[PATCH v4 2/9] dt-bindings: i2c: add bindings for i2c analog and digital filter

Eugen.Hristev
2019-09-02T10:12:06Z

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 <eugen.hristev@microchip.com>
---
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..8dbff67 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
specification.

+- i2c-analog-filter
+ Enable analog filter for i2c lines.
+
+- i2c-digital-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-analog-filtr or i2c-digital-filtr). This width is specified
+ in nanoseconds.
+
- interrupts
interrupts used by the device.

--
2.7.4