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iio: magn: ak8975: allow a delay after enabling regulators

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The datasheet actually specifies that we need to wait atleast
500us after powering on the device before trying to set mode.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Linus Walleij 2016-06-29 14:08:36 +02:00 committed by Jonathan Cameron
parent 9e6c16d989
commit b1037c1a49
1 changed files with 6 additions and 0 deletions
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6
drivers/iio/magnetometer/ak8975.c
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@ -399,6 +399,12 @@ static int ak8975_power_on(const struct ak8975_data *data)
"Failed to enable specified Vid supply\n"); "Failed to enable specified Vid supply\n");
return ret; return ret;
} }
/*
* According to the datasheet the power supply rise time i 200us
* and the minimum wait time before mode setting is 100us, in
* total 300 us. Add some margin and say minimum 500us here.
*/
usleep_range(500, 1000);
return 0; return 0;
} }