From: Josep Orga <jorga@somdevices.com>
Date: Mon, 6 Sep 2021 13:43:14 +0000 (+0200)
Subject: imx8mm-somdevices: Read MAC from EEPROM and save it in ethaddr environment variable.
X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~35
X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=d0e6c26b570ad9d8fe4a72a63c5967b0893ce049;p=u-boot.git

imx8mm-somdevices: Read MAC from EEPROM and save it in ethaddr environment variable.

Signed-off-by: Josep Orga <jorga@somdevices.com>
---

diff --git a/arch/arm/dts/imx8mm-somdevices.dts b/arch/arm/dts/imx8mm-somdevices.dts
index 7033ae35e6..fb196e1ed9 100644
--- a/arch/arm/dts/imx8mm-somdevices.dts
+++ b/arch/arm/dts/imx8mm-somdevices.dts
@@ -146,6 +146,12 @@
 	pinctrl-1 = <&pinctrl_i2c1_gpio>;
 	scl-gpios = <&gpio5 14 GPIO_ACTIVE_HIGH>;
 	sda-gpios = <&gpio5 15 GPIO_ACTIVE_HIGH>;
+	status = "okay";
+
+	eeprom@50 {
+		compatible = "microchip,24c02";
+		reg = <0x50>;
+	};
 
 	pmic: pca9450@25 {
 		reg = <0x25>;
diff --git a/board/somdevices/imx8mm_somdevices/imx8mm_somdevices.c b/board/somdevices/imx8mm_somdevices/imx8mm_somdevices.c
index 0b6120e7c1..e6ba3012e5 100644
--- a/board/somdevices/imx8mm_somdevices/imx8mm_somdevices.c
+++ b/board/somdevices/imx8mm_somdevices/imx8mm_somdevices.c
@@ -27,6 +27,10 @@ DECLARE_GLOBAL_DATA_PTR;
 
 #define UART_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_FSEL1)
 #define WDOG_PAD_CTRL	(PAD_CTL_DSE6 | PAD_CTL_ODE | PAD_CTL_PUE | PAD_CTL_PE)
+#define EEPROM_BUS_NUM	0
+#define EEPROM_ADDR		0x50
+#define EEPROM_ADDR_LEN	1
+#define EEPROM_OFFSET	0xFA
 
 static iomux_v3_cfg_t const uart_pads[] = {
 	IMX8MM_PAD_SAI3_TXFS_UART2_RX | MUX_PAD_CTRL(UART_PAD_CTRL),
@@ -71,6 +75,41 @@ static void setup_gpmi_nand(void)
 }
 #endif
 
+int set_mac_eeprom(void)
+{
+	struct udevice *dev;
+	u8 buf[6];
+	int ret;
+
+	if (!env_get("ethaddr")) {
+		/* If ethaddr variable is not set in environment */
+		char ethaddr[18];
+		printf("Setting MAC from EEPROM\n");
+		/* Configure EEPROM: 7bit address 0x50 */
+		ret = i2c_get_chip_for_busnum(EEPROM_BUS_NUM, EEPROM_ADDR, EEPROM_ADDR_LEN, &dev);
+		if (ret) {
+			printf("Cannot find EEPROM for MAC: %d\n", ret);
+			return 0;
+		}
+		/* Reading from EEPROM */
+		if (dm_i2c_read(dev, EEPROM_OFFSET, (u8 *)&buf, sizeof(buf)) < 0) {
+			printf("i2c EEPROM for MAC read failed\n");
+			return 0;
+		}
+		sprintf(ethaddr, "%02X:%02X:%02X:%02X:%02X:%02X",
+						buf[0],
+						buf[1],
+						buf[2],
+						buf[3],
+						buf[4],
+						buf[5]);
+		/* Set ethaddr variable for ethernet */
+		env_set("ethaddr", ethaddr);
+		env_save();
+	}
+	return 0;
+}
+
 int board_early_init_f(void)
 {
 	struct wdog_regs *wdog = (struct wdog_regs *)WDOG1_BASE_ADDR;
@@ -331,6 +370,7 @@ int board_late_init(void)
 	env_set("board_name", "SOMDEVICES");
 	env_set("board_rev", "iMX8MM");
 #endif
+	set_mac_eeprom();
 	return 0;
 }