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 <bgolaszew...@baylibre.com>
Signed-off-by: Baruch Siach <bar...@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;
}
--
2.20.1
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