This patch adds a general of_get_extended_address function. The idea is
that 802.15.4 transceivers contains an "extended-address" property like
"mac-address" property. In driver layer each driver can request such address
via calling the of_get_extended_address function and set the
perm_extended_addr attribute of a 802.15.4 phy. This is the default used
extended address of a 802.15.4 interface.
The of_get_extended_address function returns an invalid address on
error. The sense is to validate the extended afterwards by calling
ieee802154_is_valid_extended_addr then the driver can choose an other
source for default extended address like reading firmware or a random
one.
Signed-off-by: Alexander Aring <alex.aring@xxxxxxxxx>
---
drivers/of/of_net.c | 34 ++++++++++++++++++++++++++++++++++
include/linux/of_net.h | 6 ++++++
2 files changed, 40 insertions(+)
diff --git a/drivers/of/of_net.c b/drivers/of/of_net.c
index 73e1418..316048e 100644
--- a/drivers/of/of_net.c
+++ b/drivers/of/of_net.c
@@ -6,11 +6,14 @@
* Initially copied out of arch/powerpc/kernel/prom_parse.c
*/
#include <linux/etherdevice.h>
+#include <linux/ieee802154.h>
#include <linux/kernel.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/export.h>
+#include <net/mac802154.h>
+
/**
* of_get_phy_mode - Get phy mode for given device_node
* @np: Pointer to the given device_node
@@ -75,3 +78,34 @@ const void *of_get_mac_address(struct device_node *np)
return NULL;
}
EXPORT_SYMBOL(of_get_mac_address);
+
+/**
+ * Search the device tree for the best extended address to use.
+ * 'extended-address' is checked first, because that is supposed to contain
+ * to "most recent" extended address. If that isn't set, then
+ * 'local-extended-address' is checked next, because that is the default
+ * address.
+ *
+ * Returns a valid extended address on success, otherwise an invalid extended
+ * address.
+*/
+__le64 of_get_extended_address(struct device_node *np)
+{
+ struct property *pp;
+ __le64 extended_addr = cpu_to_le64(0x0000000000000000ULL);
+
+ pp = of_find_property(np, "extended-address", NULL);
+ if (pp && (pp->length == IEEE802154_EXTENDED_ADDR_LEN)) {
+ ieee802154_be64_to_le64(&extended_addr, pp->value);
+
+ if (ieee802154_is_valid_extended_addr(extended_addr))
+ return extended_addr;
+ }
+
+ pp = of_find_property(np, "local-extended-address", NULL);
+ if (pp && (pp->length == IEEE802154_EXTENDED_ADDR_LEN))
+ ieee802154_be64_to_le64(&extended_addr, pp->value);
+
+ return extended_addr;
+}
+EXPORT_SYMBOL(of_get_extended_address);
diff --git a/include/linux/of_net.h b/include/linux/of_net.h
index 34597c8..6e677ab 100644
--- a/include/linux/of_net.h
+++ b/include/linux/of_net.h
@@ -11,6 +11,7 @@
#include <linux/of.h>
extern int of_get_phy_mode(struct device_node *np);
extern const void *of_get_mac_address(struct device_node *np);
+extern __le64 of_get_extended_address(struct device_node *np);
#else
static inline int of_get_phy_mode(struct device_node *np)
{
@@ -21,6 +22,11 @@ static inline const void *of_get_mac_address(struct device_node *np)
{
return NULL;
}
+
+static inline __le64 of_get_extended_address(struct device_node *np)
+{
+ return cpu_to_le64(0x0000000000000000ULL);
+}
#endif
#endif /* __LINUX_OF_NET_H */
--
2.3.0
--
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