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-Qualcomm Technologies HIDMA Management interface
-
-Qualcomm Technologies HIDMA is a high speed DMA device. It only supports
-memcpy and memset capabilities. It has been designed for virtualized
-environments.
-
-Each HIDMA HW instance consists of multiple DMA channels. These channels
-share the same bandwidth. The bandwidth utilization can be partitioned
-among channels based on the priority and weight assignments.
-
-There are only two priority levels and 15 weigh assignments possible.
-
-Other parameters here determine how much of the system bus this HIDMA
-instance can use like maximum read/write request and number of bytes to
-read/write in a single burst.
-
-Main node required properties:
-- compatible: "qcom,hidma-mgmt-1.0";
-- reg: Address range for DMA device
-- dma-channels: Number of channels supported by this DMA controller.
-- max-write-burst-bytes: Maximum write burst in bytes that HIDMA can
-  occupy the bus for in a single transaction. A memcpy requested is
-  fragmented to multiples of this amount. This parameter is used while
-  writing into destination memory. Setting this value incorrectly can
-  starve other peripherals in the system.
-- max-read-burst-bytes: Maximum read burst in bytes that HIDMA can
-  occupy the bus for in a single transaction. A memcpy request is
-  fragmented to multiples of this amount. This parameter is used while
-  reading the source memory. Setting this value incorrectly can starve
-  other peripherals in the system.
-- max-write-transactions: This value is how many times a write burst is
-  applied back to back while writing to the destination before yielding
-  the bus.
-- max-read-transactions: This value is how many times a read burst is
-  applied back to back while reading the source before yielding the bus.
-- channel-reset-timeout-cycles: Channel reset timeout in cycles for this SOC.
-  Once a reset is applied to the HW, HW starts a timer for reset operation
-  to confirm. If reset is not completed within this time, HW reports reset
-  failure.
-
-Sub-nodes:
-
-HIDMA has one or more DMA channels that are used to move data from one
-memory location to another.
-
-When the OS is not in control of the management interface (i.e. it's a guest),
-the channel nodes appear on their own, not under a management node.
-
-Required properties:
-- compatible: must contain "qcom,hidma-1.0" for initial HW or
-  "qcom,hidma-1.1"/"qcom,hidma-1.2" for MSI capable HW.
-- reg: Addresses for the transfer and event channel
-- interrupts: Should contain the event interrupt
-- desc-count: Number of asynchronous requests this channel can handle
-- iommus: required a iommu node
-
-Optional properties for MSI:
-- msi-parent : See the generic MSI binding described in
- devicetree/bindings/interrupt-controller/msi.txt for a description of the
- msi-parent property.
-
-Example:
-
-Hypervisor OS configuration:
-
-	hidma-mgmt@f9984000 = {
-		compatible = "qcom,hidma-mgmt-1.0";
-		reg = <0xf9984000 0x15000>;
-		dma-channels = <6>;
-		max-write-burst-bytes = <1024>;
-		max-read-burst-bytes = <1024>;
-		max-write-transactions = <31>;
-		max-read-transactions = <31>;
-		channel-reset-timeout-cycles = <0x500>;
-
-		hidma_24: dma-controller@5c050000 {
-			compatible = "qcom,hidma-1.0";
-			reg = <0 0x5c050000 0x0 0x1000>,
-			      <0 0x5c0b0000 0x0 0x1000>;
-			interrupts = <0 389 0>;
-			desc-count = <10>;
-			iommus = <&system_mmu>;
-		};
-	};
-
-Guest OS configuration:
-
-	hidma_24: dma-controller@5c050000 {
-		compatible = "qcom,hidma-1.0";
-		reg = <0 0x5c050000 0x0 0x1000>,
-		      <0 0x5c0b0000 0x0 0x1000>;
-		interrupts = <0 389 0>;
-		desc-count = <10>;
-		iommus = <&system_mmu>;
-	};