generic: write back netdev MAC-address to device-tree

The label-mac logic relies on the mac-address property of a netdev
devices of-node. However, the mac address can also be stored as a
different property or read from e.g. an mtd device.

Create this node when reading a mac-address from OF if it does not
already exist and copy the mac-address used for the device to this
property. This way, the MAC address can be accessed using procfs.

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

target/linux/generic/pending-5.10/681-NET-add-mtd-mac-address-support-to-of_get_mac_addres.patch

@@ -34,13 +34,14 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
  {
  	struct property *pp = of_find_property(np, name, NULL);
  
-@@ -78,6 +79,70 @@ static const void *of_get_mac_addr_nvmem
+@@ -78,6 +79,55 @@ static const void *of_get_mac_addr_nvmem
  	return mac;
  }
  
 +static const void *of_get_mac_address_mtd(struct device_node *np)
 +{
 +#ifdef CONFIG_MTD
++	struct platform_device *pdev = of_find_device_by_node(np);
 +	struct device_node *mtd_np = NULL;
 +	struct property *prop;
 +	size_t retlen;
@@ -77,46 +78,30 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
 +	if (!is_valid_ether_addr(mac))
 +		return NULL;
 +
-+	addr = of_get_mac_addr(np, "mac-address");
-+	if (addr) {
-+		memcpy(addr, mac, ETH_ALEN);
-+		return addr;
-+	}
++	addr = devm_kmemdup(&pdev->dev, mac, ETH_ALEN, GFP_KERNEL);
++	if (!addr)
++		return ERR_PTR(-ENOMEM);
 +
-+	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
-+	if (!prop)
-+		return NULL;
-+
-+	prop->name = "mac-address";
-+	prop->length = ETH_ALEN;
-+	prop->value = kmemdup(mac, ETH_ALEN, GFP_KERNEL);
-+	if (!prop->value || of_add_property(np, prop))
-+		goto free;
-+
-+	return prop->value;
-+free:
-+	kfree(prop->value);
-+	kfree(prop);
++	return addr;
 +#endif
-+	return NULL;
 +}
 +
 +
  /**
   * Search the device tree for the best MAC address to use.  'mac-address' is
   * checked first, because that is supposed to contain to "most recent" MAC
-@@ -98,6 +163,10 @@ static const void *of_get_mac_addr_nvmem
+@@ -98,6 +148,10 @@ static const void *of_get_mac_addr_nvmem
   * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
   * but is all zeros.
   *
 + *
 + * If a mtd-mac-address property exists, try to fetch the MAC address from the
-+ * specified mtd device, and store it as a 'mac-address' property
++ * specified mtd device.
 + *
   * Return: Will be a valid pointer on success and ERR_PTR in case of error.
  */
  const void *of_get_mac_address(struct device_node *np)
-@@ -116,6 +185,10 @@ const void *of_get_mac_address(struct de
+@@ -116,6 +170,10 @@ const void *of_get_mac_address(struct de
  	if (addr)
  		return addr;
  

target/linux/generic/pending-5.10/682-of_net-add-mac-address-increment-support.patch

@@ -64,10 +64,10 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
 +static void *of_get_mac_address_mtd(struct device_node *np)
  {
  #ifdef CONFIG_MTD
- 	struct device_node *mtd_np = NULL;
-@@ -167,28 +172,54 @@ free:
+ 	struct platform_device *pdev = of_find_device_by_node(np);
+@@ -152,28 +157,54 @@ static const void *of_get_mac_address_mt
   * If a mtd-mac-address property exists, try to fetch the MAC address from the
-  * specified mtd device, and store it as a 'mac-address' property
+  * specified mtd device.
   *
 + * DT can tell the system to increment the mac-address after is extracted by
 + * using:

target/linux/generic/pending-5.10/683-of_net-add-mac-address-to-of-tree.patch

@@ -0,0 +1,44 @@
+--- a/drivers/of/of_net.c
++++ b/drivers/of/of_net.c
+@@ -132,6 +132,33 @@ static void *of_get_mac_address_mtd(stru
+ #endif
+ }
+ 
++static int of_add_mac_address(struct device_node *np, u8* addr)
++{
++	struct property *prop;
++	u8 *np_addr;
++
++	np_addr = of_get_mac_addr(np, "mac-address");
++	if (np_addr) {
++		memcpy(np_addr, addr, ETH_ALEN);
++		return 0;
++	}
++
++	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
++	if (!prop)
++		return 0;
++
++	prop->name = "mac-address";
++	prop->length = ETH_ALEN;
++	prop->value = kmemdup(addr, ETH_ALEN, GFP_KERNEL);
++	if (!prop->value || of_add_property(np, prop))
++		goto free;
++
++	return 0;
++free:
++	kfree(prop->value);
++	kfree(prop);
++	return -ENOMEM;
++}
+ 
+ /**
+  * Search the device tree for the best MAC address to use.  'mac-address' is
+@@ -205,6 +232,7 @@ found:
+ 	if (!of_property_read_u32(np, "mac-address-increment", &mac_inc))
+ 		addr[inc_idx] += mac_inc;
+ 
++	of_add_mac_address(np, addr);
+ 	return addr;
+ }
+ EXPORT_SYMBOL(of_get_mac_address);

target/linux/generic/pending-5.4/681-NET-add-mtd-mac-address-support-to-of_get_mac_addres.patch

@@ -34,13 +34,14 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
  {
  	struct property *pp = of_find_property(np, name, NULL);
  
-@@ -72,6 +73,70 @@ static const void *of_get_mac_addr_nvmem
+@@ -72,6 +73,55 @@ static const void *of_get_mac_addr_nvmem
  	return mac;
  }
  
 +static const void *of_get_mac_address_mtd(struct device_node *np)
 +{
 +#ifdef CONFIG_MTD
++	struct platform_device *pdev = of_find_device_by_node(np);
 +	struct device_node *mtd_np = NULL;
 +	struct property *prop;
 +	size_t retlen;
@@ -77,46 +78,30 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
 +	if (!is_valid_ether_addr(mac))
 +		return NULL;
 +
-+	addr = of_get_mac_addr(np, "mac-address");
-+	if (addr) {
-+		memcpy(addr, mac, ETH_ALEN);
-+		return addr;
-+	}
++	addr = devm_kmemdup(&pdev->dev, mac, ETH_ALEN, GFP_KERNEL);
++	if (!addr)
++		return ERR_PTR(-ENOMEM);
 +
-+	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
-+	if (!prop)
-+		return NULL;
-+
-+	prop->name = "mac-address";
-+	prop->length = ETH_ALEN;
-+	prop->value = kmemdup(mac, ETH_ALEN, GFP_KERNEL);
-+	if (!prop->value || of_add_property(np, prop))
-+		goto free;
-+
-+	return prop->value;
-+free:
-+	kfree(prop->value);
-+	kfree(prop);
++	return addr;
 +#endif
-+	return NULL;
 +}
 +
 +
  /**
   * Search the device tree for the best MAC address to use.  'mac-address' is
   * checked first, because that is supposed to contain to "most recent" MAC
-@@ -92,6 +157,10 @@ static const void *of_get_mac_addr_nvmem
+@@ -92,6 +142,10 @@ static const void *of_get_mac_addr_nvmem
   * this case, the real MAC is in 'local-mac-address', and 'mac-address' exists
   * but is all zeros.
   *
 + *
 + * If a mtd-mac-address property exists, try to fetch the MAC address from the
-+ * specified mtd device, and store it as a 'mac-address' property
++ * specified mtd device.
 + *
   * Return: Will be a valid pointer on success and ERR_PTR in case of error.
  */
  const void *of_get_mac_address(struct device_node *np)
-@@ -110,6 +179,10 @@ const void *of_get_mac_address(struct de
+@@ -110,6 +164,10 @@ const void *of_get_mac_address(struct de
  	if (addr)
  		return addr;
  

target/linux/generic/pending-5.4/682-of_net-add-mac-address-increment-support.patch

@@ -64,10 +64,10 @@ Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
 +static void *of_get_mac_address_mtd(struct device_node *np)
  {
  #ifdef CONFIG_MTD
- 	struct device_node *mtd_np = NULL;
-@@ -161,28 +166,54 @@ free:
+ 	struct platform_device *pdev = of_find_device_by_node(np);
+@@ -146,28 +151,54 @@ static const void *of_get_mac_address_mt
   * If a mtd-mac-address property exists, try to fetch the MAC address from the
-  * specified mtd device, and store it as a 'mac-address' property
+  * specified mtd device.
   *
 + * DT can tell the system to increment the mac-address after is extracted by
 + * using:

target/linux/generic/pending-5.4/683-of_net-add-mac-address-to-of-tree.patch

@@ -0,0 +1,44 @@
+--- a/drivers/of/of_net.c
++++ b/drivers/of/of_net.c
+@@ -125,6 +125,33 @@ static void *of_get_mac_address_mtd(stru
+ #endif
+ }
+ 
++static int of_add_mac_address(struct device_node *np, u8* addr)
++{
++	struct property *prop;
++	u8 *np_addr;
++
++	np_addr = of_get_mac_addr(np, "mac-address");
++	if (np_addr) {
++		memcpy(np_addr, addr, ETH_ALEN);
++		return 0;
++	}
++
++	prop = kzalloc(sizeof(*prop), GFP_KERNEL);
++	if (!prop)
++		return 0;
++
++	prop->name = "mac-address";
++	prop->length = ETH_ALEN;
++	prop->value = kmemdup(addr, ETH_ALEN, GFP_KERNEL);
++	if (!prop->value || of_add_property(np, prop))
++		goto free;
++
++	return 0;
++free:
++	kfree(prop->value);
++	kfree(prop);
++	return -ENOMEM;
++}
+ 
+ /**
+  * Search the device tree for the best MAC address to use.  'mac-address' is
+@@ -198,6 +225,7 @@ found:
+ 	if (!of_property_read_u32(np, "mac-address-increment", &mac_inc))
+ 		addr[inc_idx] += mac_inc;
+ 
++	of_add_mac_address(np, addr);
+ 	return addr;
+ }
+ EXPORT_SYMBOL(of_get_mac_address);