On Fri, Nov 20, 2015 at 10:25:07AM +0800, Chen Feng wrote:
> Documentation for hi6220 iommu driver.
>
> Signed-off-by: Chen Feng <puck.chen@xxxxxxxxxxxxx>
Acked-by: Rob Herring <robh@xxxxxxxxxx>
> ---
> .../bindings/iommu/hisi,hi6220-iommu.txt | 32 ++++++++++++++++++++++
> 1 file changed, 32 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/iommu/hisi,hi6220-iommu.txt
>
> diff --git a/Documentation/devicetree/bindings/iommu/hisi,hi6220-iommu.txt b/Documentation/devicetree/bindings/iommu/hisi,hi6220-iommu.txt
> new file mode 100644
> index 0000000..44f9101
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iommu/hisi,hi6220-iommu.txt
> @@ -0,0 +1,32 @@
> +Hi6220 SoC SMMU Device Driver devicetree document
> +The media system shared the same smmu IP to access DDR memory. And all
> +media IP used the same page table.
> +
> +Below binding describes the system mmu for media system in hi6220 platform
> +
> +Required properties:
> +- compatible: should contain "hisilicon,hi6220-smmu".
> +- reg: A tuple of base address and size of System MMU registers.
> +- clocks: a list of phandle + clock-specifier pairs, one for each entry
> + in clock-names.
> +- clock-names: should contain:
> + * "smmu"
> + * "media-sc"
> + * "smmu-peri"
> +- interrupts: An interrupt specifier for interrupt signal of System MMU.
> +- #iommu-cells: The iommu-cells should be 0. Because no additional information
> + needs to be encoded in the specifier.
> +
> +Examples:
> + iommu@f4210000 {
> + compatible = "hisilicon,hi6220-smmu";
> + reg = <0x0 0xf4210000 0x0 0x1000>;
> + interrupts = <GIC_SPI 113 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&sys_ctrl HI6220_MMU_CLK>,
> + <&media_ctrl HI6220_MED_MMU>,
> + <&sys_ctrl HI6220_MEDIA_PLL_SRC>;
> + clock-names = "smmu",
> + "media-sc",
> + "smmu-peri";
> + #iommu-cells = <0>;
> + };
> --
> 1.9.1
>
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