diff options
| author | Liu Gang <Gang.Liu@nxp.com> | 2016-06-07 09:55:45 +0300 |
|---|---|---|
| committer | Shawn Guo <shawnguo@kernel.org> | 2016-06-16 03:42:01 +0300 |
| commit | 2f082b13f2ef89548d5629d9bbf8795ed246a0ec (patch) | |
| tree | cd82f1f1d3192415523db46381b55ad078d1d902 /Documentation/devicetree/bindings/pci/layerscape-pci.txt | |
| parent | bf26225fc622d96f5ec0f40dca8a809d9685a604 (diff) | |
| download | linux-2f082b13f2ef89548d5629d9bbf8795ed246a0ec.tar.xz | |
bindings: PCI: layerscape: Add 'dma-coherent' property
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@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'Documentation/devicetree/bindings/pci/layerscape-pci.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/pci/layerscape-pci.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pci/layerscape-pci.txt b/Documentation/devicetree/bindings/pci/layerscape-pci.txt index ef683b2fd23a..41e9f55a1467 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 */ |