On 2019-09-02 12:12, Eugen.Hristev@xxxxxxxxxxxxx wrote: > From: Eugen Hristev <eugen.hristev@xxxxxxxxxxxxx> > > 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@xxxxxxxxxxxxx> > --- > 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 filtr -> filter (two instances) What if you want/need to have different bandwidth for the digital and analog filters? After all, this is a generic binding... Cheers, Peter > + in nanoseconds. > + > - interrupts > interrupts used by the device. > >
