From: Thierry Reding
This function can be used to read a binary property into a buffer. One
example where this is needed is to read a MAC address from device tree.
Signed-off-by: Thierry Reding
---
drivers/core/of_access.c | 21 +
drivers/core/ofnode.c| 13 +
drivers/core/read.c | 6 ++
include/dm/of_access.h | 15 +++
include/dm/ofnode.h | 11 +++
include/dm/read.h| 17 +
6 files changed, 83 insertions(+)
diff --git a/drivers/core/of_access.c b/drivers/core/of_access.c
index 945b81448cce..d110d171a3ea 100644
--- a/drivers/core/of_access.c
+++ b/drivers/core/of_access.c
@@ -446,6 +446,27 @@ static void *of_find_property_value_of_size(const struct
device_node *np,
return prop->value;
}
+int of_read_bytes(const struct device_node *np, const char *propname,
+ u8 *buffer, int size)
+{
+ const fdt32_t *value;
+
+ debug("%s: %s: ", __func__, propname);
+
+ if (!np)
+ return -EINVAL;
+
+ value = of_find_property_value_of_size(np, propname, size);
+ if (IS_ERR(value)) {
+ debug("(not found)\n");
+ return PTR_ERR(value);
+ }
+
+ memcpy(buffer, value, size);
+
+ return 0;
+}
+
int of_read_u32(const struct device_node *np, const char *propname, u32 *outp)
{
const __be32 *val;
diff --git a/drivers/core/ofnode.c b/drivers/core/ofnode.c
index 785f5c3acf7a..21b24e5aa00e 100644
--- a/drivers/core/ofnode.c
+++ b/drivers/core/ofnode.c
@@ -15,6 +15,19 @@
#include
#include
+int ofnode_read_bytes(ofnode node, const char *propname, u8 *buffer, int size)
+{
+ assert(ofnode_valid(node));
+ debug("%s: %s: ", __func__, propname);
+
+ if (ofnode_is_np(node))
+ return of_read_bytes(ofnode_to_np(node), propname, buffer,
+size);
+
+ return fdtdec_get_byte_array(gd->fdt_blob, ofnode_to_offset(node),
+propname, buffer, size);
+}
+
int ofnode_read_u32(ofnode node, const char *propname, u32 *outp)
{
assert(ofnode_valid(node));
diff --git a/drivers/core/read.c b/drivers/core/read.c
index 6bda077a34b9..9919ec19d4d8 100644
--- a/drivers/core/read.c
+++ b/drivers/core/read.c
@@ -11,6 +11,12 @@
#include
#include
+int dev_read_bytes(struct udevice *dev, const char *propname, u8 *buffer,
+ int size)
+{
+ return ofnode_read_bytes(dev_ofnode(dev), propname, buffer, size);
+}
+
int dev_read_u32(struct udevice *dev, const char *propname, u32 *outp)
{
return ofnode_read_u32(dev_ofnode(dev), propname, outp);
diff --git a/include/dm/of_access.h b/include/dm/of_access.h
index 13fedb7cf5e6..fc6a86959b23 100644
--- a/include/dm/of_access.h
+++ b/include/dm/of_access.h
@@ -218,6 +218,21 @@ struct device_node *of_find_node_by_prop_value(struct
device_node *from,
*/
struct device_node *of_find_node_by_phandle(phandle handle);
+/**
+ * of_read_bytes() - Find and read an array of bytes from a property
+ *
+ * Search for a property in a device node and read an array of bytes from it.
+ *
+ * @np: device node from which the property is to be read
+ * @propname: name of the property to be read
+ * @buffer: buffer to read the property value into
+ * @size: number of bytes to read
+ *
+ * @return 0 on success, or a negative error-code on failure.
+ */
+int of_read_bytes(const struct device_node *np, const char *propname,
+ u8 *buffer, int size);
+
/**
* of_read_u32() - Find and read a 32-bit integer from a property
*
diff --git a/include/dm/ofnode.h b/include/dm/ofnode.h
index d206ee2caab7..5158296dfd96 100644
--- a/include/dm/ofnode.h
+++ b/include/dm/ofnode.h
@@ -192,6 +192,17 @@ static inline ofnode ofnode_null(void)
return node;
}
+/**
+ * ofnode_read_bytes() - Read an array of bytes from a property
+ *
+ * @node: valid node reference to read property from
+ * @propname: name of the property to read from
+ * @buffer: buffer to read the value into
+ * @size: size of @buffer
+ * @return 0 on success, or a negative error code on failure
+ */
+int ofnode_read_bytes(ofnode node, const char *propname, u8 *buffer, int size);
+
/**
* ofnode_read_u32() - Read a 32-bit integer from a property
*
diff --git a/include/dm/read.h b/include/dm/read.h
index 60b727cbd821..cb9776b39721 100644
--- a/include/dm/read.h
+++ b/include/dm/read.h
@@ -44,6 +44,18 @@ static inline bool dev_of_valid(struct udevice *dev)
}
#ifndef CONFIG_DM_DEV_READ_INLINE
+/**
+ * dev_read_bytes() - read an array of bytes from a device's DT property
+ *
+ * @dev: device to read DT property from
+ * @propname: name of the property to read from
+ * @buffer: buffer to read the value into
+ * @size: size of @buffer
+ * @return 0 on success, or a negative error code on failure
+ */
+int dev_read_bytes(struct udevice *dev, const char *propname, u8 *buffer,
+
