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| author | Simon Guinot <simon.guinot@sequanux.org> | 2015-02-25 18:58:19 +0100 |
|---|---|---|
| committer | Guenter Roeck <linux@roeck-us.net> | 2015-03-09 09:59:36 -0700 |
| commit | 73ef85f42da2df8b567fea109c67ed53db937bcc (patch) | |
| tree | 0b72ae38e8aeb5d432827e753b690438bae1244d /Documentation/devicetree/bindings/gpio | |
| parent | 6552f327cab8eb6c773ba4f702cf6a371d1dc467 (diff) | |
| download | lwn-73ef85f42da2df8b567fea109c67ed53db937bcc.tar.gz lwn-73ef85f42da2df8b567fea109c67ed53db937bcc.zip | |
hwmon: (gpio-fan) allow to use alarm support alone from DT
On some boards, such as the LaCie 2Big Network v2 or 2Big NAS (based on
Marvell Kirkwood SoCs), an I2C fan controller is used but the alarm
signal is wired to a separate GPIO. Unfortunately, the gpio-fan driver
can't be used to handle GPIO alarm alone from DT: an error is returned
if the "gpios" DT property is missing.
This patch allows to use the gpio-fan driver even if the "alarm-gpios"
DT property is defined alone.
Signed-off-by: Simon Guinot <simon.guinot@sequanux.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Diffstat (limited to 'Documentation/devicetree/bindings/gpio')
| -rw-r--r-- | Documentation/devicetree/bindings/gpio/gpio-fan.txt | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-fan.txt b/Documentation/devicetree/bindings/gpio/gpio-fan.txt index 2dd457a3469a..f996d428f132 100644 --- a/Documentation/devicetree/bindings/gpio/gpio-fan.txt +++ b/Documentation/devicetree/bindings/gpio/gpio-fan.txt @@ -2,16 +2,18 @@ Bindings for fan connected to GPIO lines Required properties: - compatible : "gpio-fan" + +Optional properties: - gpios: Specifies the pins that map to bits in the control value, ordered MSB-->LSB. - gpio-fan,speed-map: A mapping of possible fan RPM speeds and the control value that should be set to achieve them. This array must have the RPM values in ascending order. - -Optional properties: - alarm-gpios: This pin going active indicates something is wrong with the fan, and a udev event will be fired. +Note: At least one the "gpios" or "alarm-gpios" properties must be set. + Examples: gpio_fan { |