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misc: i2c_eeprom: verify that the chip is functional at probe() 

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>

hs: fixed style check prefer kernel type 'u8' over 'uint8_t'
This commit is contained in:
Baruch Siach 2019-08-05 09:03:30 +03:00 committed by Heiko Schocher
parent d7d864017d
commit 5ae84860b0
1 changed files with 8 additions and 0 deletions
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8
drivers/misc/i2c_eeprom.c
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@ -84,6 +84,14 @@ static int i2c_eeprom_std_ofdata_to_platdata(struct udevice *dev)
static int i2c_eeprom_std_probe(struct udevice *dev) static int i2c_eeprom_std_probe(struct udevice *dev)
{ {
u8 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; return 0;
} }