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Subject[PATCH v3 2/9] dt-bindings: i2c: add bindings for i2c analog and digital filter
From: Eugen Hristev <>

Some i2c controllers have a built-in digital or analog filter.
This is specifically required depending on the hardware PCB/board.
Some controllers also allow specifying the maximum width of the
spikes that can be filtered. The width length can be specified in nanoseconds.

Signed-off-by: Eugen Hristev <>
Documentation/devicetree/bindings/i2c/i2c.txt | 11 +++++++++++
1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/i2c/i2c.txt b/Documentation/devicetree/bindings/i2c/i2c.txt
index 44efafd..a2d31aa 100644
--- a/Documentation/devicetree/bindings/i2c/i2c.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c.txt
@@ -55,6 +55,17 @@ wants to support one of the below features, it should adapt the bindings below.
Number of nanoseconds the SDA signal takes to fall; t(f) in the I2C

+- i2c-ana-filter
+ Enable analog filter for i2c lines.
+- i2c-dig-filter
+ Enable digital filter for i2c lines.
+- i2c-filter-width-ns
+ Width of spikes which can be filtered by either digital or analog
+ filters (i2c-ana-filtr or i2c-dig-filtr). This width is specified
+ in nanoseconds.
- interrupts
interrupts used by the device.

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