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Date: Wed, 2 Mar 2016 16:35:51 -0500
From: "David Rivshin (Allworx)" <drivshin.allworx@...il.com>
To: devicetree@...r.kernel.org
Cc: Rob Herring <robh+dt@...nel.org>,
Frank Rowand <frowand.list@...il.com>,
Grant Likely <grant.likely@...aro.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH] of: add 'const' for of_property_*_string*() parameter '*np'
From: David Rivshin <drivshin@...worx.com>
The of_property_{read,count,match}_string* family of functions never
modify the struct device_node pointer that is passed in, so there is no
reason for it to be non-const. Equivalent functions for all other types
already take a 'const struct device_node *np'.
Signed-off-by: David Rivshin <drivshin@...worx.com>
---
MAINTAINTERS says that the appropriate tree is
git://git.kernel.org/pub/scm/linux/kernel/git/glikely/linux.git
but it looks like that hasn't been updated in a while. So this patch
is based off the "for-next" branch of
git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git
instead. Let me know if you need me to respin from another tree/branch.
drivers/of/base.c | 15 ++++++++-------
include/linux/of.h | 18 +++++++++---------
2 files changed, 17 insertions(+), 16 deletions(-)
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 017dd94..b299de2 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -1341,10 +1341,10 @@ EXPORT_SYMBOL_GPL(of_property_read_u64_array);
*
* The out_string pointer is modified only if a valid string can be decoded.
*/
-int of_property_read_string(struct device_node *np, const char *propname,
+int of_property_read_string(const struct device_node *np, const char *propname,
const char **out_string)
{
- struct property *prop = of_find_property(np, propname, NULL);
+ const struct property *prop = of_find_property(np, propname, NULL);
if (!prop)
return -EINVAL;
if (!prop->value)
@@ -1365,10 +1365,10 @@ EXPORT_SYMBOL_GPL(of_property_read_string);
* This function searches a string list property and returns the index
* of a specific string value.
*/
-int of_property_match_string(struct device_node *np, const char *propname,
+int of_property_match_string(const struct device_node *np, const char *propname,
const char *string)
{
- struct property *prop = of_find_property(np, propname, NULL);
+ const struct property *prop = of_find_property(np, propname, NULL);
size_t l;
int i;
const char *p, *end;
@@ -1404,10 +1404,11 @@ EXPORT_SYMBOL_GPL(of_property_match_string);
* Don't call this function directly. It is a utility helper for the
* of_property_read_string*() family of functions.
*/
-int of_property_read_string_helper(struct device_node *np, const char *propname,
- const char **out_strs, size_t sz, int skip)
+int of_property_read_string_helper(const struct device_node *np,
+ const char *propname, const char **out_strs,
+ size_t sz, int skip)
{
- struct property *prop = of_find_property(np, propname, NULL);
+ const struct property *prop = of_find_property(np, propname, NULL);
int l = 0, i = 0;
const char *p, *end;
diff --git a/include/linux/of.h b/include/linux/of.h
index dc6e396..7fcb681 100644
--- a/include/linux/of.h
+++ b/include/linux/of.h
@@ -296,13 +296,13 @@ extern int of_property_read_u64_array(const struct device_node *np,
u64 *out_values,
size_t sz);
-extern int of_property_read_string(struct device_node *np,
+extern int of_property_read_string(const struct device_node *np,
const char *propname,
const char **out_string);
-extern int of_property_match_string(struct device_node *np,
+extern int of_property_match_string(const struct device_node *np,
const char *propname,
const char *string);
-extern int of_property_read_string_helper(struct device_node *np,
+extern int of_property_read_string_helper(const struct device_node *np,
const char *propname,
const char **out_strs, size_t sz, int index);
extern int of_device_is_compatible(const struct device_node *device,
@@ -538,14 +538,14 @@ static inline int of_property_read_u64_array(const struct device_node *np,
return -ENOSYS;
}
-static inline int of_property_read_string(struct device_node *np,
+static inline int of_property_read_string(const struct device_node *np,
const char *propname,
const char **out_string)
{
return -ENOSYS;
}
-static inline int of_property_read_string_helper(struct device_node *np,
+static inline int of_property_read_string_helper(const struct device_node *np,
const char *propname,
const char **out_strs, size_t sz, int index)
{
@@ -571,7 +571,7 @@ static inline int of_property_read_u64(const struct device_node *np,
return -ENOSYS;
}
-static inline int of_property_match_string(struct device_node *np,
+static inline int of_property_match_string(const struct device_node *np,
const char *propname,
const char *string)
{
@@ -773,7 +773,7 @@ static inline int of_property_count_u64_elems(const struct device_node *np,
*
* If @out_strs is NULL, the number of strings in the property is returned.
*/
-static inline int of_property_read_string_array(struct device_node *np,
+static inline int of_property_read_string_array(const struct device_node *np,
const char *propname, const char **out_strs,
size_t sz)
{
@@ -792,7 +792,7 @@ static inline int of_property_read_string_array(struct device_node *np,
* does not have a value, and -EILSEQ if the string is not null-terminated
* within the length of the property data.
*/
-static inline int of_property_count_strings(struct device_node *np,
+static inline int of_property_count_strings(const struct device_node *np,
const char *propname)
{
return of_property_read_string_helper(np, propname, NULL, 0, 0);
@@ -816,7 +816,7 @@ static inline int of_property_count_strings(struct device_node *np,
*
* The out_string pointer is modified only if a valid string can be decoded.
*/
-static inline int of_property_read_string_index(struct device_node *np,
+static inline int of_property_read_string_index(const struct device_node *np,
const char *propname,
int index, const char **output)
{
--
2.5.0
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