Qualcomm Internet Packet Accelerator

Internet Packet Accelerator (IPA) is a programmable protocol
processor HW block. It is designed to support generic HW processing
of UL/DL IP packets for various use cases independent of radio technology.

Required properties:

IPA node:

- compatible : "qcom,ipa"
- reg: Specifies the base physical addresses and the sizes of the IPA
       registers.
- reg-names: "ipa-base" - string to identify the IPA CORE base registers.
	     "bam-base" - string to identify the IPA BAM base registers.
	     "a2-bam-base" - string to identify the A2 BAM base registers.
- interrupts: Specifies the interrupt associated with IPA.
- interrupt-names: "ipa-irq" - string to identify the IPA core interrupt.
                   "bam-irq" - string to identify the IPA BAM interrupt.
                   "a2-bam-irq" - string to identify the A2 BAM interrupt.
- qcom,ipa-hw-ver: Specifies the IPA hardware version.

IPA pipe sub nodes (A2 static pipes configurations):

-label: two labels are supported, a2-to-ipa and ipa-to-a2 which
supply static configuration for A2-IPA connection.
-qcom,src-bam-physical-address: The physical address of the source BAM
-qcom,ipa-bam-mem-type:The memory type:
                       0(Pipe memory), 1(Private memory), 2(System memory)
-qcom,src-bam-pipe-index: Source pipe index
-qcom,dst-bam-physical-address: The physical address of the
                                destination BAM
-qcom,dst-bam-pipe-index: Destination pipe index
-qcom,data-fifo-offset: Data fifo base offset
-qcom,data-fifo-size:  Data fifo size (bytes)
-qcom,descriptor-fifo-offset: Descriptor fifo base offset
-qcom,descriptor-fifo-size: Descriptor fifo size (bytes)

Optional properties:
-qcom,ipa-pipe-mem: Specifies the base physical address and the
                    size of the IPA pipe memory region.
                    Pipe memory is a feature which may be supported by the
                    target (HW platform). The Driver support using pipe
                    memory instead of system memory. In case this property
                    will not appear in the IPA DTS entry, the driver will
                    use system memory.

Example:

qcom,ipa@fd4c0000 {
	compatible = "qcom,ipa";
	reg = <0xfd4c0000 0x26000>,
	      <0xfd4c4000 0x14818>;
	      <0xfc834000 0x7000>;
	reg-names = "ipa-base", "bam-base"; "a2-bam-base";
	interrupts = <0 252 0>,
	             <0 253 0>;
	             <0 29 1>;
	interrupt-names = "ipa-irq", "bam-irq"; "a2-bam-irq";
	qcom,ipa-hw-ver = <1>;

	qcom,pipe1 {
		label = "a2-to-ipa";
		qcom,src-bam-physical-address = <0xfc834000>;
		qcom,ipa-bam-mem-type = <0>;
		qcom,src-bam-pipe-index = <1>;
		qcom,dst-bam-physical-address = <0xfd4c0000>;
		qcom,dst-bam-pipe-index = <6>;
		qcom,data-fifo-offset = <0x1000>;
		qcom,data-fifo-size = <0xd00>;
		qcom,descriptor-fifo-offset = <0x1d00>;
		qcom,descriptor-fifo-size = <0x300>;
	};

	qcom,pipe2 {
		label = "ipa-to-a2";
		qcom,src-bam-physical-address = <0xfd4c0000>;
		qcom,ipa-bam-mem-type = <0>;
		qcom,src-bam-pipe-index = <7>;
		qcom,dst-bam-physical-address = <0xfc834000>;
		qcom,dst-bam-pipe-index = <0>;
		qcom,data-fifo-offset = <0x00>;
		qcom,data-fifo-size = <0xd00>;
		qcom,descriptor-fifo-offset = <0xd00>;
		qcom,descriptor-fifo-size = <0x300>;
	};
};