On Wed, Aug 20, 2014 at 10:34:59AM +0100, Mark Rutland wrote: > On Tue, Aug 19, 2014 at 07:34:35PM +0100, atull@xxxxxxxxxxxxxxxxxxxxx wrote: > > From: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx> > > > > Add "speed-mode" Device Tree property to select between > > standard and fast i2c mode. Previously, driver was hardwired > > as fast mode. Default to fast mode if property is not > > present. > > > > Signed-off-by: Alan Tull <atull@xxxxxxxxxxxxxxxxxxxxx> > > --- > > .../devicetree/bindings/i2c/i2c-designware.txt | 3 +++ > > 1 file changed, 3 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/i2c/i2c-designware.txt b/Documentation/devicetree/bindings/i2c/i2c-designware.txt > > index 5199b0c..0e4cd21 100644 > > --- a/Documentation/devicetree/bindings/i2c/i2c-designware.txt > > +++ b/Documentation/devicetree/bindings/i2c/i2c-designware.txt > > @@ -9,6 +9,8 @@ Required properties : > > Recommended properties : > > > > - clock-frequency : desired I2C bus clock frequency in Hz. > > + - speed-mode : 0 = standard (0 - 100Kb/s) > > + : 1 = fast (<= 400Kb/s) <== default > > This is a bit opaque. > > Is this a limit on the max bit-rate the device should operate at? > > Why not just have an optional boolean property to limit to standard > speed? I see there's a new patch doing this based on clock-frequency, so feel free to ignore this. Mark. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
