On Thu, Apr 14, 2016 at 03:48:21PM +0530, Vignesh R wrote: > According to Data Manual(SPRS915P) of AM57x, TI QSPI controller on > DRA74(rev 1.1+)/DRA72 EVM can support up to 64MHz in MODE-0, whereas > MODE-3 is limited to 48MHz. Hence, switch to MODE-0 for better > throughput. > > Signed-off-by: Vignesh R <vigneshr@xxxxxx> > --- > Documentation/devicetree/bindings/spi/ti_qspi.txt | 7 +++++++ > arch/arm/boot/dts/dra7-evm.dts | 6 ++---- > arch/arm/boot/dts/dra72-evm.dts | 6 ++---- > 3 files changed, 11 insertions(+), 8 deletions(-) > > diff --git a/Documentation/devicetree/bindings/spi/ti_qspi.txt b/Documentation/devicetree/bindings/spi/ti_qspi.txt > index cc8304aa64ac..50b14f6b53a3 100644 > --- a/Documentation/devicetree/bindings/spi/ti_qspi.txt > +++ b/Documentation/devicetree/bindings/spi/ti_qspi.txt > @@ -19,6 +19,13 @@ Optional properties: > - syscon-chipselects: Handle to system control region contains QSPI > chipselect register and offset of that register. > > +NOTE: TI QSPI controller requires different pinmux and IODelay > +paramaters for Mode-0 and Mode-3 operations, which needs to be set up by > +the bootloader (U-Boot). Default configuration only supports Mode-0 > +operation. Hence, "spi-cpol" and "spi-cpha" DT properties cannot be > +specified in the slave nodes of TI QSPI controller without appropriate > +modification to bootloader. But these properties are properties of what the slave device supports, right? I don't see how you can change them based on the controller. Rob -- 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
