generic: add mac-address property for NVMEM mac addresses

Traversing the device-tree by referencing a network device to determine
a devices labe-mac does not work with the generic nvmem implementation,
as the userspace expects the MAC-address to be available as a
device-tree property.

The legacy mtd-mac-address implementation did create such a node. Do the
same when using the nvmem implementation to allow reading the MAC
address.

Fixes commit d284e6ef0f06 ("treewide: convert mtd-mac-address-increment*
to generic implementation")

Signed-off-by: David Bauer <mail@david-bauer.net>

diff --git a/target/linux/generic/hack-5.10/683-NET-add-mac-address-property.patch b/target/linux/generic/hack-5.10/683-NET-add-mac-address-property.patch
new file mode 100644 (file)
index 0000000..de561c5
--- /dev/null
+++ b/target/linux/generic/hack-5.10/683-NET-add-mac-address-property.patch
@@ -0,0 +1,59 @@
+From: David Bauer <mail@david-bauer.net>
+Date: Tue, 20 Jul 2021 22:00:10 +0200
+Subject: [PATCH] generic: add mac-address property for NVMEM mac addresses
+
+Traversing the device-tree by referencing a network device to determine
+a devices labe-mac does not work with the generic nvmem implementation,
+as the userspace expects the MAC-address to be available as a
+device-tree property.
+
+The legacy mtd-mac-address implementation did create such a node. Do the
+same when using the nvmem implementation to allow reading the MAC
+address.
+
+Fixes commit d284e6ef0f06 ("treewide: convert mtd-mac-address-increment*
+to generic implementation")
+
+Signed-off-by: David Bauer <mail@david-bauer.net>
+
+--- a/drivers/of/of_net.c
++++ b/drivers/of/of_net.c
+@@ -61,6 +61,7 @@ static void *of_get_mac_addr_nvmem(struc
+       void *mac;
+       u8 nvmem_mac[ETH_ALEN];
+       struct platform_device *pdev = of_find_device_by_node(np);
++      struct property *prop;
+ 
+       if (!pdev) {
+               *err = -ENODEV;
+@@ -78,10 +79,29 @@ static void *of_get_mac_addr_nvmem(struc
+       put_device(&pdev->dev);
+       if (!mac) {
+               *err = -ENOMEM;
+-              return NULL;
++              goto out_err;
++      }
++
++      prop = devm_kzalloc(&pdev->dev, sizeof(*prop), GFP_KERNEL);
++      if (!prop) {
++              *err = -ENOMEM;
++              goto out_err;
++      }
++      prop->name = "mac-address";
++      prop->length = ETH_ALEN;
++      prop->value = devm_kmemdup(&pdev->dev, mac, ETH_ALEN, GFP_KERNEL);
++      if (!prop->value || of_add_property(np, prop)) {
++              *err = -ENOMEM;
++              goto out_err;
+       }
+ 
+       return mac;
++
++out_err:
++      devm_kfree(&pdev->dev, prop->value);
++      devm_kfree(&pdev->dev, prop);
++      devm_kfree(&pdev->dev, mac);
++      return NULL;
+ }
+ 
+ static void *of_get_mac_address_mtd(struct device_node *np)

diff --git a/target/linux/generic/hack-5.4/683-NET-add-mac-address-property.patch b/target/linux/generic/hack-5.4/683-NET-add-mac-address-property.patch
new file mode 100644 (file)
index 0000000..de561c5
--- /dev/null
+++ b/target/linux/generic/hack-5.4/683-NET-add-mac-address-property.patch
@@ -0,0 +1,59 @@
+From: David Bauer <mail@david-bauer.net>
+Date: Tue, 20 Jul 2021 22:00:10 +0200
+Subject: [PATCH] generic: add mac-address property for NVMEM mac addresses
+
+Traversing the device-tree by referencing a network device to determine
+a devices labe-mac does not work with the generic nvmem implementation,
+as the userspace expects the MAC-address to be available as a
+device-tree property.
+
+The legacy mtd-mac-address implementation did create such a node. Do the
+same when using the nvmem implementation to allow reading the MAC
+address.
+
+Fixes commit d284e6ef0f06 ("treewide: convert mtd-mac-address-increment*
+to generic implementation")
+
+Signed-off-by: David Bauer <mail@david-bauer.net>
+
+--- a/drivers/of/of_net.c
++++ b/drivers/of/of_net.c
+@@ -61,6 +61,7 @@ static void *of_get_mac_addr_nvmem(struc
+       void *mac;
+       u8 nvmem_mac[ETH_ALEN];
+       struct platform_device *pdev = of_find_device_by_node(np);
++      struct property *prop;
+ 
+       if (!pdev) {
+               *err = -ENODEV;
+@@ -78,10 +79,29 @@ static void *of_get_mac_addr_nvmem(struc
+       put_device(&pdev->dev);
+       if (!mac) {
+               *err = -ENOMEM;
+-              return NULL;
++              goto out_err;
++      }
++
++      prop = devm_kzalloc(&pdev->dev, sizeof(*prop), GFP_KERNEL);
++      if (!prop) {
++              *err = -ENOMEM;
++              goto out_err;
++      }
++      prop->name = "mac-address";
++      prop->length = ETH_ALEN;
++      prop->value = devm_kmemdup(&pdev->dev, mac, ETH_ALEN, GFP_KERNEL);
++      if (!prop->value || of_add_property(np, prop)) {
++              *err = -ENOMEM;
++              goto out_err;
+       }
+ 
+       return mac;
++
++out_err:
++      devm_kfree(&pdev->dev, prop->value);
++      devm_kfree(&pdev->dev, prop);
++      devm_kfree(&pdev->dev, mac);
++      return NULL;
+ }
+ 
+ static void *of_get_mac_address_mtd(struct device_node *np)