summaryrefslogtreecommitdiff
path: root/Documentation
diff options
context:
space:
mode:
authorLinus Walleij <linus.walleij@linaro.org>2016-04-14 11:45:21 +0300
committerJonathan Cameron <jic23@kernel.org>2016-04-19 21:58:13 +0300
commit0e6f6871a1591f4bb0971809c45bc91a991f1967 (patch)
tree45aa87a59f586c7aff129809ca3cc017b4d36895 /Documentation
parent97865fe41322d83dac4373fe0a0de5b1a1b318c5 (diff)
downloadlinux-0e6f6871a1591f4bb0971809c45bc91a991f1967.tar.xz
iio: st_sensors: support open drain mode
Some types of ST Sensors can be connected to the same IRQ line as other peripherals using open drain. Add a device tree binding and a sensor data property to flip the right bit in the interrupt control register to enable open drain mode on the INT line. If the line is set to be open drain, also tag on IRQF_SHARED to the IRQ flags when requesting the interrupt, as the whole point of using open drain interrupt lines is to share them with more than one peripheral (wire-or). Cc: devicetree@vger.kernel.org Cc: Giuseppe Barba <giuseppe.barba@st.com> Cc: Denis Ciocca <denis.ciocca@st.com> Acked-by: Rob Herring <rob@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/iio/st-sensors.txt4
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/iio/st-sensors.txt b/Documentation/devicetree/bindings/iio/st-sensors.txt
index 71b7bdff21cd..637e283f4a8b 100644
--- a/Documentation/devicetree/bindings/iio/st-sensors.txt
+++ b/Documentation/devicetree/bindings/iio/st-sensors.txt
@@ -16,6 +16,10 @@ Optional properties:
- st,drdy-int-pin: the pin on the package that will be used to signal
"data ready" (valid values: 1 or 2). This property is not configurable
on all sensors.
+- drive-open-drain: the interrupt/data ready line will be configured
+ as open drain, which is useful if several sensors share the same
+ interrupt line. (This binding is taken from pinctrl/pinctrl-bindings.txt)
+ This is a boolean property.
Sensors may also have applicable pin control settings, those use the
standard bindings from pinctrl/pinctrl-bindings.txt.