[v3,1/4] board: dhelectronics: Implement common MAC address functions

diff --git a/board/dhelectronics/common/Makefile b/board/dhelectronics/common/Makefile
new file mode 100644
index 0000000000..a472ea8d51
--- /dev/null
+++ b/board/dhelectronics/common/Makefile
@@ -0,0 +1,10 @@ 
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Copyright 2022 DENX Software Engineering GmbH, Philip Oberfichtner <pro@denx.de>
+#
+
+obj-y += dh_common.o
+
+ifneq (,$(CONFIG_ARCH_MX6)$(CONFIG_ARCH_IMX8M))
+obj-y += dh_imx.o
+endif
diff --git a/board/dhelectronics/common/dh_common.c b/board/dhelectronics/common/dh_common.c
new file mode 100644
index 0000000000..67e3d59b1f
--- /dev/null
+++ b/board/dhelectronics/common/dh_common.c
@@ -0,0 +1,65 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2022 Marek Vasut <marex@denx.de>
+ * Copyright 2022 DENX Software Engineering GmbH, Philip Oberfichtner <pro@denx.de>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c_eeprom.h>
+#include <net.h>
+
+#include "dh_common.h"
+
+bool dh_mac_is_in_env(const char *env)
+{
+	unsigned char enetaddr[6];
+
+	return eth_env_get_enetaddr(env, enetaddr);
+}
+
+int dh_get_mac_from_eeprom(unsigned char *enetaddr, const char *alias)
+{
+	struct udevice *dev;
+	int ret;
+	ofnode node;
+
+	node = ofnode_path(alias);
+	if (!ofnode_valid(node)) {
+		printf("%s: ofnode for %s not found!", __func__, alias);
+		return -ENOENT;
+	}
+
+	ret = uclass_get_device_by_ofnode(UCLASS_I2C_EEPROM, node, &dev);
+	if (ret) {
+		printf("%s: Cannot find EEPROM! ret = %d\n", __func__, ret);
+		return ret;
+	}
+
+	ret = i2c_eeprom_read(dev, 0xfa, enetaddr, 0x6);
+	if (ret) {
+		printf("%s: Error reading EEPROM! ret = %d\n", __func__, ret);
+		return ret;
+	}
+
+	if (!is_valid_ethaddr(enetaddr)) {
+		printf("%s: Address read from EEPROM is invalid!\n", __func__);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+__weak int dh_setup_mac_address(void)
+{
+	unsigned char enetaddr[6];
+
+	if (dh_mac_is_in_env("ethaddr"))
+		return 0;
+
+	if (!dh_get_mac_from_eeprom(enetaddr, "eeprom0"))
+		return eth_env_set_enetaddr("ethaddr", enetaddr);
+
+	printf("%s: Unable to set mac address!\n", __func__);
+	return -ENXIO;
+}
diff --git a/board/dhelectronics/common/dh_common.h b/board/dhelectronics/common/dh_common.h
new file mode 100644
index 0000000000..2b24637d96
--- /dev/null
+++ b/board/dhelectronics/common/dh_common.h
@@ -0,0 +1,28 @@ 
+/* SPDX-License-Identifier: GPL-2.0+
+ *
+ * Copyright 2022 DENX Software Engineering GmbH, Philip Oberfichtner <pro@denx.de>
+ */
+
+/*
+ * dh_mac_is_in_env - Check if MAC address is already set
+ *
+ * @env: name of environment variable
+ * Return: true if MAC is set, false otherwise
+ */
+bool dh_mac_is_in_env(const char *env);
+
+/*
+ * dh_get_mac_from_eeprom - Get MAC address from eeprom and write it to enetaddr
+ *
+ * @enetaddr: buffer where address is to be stored
+ * @alias: alias for EEPROM device tree node
+ * Return: 0 if OK, other value on error
+ */
+int dh_get_mac_from_eeprom(unsigned char *enetaddr, const char *alias);
+
+/*
+ * dh_setup_mac_address - Try to get MAC address from various locations and write it to env
+ *
+ * Return: 0 if OK, other value on error
+ */
+int dh_setup_mac_address(void);
diff --git a/board/dhelectronics/common/dh_imx.c b/board/dhelectronics/common/dh_imx.c
new file mode 100644
index 0000000000..7f451bad59
--- /dev/null
+++ b/board/dhelectronics/common/dh_imx.c
@@ -0,0 +1,24 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2022 Marek Vasut <marex@denx.de>
+ * Copyright 2022 DENX Software Engineering GmbH, Philip Oberfichtner <pro@denx.de>
+ */
+
+#include <asm/arch/imx-regs.h>
+#include <asm/arch/sys_proto.h>
+#include <common.h>
+#include <net.h>
+#include "dh_imx.h"
+
+int dh_imx_get_mac_from_fuse(unsigned char *enetaddr)
+{
+	/*
+	 * If IIM fuses contain valid MAC address, use it.
+	 * The IIM MAC address fuses are NOT programmed by default.
+	 */
+	imx_get_mac_from_fuse(0, enetaddr);
+	if (!is_valid_ethaddr(enetaddr))
+		return -EINVAL;
+
+	return 0;
+}
diff --git a/board/dhelectronics/common/dh_imx.h b/board/dhelectronics/common/dh_imx.h
new file mode 100644
index 0000000000..284f8637fb
--- /dev/null
+++ b/board/dhelectronics/common/dh_imx.h
@@ -0,0 +1,12 @@ 
+/* SPDX-License-Identifier: GPL-2.0+
+ *
+ * Copyright 2022 DENX Software Engineering GmbH, Philip Oberfichtner <pro@denx.de>
+ */
+
+/*
+ * dh_imx_get_mac_from_fuse - Get MAC address from fuse and write it to env
+ *
+ * @enetaddr: buffer where address is to be stored
+ * Return: 0 if OK, other value on error
+ */
+int dh_imx_get_mac_from_fuse(unsigned char *enetaddr);