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* [PATCH v2] of: implement of_prepend_property
@ 2022-09-12 15:54 Ahmad Fatoum
  2022-09-13  8:06 ` Sascha Hauer
  0 siblings, 1 reply; 2+ messages in thread
From: Ahmad Fatoum @ 2022-09-12 15:54 UTC (permalink / raw)
  To: barebox; +Cc: Ahmad Fatoum

Like of_append_property for adding at the end of properties, implement
of_prepend_property for placing data into the front.

This is especially useful to fixup most-specific compatibles into
existing nodes.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
v1 -> v2:
  - simplify with malloc/memcpy instead of realloc/memmove (Sascha)
---
 drivers/of/base.c           | 30 ++++++++++++++++++++++++++++++
 include/of.h                |  8 ++++++++
 test/self/of_manipulation.c |  2 +-
 3 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/drivers/of/base.c b/drivers/of/base.c
index 212b226eb55c..ea2a88764bb2 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -2378,6 +2378,36 @@ int of_append_property(struct device_node *np, const char *name, const void *val
 	return 0;
 }
 
+int of_prepend_property(struct device_node *np, const char *name, const void *val, int len)
+{
+	struct property *pp;
+	const void *oldval;
+	void *buf;
+	int oldlen;
+
+	pp = of_find_property(np, name, &oldlen);
+	if (!pp) {
+		of_new_property(np, name, val, len);
+		return 0;
+	}
+
+	oldval = of_property_get_value(pp);
+
+	buf = malloc(len + oldlen);
+	if (!buf)
+		return -ENOMEM;
+
+	memcpy(buf, val, len);
+	memcpy(buf + len, oldval, oldlen);
+
+	free(pp->value);
+	pp->value = buf;
+	pp->length = len + oldlen;
+	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 153e75d3e51d..052d5fcad84c 100644
--- a/include/of.h
+++ b/include/of.h
@@ -135,6 +135,8 @@ 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 int of_prepend_property(struct device_node *np, const char *name,
+			       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,
@@ -536,6 +538,12 @@ static inline int of_append_property(struct device_node *np, const char *p,
 	return -ENOSYS;
 }
 
+static inline int of_prepend_property(struct device_node *np, const char *name,
+				      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)
 {
diff --git a/test/self/of_manipulation.c b/test/self/of_manipulation.c
index 7e30a60ca687..f7f95fa269af 100644
--- a/test/self/of_manipulation.c
+++ b/test/self/of_manipulation.c
@@ -103,9 +103,9 @@ static void test_of_property_strings(struct device_node *root)
 
 	of_append_property(np4, "property-single", "ayy", 4);
 
-	of_append_property(np4, "property-multi", "ayy", 4);
 	of_append_property(np4, "property-multi", "bee", 4);
 	of_append_property(np4, "property-multi", "sea", 4);
+	of_prepend_property(np4, "property-multi", "ayy", 4);
 
 	assert_equal(np3, np4);
 }
-- 
2.30.2




^ permalink raw reply	[flat|nested] 2+ messages in thread

* Re: [PATCH v2] of: implement of_prepend_property
  2022-09-12 15:54 [PATCH v2] of: implement of_prepend_property Ahmad Fatoum
@ 2022-09-13  8:06 ` Sascha Hauer
  0 siblings, 0 replies; 2+ messages in thread
From: Sascha Hauer @ 2022-09-13  8:06 UTC (permalink / raw)
  To: Ahmad Fatoum; +Cc: barebox

On Mon, Sep 12, 2022 at 05:54:36PM +0200, Ahmad Fatoum wrote:
> Like of_append_property for adding at the end of properties, implement
> of_prepend_property for placing data into the front.
> 
> This is especially useful to fixup most-specific compatibles into
> existing nodes.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
> ---
> v1 -> v2:
>   - simplify with malloc/memcpy instead of realloc/memmove (Sascha)
> ---
>  drivers/of/base.c           | 30 ++++++++++++++++++++++++++++++
>  include/of.h                |  8 ++++++++
>  test/self/of_manipulation.c |  2 +-
>  3 files changed, 39 insertions(+), 1 deletion(-)

Applied, thanks

Sascha

> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 212b226eb55c..ea2a88764bb2 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -2378,6 +2378,36 @@ int of_append_property(struct device_node *np, const char *name, const void *val
>  	return 0;
>  }
>  
> +int of_prepend_property(struct device_node *np, const char *name, const void *val, int len)
> +{
> +	struct property *pp;
> +	const void *oldval;
> +	void *buf;
> +	int oldlen;
> +
> +	pp = of_find_property(np, name, &oldlen);
> +	if (!pp) {
> +		of_new_property(np, name, val, len);
> +		return 0;
> +	}
> +
> +	oldval = of_property_get_value(pp);
> +
> +	buf = malloc(len + oldlen);
> +	if (!buf)
> +		return -ENOMEM;
> +
> +	memcpy(buf, val, len);
> +	memcpy(buf + len, oldval, oldlen);
> +
> +	free(pp->value);
> +	pp->value = buf;
> +	pp->length = len + oldlen;
> +	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 153e75d3e51d..052d5fcad84c 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -135,6 +135,8 @@ 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 int of_prepend_property(struct device_node *np, const char *name,
> +			       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,
> @@ -536,6 +538,12 @@ static inline int of_append_property(struct device_node *np, const char *p,
>  	return -ENOSYS;
>  }
>  
> +static inline int of_prepend_property(struct device_node *np, const char *name,
> +				      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)
>  {
> diff --git a/test/self/of_manipulation.c b/test/self/of_manipulation.c
> index 7e30a60ca687..f7f95fa269af 100644
> --- a/test/self/of_manipulation.c
> +++ b/test/self/of_manipulation.c
> @@ -103,9 +103,9 @@ static void test_of_property_strings(struct device_node *root)
>  
>  	of_append_property(np4, "property-single", "ayy", 4);
>  
> -	of_append_property(np4, "property-multi", "ayy", 4);
>  	of_append_property(np4, "property-multi", "bee", 4);
>  	of_append_property(np4, "property-multi", "sea", 4);
> +	of_prepend_property(np4, "property-multi", "ayy", 4);
>  
>  	assert_equal(np3, np4);
>  }
> -- 
> 2.30.2
> 
> 
> 

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^ permalink raw reply	[flat|nested] 2+ messages in thread

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