[PATCH] of: implement of_rename_property()

[Sascha Hauer]

On Mon, Sep 05, 2022 at 12:36:39PM +0200, Ahmad Fatoum wrote:
> It's often desirable to have the same barebox binary for multiple
> variants. DT-level differences between the variants are often handled
> by having extra device tree nodes that are disabled by default and
> patched as appropriate by board code. It can be useful to have a finer
> granularity for patching though, that covers only a select property, e.g.:
> 
>    usbotg1 {
> 	vbus-supply = <&reg_vbus_common>;
> 	vendor,specialvariant-vbus-supply = <&reg_vbus_specialvariant>;
>    };
> 
> The new of_rename_property allows board code to easily activate the
> alternative vbus supply on the specialvariant:
> 
>   of_rename_property(np, "vendor,specialvariant-vbus-supply",
> 			 "vbus-supply");
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
> ---
>  drivers/of/base.c             | 16 ++++++++++++++++
>  include/of.h                  |  8 ++++++++
>  test/self/of_manipulation.c   | 10 ++++++++++
>  test/self/of_manipulation.dts |  6 ++++--
>  4 files changed, 38 insertions(+), 2 deletions(-)

Applied, thanks

Sascha

> 
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index 6a51dd71793d..212b226eb55c 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -2301,6 +2301,22 @@ void of_delete_property(struct property *pp)
>  	free(pp);
>  }
>  
> +struct property *of_rename_property(struct device_node *np,
> +				    const char *old_name, const char *new_name)
> +{
> +	struct property *pp;
> +
> +	pp = of_find_property(np, old_name, NULL);
> +	if (!pp)
> +		return NULL;
> +
> +	of_property_write_bool(np, new_name, false);
> +
> +	free(pp->name);
> +	pp->name = xstrdup(new_name);
> +	return pp;
> +}
> +
>  /**
>   * of_set_property - create a property for a given node
>   * @node - the node
> diff --git a/include/of.h b/include/of.h
> index 29df7d912b33..153e75d3e51d 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -143,6 +143,8 @@ extern struct property *of_new_property_const(struct device_node *node,
>  extern struct property *__of_new_property(struct device_node *node,
>  					  const char *name, void *data, int len);
>  extern void of_delete_property(struct property *pp);
> +extern struct property *of_rename_property(struct device_node *np,
> +					   const char *old_name, const char *new_name);
>  
>  extern struct device_node *of_find_node_by_name(struct device_node *from,
>  	const char *name);
> @@ -550,6 +552,12 @@ static inline void of_delete_property(struct property *pp)
>  {
>  }
>  
> +static inline struct property *of_rename_property(struct device_node *np,
> +						  const char *old_name, const char *new_name)
> +{
> +	return NULL;
> +}
> +
>  static inline int of_property_read_u32_index(const struct device_node *np,
>  				const char *propname, u32 index, u32 *out_value)
>  {
> diff --git a/test/self/of_manipulation.c b/test/self/of_manipulation.c
> index 6eb6062e126b..7e30a60ca687 100644
> --- a/test/self/of_manipulation.c
> +++ b/test/self/of_manipulation.c
> @@ -57,6 +57,16 @@ static void test_of_basics(struct device_node *root)
>  	of_property_write_bool(node1, "property1", true);
>  
>  	assert_equal(node1, node2);
> +
> +	of_property_write_bool(node2, "property1", false);
> +	of_property_write_u32(node2, "property1", 1);
> +	of_property_write_u32(node2, "property2", 2);
> +
> +	of_property_write_u32(node1, "property3", 1);
> +	of_property_write_u32(node1, "property2", 2);
> +	of_rename_property(node1, "property3", "property1");
> +
> +	assert_equal(node1, node2);
>  }
>  
>  static void test_of_property_strings(struct device_node *root)
> diff --git a/test/self/of_manipulation.dts b/test/self/of_manipulation.dts
> index a69d944c1eb5..2cc6773fa98e 100644
> --- a/test/self/of_manipulation.dts
> +++ b/test/self/of_manipulation.dts
> @@ -4,12 +4,14 @@
>  
>  / {
>  	node1 {
> -		property1;
> +		property1 = <1>;
> +		property2 = <2>;
>  		node21 { };
>  	};
>  
>  	node2 {
> -		property1;
> +		property1 = <1>;
> +		property2 = <2>;
>  		node21 { };
>  	};
>  
> -- 
> 2.30.2
> 
> 
> 

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