On Tue, Jun 07, 2016 at 02:55:45PM +0800, Liu Gang wrote: > Add 'dma-coherent' description for PCI nodes. > > The 'dma-coherent' indicates that the hardware IP block can ensure > the coherency of the data transferred from/to the IP block. This > can avoid the software cache flush/invalid actions, and improve > the performance significantly. > > The PCI IP block of ls1043a has this capability, so adding > this feature to improve the PCI performance. > > Signed-off-by: Liu Gang <Gang.Liu@xxxxxxx> > --- > Documentation/devicetree/bindings/pci/layerscape-pci.txt | 4 ++++ > 1 file changed, 4 insertions(+) Acked-by: Rob Herring <robh@xxxxxxxxxx> > > diff --git a/Documentation/devicetree/bindings/pci/layerscape-pci.txt b/Documentation/devicetree/bindings/pci/layerscape-pci.txt > index ef683b2..41e9f55 100644 > --- a/Documentation/devicetree/bindings/pci/layerscape-pci.txt > +++ b/Documentation/devicetree/bindings/pci/layerscape-pci.txt > @@ -24,6 +24,9 @@ Required properties: > The first entry must be a link to the SCFG device node > The second entry must be '0' or '1' based on physical PCIe controller index. > This is used to get SCFG PEXN registers > +- dma-coherent: Indicates that the hardware IP block can ensure the coherency > + of the data transferred from/to the IP block. This can avoid the software > + cache flush/invalid actions, and improve the performance significantly. > > Example: > > @@ -38,6 +41,7 @@ Example: > #address-cells = <3>; > #size-cells = <2>; > device_type = "pci"; > + dma-coherent; > num-lanes = <4>; > bus-range = <0x0 0xff>; > ranges = <0x81000000 0x0 0x00000000 0x40 0x00010000 0x0 0x00010000 /* downstream I/O */ > -- > 2.1.0.27.g96db324 > -- 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
