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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>,
	Robin Murphy <robin.murphy@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 V3 2/3] Documentation: pwm-fan: Add description for RPM support
Date: Fri, 22 Mar 2019 09:24:02 +0100	[thread overview]
Message-ID: <1553243043-19486-3-git-send-email-stefan.wahren@i2se.com> (raw)
In-Reply-To: <1553243043-19486-1-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 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/hwmon/pwm-fan b/Documentation/hwmon/pwm-fan
index 18529d2..82fe967 100644
--- a/Documentation/hwmon/pwm-fan
+++ b/Documentation/hwmon/pwm-fan
@@ -15,3 +15,6 @@ 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 fan rotation speed returned via the optional 'fan1_input' is extrapolated
+from the sampled interrupts from the tachometer signal within 1 second.
-- 
2.7.4


  parent reply	other threads:[~2019-03-22  8:25 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-22  8:24 [PATCH V3 0/3] hwmon: pwm-fan: Add RPM support Stefan Wahren
2019-03-22  8:24 ` [PATCH V3 1/3] dt-bindings: hwmon: Add tachometer interrupt to pwm-fan Stefan Wahren
2019-03-28 18:01   ` Rob Herring
2019-03-22  8:24 ` Stefan Wahren [this message]
2019-03-22  8:24 ` [PATCH V3 3/3] hwmon: pwm-fan: Add RPM support via external interrupt Stefan Wahren
2019-03-23 15:03   ` Guenter Roeck
2019-03-29 16:02   ` Robin Murphy

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