Preserve chip operation mode if no mode is specified via devicetree. This enables operation when chip configuration is done by BIOS/ROMMON.
Signed-off-by: Alexander Koch <[email protected]> Acked-by: Michael Hornung <[email protected]> --- drivers/hwmon/adc128d818.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/hwmon/adc128d818.c b/drivers/hwmon/adc128d818.c index 0502af963f73..bbe3a5c5b3f5 100644 --- a/drivers/hwmon/adc128d818.c +++ b/drivers/hwmon/adc128d818.c @@ -491,7 +491,7 @@ static int adc128_probe(struct i2c_client *client, data->vref = 2560; /* 2.56V, in mV */ } - /* Operation mode is optional and defaults to mode 0 */ + /* Operation mode is optional. If unspecified, keep current mode */ if (of_property_read_u8(dev->of_node, "ti,mode", &data->mode) == 0) { if (data->mode > 3) { dev_err(dev, "invalid operation mode %d\n", @@ -500,7 +500,10 @@ static int adc128_probe(struct i2c_client *client, goto error; } } else { - data->mode = 0; + err = i2c_smbus_read_byte_data(client, ADC128_REG_CONFIG_ADV); + if (err < 0) + goto error; + data->mode = (err >> 1) & ADC128_REG_MASK; } data->client = client; -- 2.11.0
