ipq807x: backport support for nvmem

package/qca/nss/qca-ssdk/patches/0007-SSDK-dts-fix-of_get_mac_address.patch

@@ -0,0 +1,42 @@
+From f3a7b93137c1a6a1b8010b86296242178eed5d9e Mon Sep 17 00:00:00 2001
+From: Robert Marko <robimarko@gmail.com>
+Date: Fri, 13 Aug 2021 20:03:21 +0200
+Subject: [PATCH] SSDK: dts: fix of_get_mac_address()
+
+Recently OpenWrt backported the updated of_get_mac_address()
+function which returns and error code instead.
+
+So, patch the SSDK to use it and fix the compilation error.
+
+Signed-off-by: Robert Marko <robimarko@gmail.com>
+---
+ src/init/ssdk_dts.c | 7 ++++---
+ 1 file changed, 4 insertions(+), 3 deletions(-)
+
+--- a/src/init/ssdk_dts.c
++++ b/src/init/ssdk_dts.c
+@@ -779,8 +779,9 @@ static void ssdk_dt_parse_intf_mac(void)
+ {
+ 	struct device_node *dp_node = NULL;
+ 	a_uint32_t dp = 0;
+-	a_uint8_t *maddr = NULL;
++	u8 maddr[ETH_ALEN];
+ 	char dp_name[8] = {0};
++	int ret;
+ 
+ 	for (dp = 1; dp <= SSDK_MAX_NR_ETH; dp++) {
+ 		snprintf(dp_name, sizeof(dp_name), "dp%d", dp);
+@@ -788,11 +789,11 @@ static void ssdk_dt_parse_intf_mac(void)
+ 		if (!dp_node) {
+ 			continue;
+ 		}
+-		maddr = (a_uint8_t *)of_get_mac_address(dp_node);
++		ret = of_get_mac_address(dp_node, maddr);
+ #if (LINUX_VERSION_CODE < KERNEL_VERSION(5, 0, 0))
+ 		if (maddr && is_valid_ether_addr(maddr)) {
+ #else
+-		if (!IS_ERR(maddr) && is_valid_ether_addr(maddr)) {
++		if (!ret && is_valid_ether_addr(maddr)) {
+ #endif
+ 			ssdk_dt_global.num_intf_mac++;
+ 			ether_addr_copy(ssdk_dt_global.intf_mac[dp-1].uc, maddr);