From: Linus Walleij <linus.walleij@linaro.org>
To: Jonathan Cameron <jic23@kernel.org>, linux-iio@vger.kernel.org
Cc: Lars-Peter Clausen <lars@metafoo.de>,
Gregor Boirie <gregor.boirie@parrot.com>,
Richard Leitner <dev@g0hl1n.net>,
Krzysztof Kozlowski <k.kozlowski@samsung.com>,
Gwendal Grignou <gwendal@chromium.org>,
Linus Walleij <linus.walleij@linaro.org>
Subject: [PATCH 4/5] iio: magn: ak8975: allow a delay after enabling regulators
Date: Wed, 22 Jun 2016 00:18:17 +0200 [thread overview]
Message-ID: <1466547498-15484-5-git-send-email-linus.walleij@linaro.org> (raw)
In-Reply-To: <1466547498-15484-1-git-send-email-linus.walleij@linaro.org>
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>
---
drivers/iio/magnetometer/ak8975.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/iio/magnetometer/ak8975.c b/drivers/iio/magnetometer/ak8975.c
index 8844e6f45c8e..1c6e4157a91f 100644
--- a/drivers/iio/magnetometer/ak8975.c
+++ b/drivers/iio/magnetometer/ak8975.c
@@ -399,6 +399,12 @@ static int ak8975_power_on(const struct ak8975_data *data)
"Failed to enable specified Vid supply\n");
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;
}
--
2.4.11
next prev parent reply other threads:[~2016-06-21 22:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-21 22:18 [PATCH 0/5] fix regulators and PM for AK8975 Linus Walleij
2016-06-21 22:18 ` [PATCH 1/5] iio: magn: ak8975: fix regulator usage Linus Walleij
2016-06-22 11:53 ` Gregor Boirie
2016-06-22 15:41 ` Linus Walleij
2016-06-23 10:48 ` Mark Brown
2016-06-21 22:18 ` [PATCH 2/5] iio: magn: ak8975: add Vid regulator Linus Walleij
2016-06-21 22:18 ` [PATCH 3/5] iio: magn: ak8975: refactor regulator handlers Linus Walleij
2016-06-21 22:18 ` Linus Walleij [this message]
2016-06-21 22:18 ` [PATCH 5/5] iio: magn: ak8975: deploy runtime PM Linus Walleij
2016-06-22 9:26 ` Ulf Hansson
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