From: Stefan Wahren <stefan.wahren@i2se.com>
To: Kamil Debski <kamil@wypas.org>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
Jean Delvare <jdelvare@suse.com>,
Guenter Roeck <linux@roeck-us.net>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>
Cc: linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org,
Stefan Wahren <stefan.wahren@i2se.com>
Subject: [PATCH RFC 2/3] Documentation: pwm-fan: Add description for RPM support
Date: Wed, 30 Jan 2019 16:07:06 +0100 [thread overview]
Message-ID: <1548860827-29796-3-git-send-email-stefan.wahren@i2se.com> (raw)
In-Reply-To: <1548860827-29796-1-git-send-email-stefan.wahren@i2se.com>
This adds a short description for the new RPM support of the pwm-fan
driver.
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
---
Documentation/hwmon/pwm-fan | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/Documentation/hwmon/pwm-fan b/Documentation/hwmon/pwm-fan
index 18529d2..a1ba34c 100644
--- a/Documentation/hwmon/pwm-fan
+++ b/Documentation/hwmon/pwm-fan
@@ -15,3 +15,7 @@ The driver implements a simple interface for driving a fan connected to
a PWM output. It uses the generic PWM interface, thus it can be used with
a range of SoCs. The driver exposes the fan to the user space through
the hwmon's sysfs interface.
+
+The measured fan rotation speed returned via 'fan1_input' is derived
+from the sampled interrupts from the tachometer signal by assuming
+a 2 pulse-per-revolution fan.
--
2.7.4
next prev parent reply other threads:[~2019-01-30 15:08 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-30 15:07 [PATCH RFC 0/3] hwmon: pwm-fan: Add RPM support Stefan Wahren
2019-01-30 15:07 ` [PATCH RFC 1/3] dt-bindings: hwmon: Add tachometer interrupt to pwm-fan Stefan Wahren
2019-01-30 17:28 ` Guenter Roeck
2019-01-30 20:23 ` Stefan Wahren
2019-01-30 20:35 ` Guenter Roeck
2019-01-31 8:02 ` Stefan Wahren
2019-01-31 17:19 ` Guenter Roeck
2019-01-30 15:07 ` Stefan Wahren [this message]
2019-01-30 15:07 ` [PATCH RFC 3/3] hwmon: pwm-fan: Add RPM support via external interrupt Stefan Wahren
2019-01-31 17:40 ` Guenter Roeck
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