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>
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@ -24,6 +24,9 @@ Required properties:
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The first entry must be a link to the SCFG device node
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The second entry must be '0' or '1' based on physical PCIe controller index.
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This is used to get SCFG PEXN registers
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- dma-coherent: Indicates that the hardware IP block can ensure the coherency
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of the data transferred from/to the IP block. This can avoid the software
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cache flush/invalid actions, and improve the performance significantly.
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Example:
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@ -38,6 +41,7 @@ Example:
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#address-cells = <3>;
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#size-cells = <2>;
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device_type = "pci";
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dma-coherent;
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num-lanes = <4>;
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bus-range = <0x0 0xff>;
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ranges = <0x81000000 0x0 0x00000000 0x40 0x00010000 0x0 0x00010000 /* downstream I/O */
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