On Tue, 09 Jun 2015, Javier Martinez Canillas wrote: > From: Alexandru M Stan <amstan@xxxxxxxxxxxx> > > Some ECs need a little time for waking up before they can accept > SPI data at a high speed. Add a "google,cros-ec-spi-pre-delay" > property to the DT binding to configure this. > > If this property isn't set, then no delay will be added. However, > if set it will cause a delay equal to the value passed to it to > be inserted at the beginning of a transaction. > > Signed-off-by: Alexandru M Stan <amstan@xxxxxxxxxxxx> > Reviewed-by: Doug Anderson <dianders@xxxxxxxxxxxx> > Signed-off-by: Chris Zhong <zyw@xxxxxxxxxxxxxx> > Signed-off-by: Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx> > Tested-by: Heiko Stuebner <heiko@xxxxxxxxx> > Acked-by: Lee Jones <lee.jones@xxxxxxxxxx> > Acked-by: Olof Johansson <olof@xxxxxxxxx> Applied, thanks. > --- > > Changes since v6: > - Add Olof Johansson Acked-by tag > > Changes since v5: None. > > Changes since v4: None. > > Changes since v3: > - Split DT binding and driver change as suggested by Lee Jones. > - Add tested-by tag from Heiko Stuebner > - Add acked-by tag from Lee Jones. > > Changes since v2: None > > Changes since v1: None, new patch > --- > Documentation/devicetree/bindings/mfd/cros-ec.txt | 4 ++++ > 1 file changed, 4 insertions(+) > > diff --git a/Documentation/devicetree/bindings/mfd/cros-ec.txt b/Documentation/devicetree/bindings/mfd/cros-ec.txt > index 8009c3d87f33..1777916e9e28 100644 > --- a/Documentation/devicetree/bindings/mfd/cros-ec.txt > +++ b/Documentation/devicetree/bindings/mfd/cros-ec.txt > @@ -18,6 +18,10 @@ Required properties (SPI): > - reg: SPI chip select > > Optional properties (SPI): > +- google,cros-ec-spi-pre-delay: Some implementations of the EC need a little > + time to wake up from sleep before they can receive SPI transfers at a high > + clock rate. This property specifies the delay, in usecs, between the > + assertion of the CS to the start of the first clock pulse. > - google,cros-ec-spi-msg-delay: Some implementations of the EC require some > additional processing time in order to accept new transactions. If the delay > between transactions is not long enough the EC may not be able to respond -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- 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
