rockchip: tinker: set ethaddr in late init

Set ethernet mac address in late init for Tinker Board,
prevents getting a random mac address each boot.

Read mac address from eeprom, first 6 bytes from m24c08@50.
Same as /etc/init.d/rockchip.sh on Tinker OS.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/arm/dts/rk3288-tinker.dts

@@ -67,3 +67,10 @@
 &gpio8 {
 	u-boot,dm-pre-reloc;
 };
+
+&i2c2 {
+    m24c08@50 {
+        compatible = "at,24c08", "i2c-eeprom";
+        reg = <0x50>;
+    };
+};

board/rockchip/tinker_rk3288/tinker-rk3288.c

@@ -5,3 +5,31 @@
  */
 
 #include <common.h>
+#include <dm.h>
+#include <i2c_eeprom.h>
+#include <netdev.h>
+
+static int get_ethaddr_from_eeprom(u8 *addr)
+{
+	int ret;
+	struct udevice *dev;
+
+	ret = uclass_first_device_err(UCLASS_I2C_EEPROM, &dev);
+	if (ret)
+		return ret;
+
+	return i2c_eeprom_read(dev, 0, addr, 6);
+}
+
+int rk_board_late_init(void)
+{
+	u8 ethaddr[6];
+
+	if (get_ethaddr_from_eeprom(ethaddr))
+		return 0;
+
+	if (is_valid_ethaddr(ethaddr))
+		eth_setenv_enetaddr("ethaddr", ethaddr);
+
+	return 0;
+}

configs/tinker-rk3288_defconfig

@@ -11,6 +11,7 @@ CONFIG_CONSOLE_MUX=y
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN=0x2000
+CONFIG_SPL_I2C_SUPPORT=y
 # CONFIG_CMD_IMLS is not set
 CONFIG_CMD_GPT=y
 CONFIG_CMD_MMC=y
@@ -39,6 +40,8 @@ CONFIG_CLK=y
 CONFIG_SPL_CLK=y
 CONFIG_ROCKCHIP_GPIO=y
 CONFIG_SYS_I2C_ROCKCHIP=y
+CONFIG_MISC=y
+CONFIG_I2C_EEPROM=y
 CONFIG_MMC_DW=y
 CONFIG_MMC_DW_ROCKCHIP=y
 CONFIG_DM_ETH=y