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OF: Utility helper functions for dynamic nodes

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Introduce helper functions for working with the live DT tree,
all of them related to dynamically adding/removing nodes and
properties.

__of_prop_dup() copies a property dynamically
__of_node_alloc() creates an empty node

Bug fix about prop->len == 0 by Ionut Nicu <ioan.nicu.ext@nsn.com>

Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
[glikely: Added unittest for of_copy_property and dropped fine-grained allocations]
[glikely: removed name, type and phandle arguments from __of_node_alloc]
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Pantelis Antoniou
2014-07-04 19:58:47 +03:00
committed by Grant Likely
parent 6afc0dc381
commit 698433963b
3 changed files with 115 additions and 0 deletions
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28
drivers/of/selftest.c
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@@ -16,6 +16,8 @@
#include <linux/slab.h>
#include <linux/device.h>
#include "of_private.h"
static struct selftest_results {
int passed;
int failed;
@@ -266,6 +268,31 @@ static void __init of_selftest_property_match_string(void)
selftest(rc == -EILSEQ, "unterminated string; rc=%i", rc);
}
#define propcmp(p1, p2) (((p1)->length == (p2)->length) && \
(p1)->value && (p2)->value && \
!memcmp((p1)->value, (p2)->value, (p1)->length) && \
!strcmp((p1)->name, (p2)->name))
static void __init of_selftest_property_copy(void)
{
#ifdef CONFIG_OF_DYNAMIC
struct property p1 = { .name = "p1", .length = 0, .value = "" };
struct property p2 = { .name = "p2", .length = 5, .value = "abcd" };
struct property *new;
new = __of_prop_dup(&p1, GFP_KERNEL);
selftest(new && propcmp(&p1, new), "empty property didn't copy correctly\n");
kfree(new->value);
kfree(new->name);
kfree(new);
new = __of_prop_dup(&p2, GFP_KERNEL);
selftest(new && propcmp(&p2, new), "non-empty property didn't copy correctly\n");
kfree(new->value);
kfree(new->name);
kfree(new);
#endif
}
static void __init of_selftest_parse_interrupts(void)
{
struct device_node *np;
@@ -533,6 +560,7 @@ static int __init of_selftest(void)
of_selftest_dynamic();
of_selftest_parse_phandle_with_args();
of_selftest_property_match_string();
of_selftest_property_copy();
of_selftest_parse_interrupts();
of_selftest_parse_interrupts_extended();
of_selftest_match_node();