node *node,
>  				const char *name, const void *data, int len)
>  {
> -- 
> 2.30.2
> 
> 
>