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rtc: pcf85063: do not register a RTC device if chip is not present 

Add a sanity check to see if chip is present. If we can not communicate
with the chip there is no point in registering a RTC device.

Signed-off-by: Mirza Krak <mirza.krak@hostmobility.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
This commit is contained in:
Mirza Krak 2016-10-17 15:53:31 +02:00 committed by Alexandre Belloni
parent aaa6f6acaa
commit c18b4c52c7
1 changed files with 7 additions and 0 deletions
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7
drivers/rtc/rtc-pcf85063.c
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@ -191,12 +191,19 @@ static int pcf85063_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct rtc_device *rtc;
int err;
dev_dbg(&client->dev, "%s\n", __func__);
if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
return -ENODEV;
err = i2c_smbus_read_byte_data(client, PCF85063_REG_CTRL1);
if (err < 0) {
dev_err(&client->dev, "RTC chip is not present\n");
return err;
}
rtc = devm_rtc_device_register(&client->dev,
pcf85063_driver.driver.name,
&pcf85063_rtc_ops, THIS_MODULE);