From 5ae84860b0428b37063a6d7b03cae26a4e772da7 Mon Sep 17 00:00:00 2001
From: Baruch Siach <baruch@tkos.co.il>
Date: Mon, 5 Aug 2019 09:03:30 +0300
Subject: [PATCH] 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'
---
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 f25d054007..8f2349ad5a 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)
{
+ 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;
}
--
2.39.5