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 4/6 v3] iio: magn: ak8975: allow a delay after enabling regulators
Date: Wed, 29 Jun 2016 14:08:36 +0200 [thread overview]
Message-ID: <1467202118-10386-5-git-send-email-linus.walleij@linaro.org> (raw)
In-Reply-To: <1467202118-10386-1-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>
---
ChangeLog v2->v3:
- Rebase
ChangeLog v1->v2:
- No changes.
---
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 f72f51d1f3f5..c67cf3a6128d 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:[~2016-06-29 12:08 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-06-29 12:08 [PATCH 0/7] Fix regulators and PM for AK8975 v3 Linus Walleij
2016-06-29 12:08 ` [PATCH 1/6 v3] iio: magn: ak8975: fix regulator usage Linus Walleij
2016-06-30 19:33 ` Jonathan Cameron
2016-06-29 12:08 ` [PATCH 2/6 v3] iio: magn: ak8975: add Vid regulator Linus Walleij
2016-06-30 19:35 ` Jonathan Cameron
2016-06-29 12:08 ` [PATCH 3/6 v3] iio: magn: ak8975: refactor regulator handlers Linus Walleij
2016-06-30 19:35 ` Jonathan Cameron
2016-06-29 12:08 ` Linus Walleij [this message]
2016-06-30 19:36 ` [PATCH 4/6 v3] iio: magn: ak8975: allow a delay after enabling regulators Jonathan Cameron
2016-06-29 12:08 ` [PATCH 5/6 v3] iio: magn: ak8975: make sure to power down at remove() Linus Walleij
2016-06-29 16:33 ` Ulf Hansson
2016-06-30 19:37 ` Jonathan Cameron
2016-06-29 12:08 ` [PATCH 6/6 v3] iio: magn: ak8975: deploy runtime and system PM Linus Walleij
2016-06-29 16:35 ` Ulf Hansson
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