Merging upstream version 6.7.7.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 53 insertions, 0 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-adc-mcp3564 b/Documentation/ABI/testing/sysfs-bus-iio-adc-mcp3564
new file mode 100644
index 0000000000..b168aa44b2
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-adc-mcp3564
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+What:		/sys/bus/iio/devices/iio:deviceX/boost_current_gain
+KernelVersion:	6.4
+Contact:	linux-iio@vger.kernel.org
+Description:
+		This attribute is used to set the gain of the biasing current
+		circuit of the Delta-Sigma modulator. The different BOOST
+		settings are applied to the entire modulator circuit, including
+		the voltage reference buffers.
+
+What:		/sys/bus/iio/devices/iio:deviceX/boost_current_gain_available
+KernelVersion:	6.4
+Contact:	linux-iio@vger.kernel.org
+Description:
+		Reading returns a list with the possible gain values for
+		the current biasing circuit of the Delta-Sigma modulator.
+
+What:		/sys/bus/iio/devices/iio:deviceX/auto_zeroing_mux_enable
+KernelVersion:	6.4
+Contact:	linux-iio@vger.kernel.org
+Description:
+		This attribute is used to enable the analog input multiplexer
+		auto-zeroing algorithm (the input multiplexer and the ADC
+		include an offset cancellation algorithm that cancels the offset
+		contribution of the ADC). When the offset cancellation algorithm
+		is enabled, ADC takes two conversions, one with the differential
+		input as VIN+/VIN-, one with VIN+/VIN- inverted. In this case the
+		conversion time is multiplied by two compared to the default
+		case where the algorithm is disabled. This technique allows the
+		cancellation of the ADC offset error and the achievement of
+		ultra-low offset without any digital calibration. The resulting
+		offset is the residue of the difference between the two
+		conversions, which is on the order of magnitude of the noise
+		floor. This offset is effectively canceled at every conversion,
+		so the residual offset error temperature drift is extremely low.
+		Write '1' to enable it, write '0' to disable it.
+
+What:		/sys/bus/iio/devices/iio:deviceX/auto_zeroing_ref_enable
+KernelVersion:	6.4
+Contact:	linux-iio@vger.kernel.org
+Description:
+		This attribute is used to enable the chopping algorithm for the
+		internal voltage reference buffer. This setting has no effect
+		when external voltage reference is selected.
+		Internal voltage reference buffer injects a certain quantity of
+		1/f noise into the system that can be modulated with the
+		incoming input signals and can limit the SNR performance at
+		higher Oversampling Ratio values (over 256). To overcome this
+		limitation, the buffer includes an auto-zeroing algorithm that
+		greatly reduces (cancels out) the 1/f noise and cancels the
+		offset value of the reference buffer. As a result, the SNR of
+		the system is not affected by this 1/f noise component of the
+		reference buffer, even at maximum oversampling ratio values.
+		Write '1' to enable it, write '0' to disable it.