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dm: i2c: Make i2c_get_chip_for_busnum() fail if the chip is not detected

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i2c_get_chip_for_busnum() really should check the presence of the chip on
the bus. Most of the users of this function assume that this is done.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
This commit is contained in:
Jean-Jacques Hiblot 2018-12-07 14:50:38 +01:00 committed by Heiko Schocher
parent 65a97e7fcf
commit f32a8007ef
1 changed files with 11 additions and 0 deletions
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11
drivers/i2c/i2c-uclass.c
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@ -347,6 +347,17 @@ int i2c_get_chip_for_busnum(int busnum, int chip_addr, uint offset_len,
debug("Cannot find I2C bus %d\n", busnum);
return ret;
}
/* detect the presence of the chip on the bus */
ret = i2c_probe_chip(bus, chip_addr, 0);
debug("%s: bus='%s', address %02x, ret=%d\n", __func__, bus->name,
chip_addr, ret);
if (ret) {
debug("Cannot detect I2C chip %02x on bus %d\n", chip_addr,
busnum);
return ret;
}
ret = i2c_get_chip(bus, chip_addr, offset_len, devp);
if (ret) {
debug("Cannot find I2C chip %02x on bus %d\n", chip_addr,