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authorAhmad Fatoum <a.fatoum@pengutronix.de>2020-09-30 14:53:01 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2020-10-02 06:09:59 +0200
commit09cbc3fbdab5f3118062ceeefb0c1b043a75b3fb (patch)
tree8a1191179d41869146e25b03ec00ee0e4d2d36d2 /drivers
parentf91786df4b06af94a2bc59a8290e84668aa49358 (diff)
downloadbarebox-09cbc3fbdab5f3118062ceeefb0c1b043a75b3fb.tar.gz
barebox-09cbc3fbdab5f3118062ceeefb0c1b043a75b3fb.tar.xz
of: implement of_property_write_strings for multiple strings
The current way to set a property with multiple values (e.g. compatible strings) is to have char properties[] = "st,stm32mp157c-dk2\0st,stm32mp157"; of_set_property(np, "compatible", properties, sizeof(properties), 1); Add a new helper to make this easier at the cost of one runtime reallocation: of_property_write_strings(np, "compatible, "st,stm32mp157c-dk2", "st,stm32mp157", NULL); Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/of/base.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/of/base.c b/drivers/of/base.c
index 0a2632f963..63cc2e586c 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -23,6 +23,7 @@
#include <memory.h>
#include <linux/sizes.h>
#include <of_graph.h>
+#include <string.h>
#include <linux/ctype.h>
#include <linux/amba/bus.h>
#include <linux/err.h>
@@ -1183,6 +1184,53 @@ int of_property_write_u64_array(struct device_node *np,
}
/**
+ * of_property_write_strings - Write strings to a property. If
+ * the property does not exist, it will be created and appended to the given
+ * device node.
+ *
+ * @np: device node to which the property value is to be written.
+ * @propname: name of the property to be written.
+ * @...: pointers to strings to write
+ *
+ * Search for a property in a device node and write a string to
+ * it. If the property does not exist, it will be created and appended to
+ * the device node. Returns 0 on success, -ENOMEM if the property or array
+ * of elements cannot be created, -EINVAL if no strings specified.
+ */
+int of_property_write_strings(struct device_node *np,
+ const char *propname, ...)
+{
+ const char *val;
+ char *buf = NULL, *next;
+ size_t len = 0;
+ va_list ap;
+ int ret = 0;
+
+ va_start(ap, propname);
+ for (val = va_arg(ap, char *); val; val = va_arg(ap, char *))
+ len += strlen(val) + 1;
+ va_end(ap);
+
+ if (!len)
+ return -EINVAL;
+
+ buf = malloc(len);
+ if (!buf)
+ return -ENOMEM;
+
+ next = buf;
+
+ va_start(ap, propname);
+ for (val = va_arg(ap, char *); val; val = va_arg(ap, char *))
+ next = stpcpy(next, val) + 1;
+ va_end(ap);
+
+ ret = of_set_property(np, propname, buf, len, 1);
+ free(buf);
+ return ret;
+}
+
+/**
* of_property_write_string - Write a string to a property. If
* the property does not exist, it will be created and appended to the given
* device node.