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imx8mm-cl-iot-gate: Retrieve the serial number from EEPROM

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The serial number is located at offset 0x14 of the EEPROM
under i2c0 bus at address 0x54.

To print the serial number in Linux:

SERNUM=$(cat /proc/device-tree/serial-number)
echo $SERNUM

Signed-off-by: Fabio Estevam <festevam@denx.de>
This commit is contained in:
Fabio Estevam
2022-04-12 13:05:38 -03:00
committed by Stefano Babic
parent 79bc9dcfa2
commit ea10bea68d
1 changed files with 50 additions and 0 deletions
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50
board/compulab/imx8mm-cl-iot-gate/imx8mm-cl-iot-gate.c
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@@ -463,6 +463,52 @@ static int setup_mac_address(void)
return 0;
}
static int read_serial_number(void)
{
unsigned char serialnumber[6];
unsigned char reversed[6];
char serial_string[12];
struct udevice *dev;
int ret, off, i;
off = fdt_path_offset(gd->fdt_blob, "eeprom0");
if (off < 0) {
printf("No eeprom0 path offset found in DT\n");
return off;
}
ret = uclass_get_device_by_of_offset(UCLASS_I2C_EEPROM, off, &dev);
if (ret) {
printf("%s: Could not find EEPROM\n", __func__);
return ret;
}
ret = i2c_set_chip_offset_len(dev, 1);
if (ret)
return ret;
ret = i2c_eeprom_read(dev, 0x14, serialnumber, sizeof(serialnumber));
if (ret) {
printf("%s: Could not read EEPROM\n", __func__);
return ret;
}
for (i = sizeof(serialnumber) - 1; i >= 0; i--)
reversed[i] = serialnumber[sizeof(serialnumber) - 1 - i];
for (i = 0; i < sizeof(reversed); i++) {
serial_string[i * 2] = (reversed[i] >> 4) & 0xf;
serial_string[i * 2 + 1] = reversed[i] & 0xf;
}
for (i = 0; i < sizeof(serial_string); i++)
serial_string[i] += '0';
env_set("serial#", serial_string);
return 0;
}
int board_late_init(void)
{
int ret;
@@ -476,5 +522,9 @@ int board_late_init(void)
if (ret < 0)
printf("Cannot set MAC address from EEPROM\n");
ret = read_serial_number();
if (ret < 0)
printf("Cannot read serial number from EEPROM\n");
return 0;
}