[PATCH v2 1/2] of: implement of_append_property

[Sascha Hauer]

On Tue, Aug 09, 2022 at 12:08:13PM +0200, Ahmad Fatoum wrote:
> barebox TLVs can be fixed up into a device tree for OS consumption. In
> case of repeated TLVs, we will want barebox to append onto an existing
> property. Add a helper that facilitates this.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
> v1 -> v2:
>   - early exist with of_new_property instead to simplify code (Sascha)
> ---
>  drivers/of/base.c | 33 +++++++++++++++++++++++++++++++++
>  include/of.h      |  8 ++++++++
>  2 files changed, 41 insertions(+)

Applied, thanks

Sascha

> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 101b2f74c74f..6d762ac43898 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -2321,6 +2321,39 @@ 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;
> +	int orig_len;
> +	void *buf;
> +
> +	if (!np)
> +		return -ENOENT;
> +
> +	pp = of_find_property(np, name, NULL);
> +	if (!pp) {
> +		of_new_property(np, name, val, len);
> +		return 0;
> +	}
> +
> +	orig_len = pp->length;
> +	buf = realloc(pp->value, orig_len + len);
> +	if (!buf)
> +		return -ENOMEM;
> +
> +	memcpy(buf + orig_len, val, len);
> +
> +	pp->value = buf;
> +	pp->length += len;
> +
> +	if (pp->value_const) {
> +		memcpy(buf, pp->value_const, orig_len);
> +		pp->value_const = NULL;
> +	}
> +
> +	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
> 
> 
> 

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