Read a single byte from EEPROM to verify that it is actually there.
This is equivalent to Linux kernel commit 00f0ea70d2b8 ("eeprom: at24: check if the chip is functional in probe()").
Cc: Bartosz Golaszewski bgolaszewski@baylibre.com Signed-off-by: Baruch Siach baruch@tkos.co.il --- drivers/misc/i2c_eeprom.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/misc/i2c_eeprom.c b/drivers/misc/i2c_eeprom.c index f25d0540075d..a5ca853ab057 100644 --- a/drivers/misc/i2c_eeprom.c +++ b/drivers/misc/i2c_eeprom.c @@ -84,6 +84,14 @@ static int i2c_eeprom_std_ofdata_to_platdata(struct udevice *dev)
static int i2c_eeprom_std_probe(struct udevice *dev) { + uint8_t test_byte; + int ret; + + /* Verify that the chip is functional */ + ret = i2c_eeprom_read(dev, 0, &test_byte, 1); + if (ret) + return -ENODEV; + return 0; }