@@ -115,12 +115,14 @@ static int si7020_probe(struct i2c_client *client,
I2C_FUNC_SMBUS_READ_WORD_DATA))
return -EOPNOTSUPP;
- /* Reset device, loads default settings. */
- ret = i2c_smbus_write_byte(client, SI7020CMD_RESET);
- if (ret < 0)
- return ret;
- /* Wait the maximum power-up time after software reset. */
- msleep(15);
+ if (!device_property_read_bool(&client->dev, "silabs,skip-reset")) {
+ /* Reset device, loads default settings. */
+ ret = i2c_smbus_write_byte(client, SI7020CMD_RESET);
+ if (ret < 0)
+ return ret;
+ /* Wait the maximum power-up time after software reset. */
+ msleep(15);
+ }
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
I2C commands issued after the SI7020 is starting up or after reset can potentially upset the startup sequence. Therefore, the host needs to wait for the startup sequence to finish before issuing further i2c commands. This is impractical in cases where the SI7020 is on a shared bus or behind a mux, which may switch channels at any time (generating I2C traffic). Therefore, check for a device property that indicates that the driver should skip resetting the device when probing. Signed-off-by: Eddie James <eajames@linux.ibm.com> --- drivers/iio/humidity/si7020.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)