Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / iio / Documentation / sysfs-bus-iio-ad7192

diff --git a/kernel/drivers/staging/iio/Documentation/sysfs-bus-iio-ad7192 b/kernel/drivers/staging/iio/Documentation/sysfs-bus-iio-ad7192
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+What:          /sys/.../iio:deviceX/ac_excitation_en
+KernelVersion: 3.1.0
+Contact:       linux-iio@vger.kernel.org
+Description:
+               This attribute, if available, is used to enable the AC
+               excitation mode found on some converters. In ac excitation mode,
+               the polarity of the excitation voltage is reversed on
+               alternate cycles, to eliminate DC errors.
+
+What:          /sys/.../iio:deviceX/bridge_switch_en
+KernelVersion: 3.1.0
+Contact:       linux-iio@vger.kernel.org
+Description:
+               This attribute, if available, is used to close or open the
+               bridge power down switch found on some converters.
+               In bridge applications, such as strain gauges and load cells,
+               the bridge itself consumes the majority of the current in the
+               system. To minimize the current consumption of the system,
+               the bridge can be disconnected (when it is not being used
+               using the bridge_switch_en attribute.