FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/iommu/rockchip,iommu.txt

     Rockchip IOMMU
     ==============
     
     A Rockchip DRM iommu translates io virtual addresses to physical addresses for
     its master device.  Each slave device is bound to a single master device, and
     shares its clocks, power domain and irq.
     
     Required properties:
     - compatible      : Should be "rockchip,iommu"
    - reg             : Address space for the configuration registers
    - interrupts      : Interrupt specifier for the IOMMU instance
    - interrupt-names : Interrupt name for the IOMMU instance
    - #iommu-cells    : Should be <0>.  This indicates the iommu is a
                        "single-master" device, and needs no additional information
                        to associate with its master device.  See:
                        Documentation/devicetree/bindings/iommu/iommu.txt
    - clocks          : A list of clocks required for the IOMMU to be accessible by
                        the host CPU.
    - clock-names     : Should contain the following:
            "iface" - Main peripheral bus clock (PCLK/HCL) (required)
            "aclk"  - AXI bus clock (required)
    
    Optional properties:
    - rockchip,disable-mmu-reset : Don't use the mmu reset operation.
                                   Some mmu instances may produce unexpected results
                                   when the reset operation is used.
    
    Example:
    
            vopl_mmu: iommu@ff940300 {
                    compatible = "rockchip,iommu";
                    reg = <0xff940300 0x100>;
                    interrupts = <GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>;
                    interrupt-names = "vopl_mmu";
                    clocks = <&cru ACLK_VOP1>, <&cru HCLK_VOP1>;
                    clock-names = "aclk", "iface";
                    #iommu-cells = <0>;
            };

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