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+* Texas Instruments Keystone Navigator Queue Management SubSystem driver
+
+The QMSS (Queue Manager Sub System) found on Keystone SOCs is one of
+the main hardware sub system which forms the backbone of the Keystone
+multi-core Navigator. QMSS consist of queue managers, packed-data structure
+processors(PDSP), linking RAM, descriptor pools and infrastructure
+Packet DMA.
+The Queue Manager is a hardware module that is responsible for accelerating
+management of the packet queues. Packets are queued/de-queued by writing or
+reading descriptor address to a particular memory mapped location. The PDSPs
+perform QMSS related functions like accumulation, QoS, or event management.
+Linking RAM registers are used to link the descriptors which are stored in
+descriptor RAM. Descriptor RAM is configurable as internal or external memory.
+The QMSS driver manages the PDSP setups, linking RAM regions,
+queue pool management (allocation, push, pop and notify) and descriptor
+pool management.
+
+
+Required properties:
+- compatible	: Must be "ti,keystone-navigator-qmss";
+- clocks	: phandle to the reference clock for this device.
+- queue-range	: <start number> total range of queue numbers for the device.
+- linkram0	: <address size> for internal link ram, where size is the total
+		  link ram entries.
+- linkram1	: <address size> for external link ram, where size is the total
+		  external link ram entries. If the address is specified as "0"
+		  driver will allocate memory.
+- qmgrs         : child node describing the individual queue managers on the
+		  SoC. On keystone 1 devices there should be only one node.
+		  On keystone 2 devices there can be more than 1 node.
+  -- managed-queues	: the actual queues managed by each queue manager
+			  instance, specified as <"base queue #" "# of queues">.
+  -- reg		: Address and size of the register set for the device.
+			  Register regions should be specified in the following
+			  order
+			  - Queue Peek region.
+			  - Queue status RAM.
+			  - Queue configuration region.
+			  - Descriptor memory setup region.
+			  - Queue Management/Queue Proxy region for queue Push.
+			  - Queue Management/Queue Proxy region for queue Pop.
+- queue-pools	: child node classifying the queue ranges into pools.
+		  Queue ranges are grouped into 3 type of pools:
+		  - qpend	    : pool of qpend(interruptible) queues
+		  - general-purpose : pool of general queues, primarly used
+				      as free descriptor queues or the
+				      transmit DMA queues.
+		  - accumulator	    : pool of queues on PDSP accumulator channel
+		  Each range can have the following properties:
+  -- qrange		: number of queues to use per queue range, specified as
+			  <"base queue #" "# of queues">.
+  -- interrupts		: Optional property to specify the interrupt mapping
+			  for interruptible queues. The driver additionaly sets
+			  the interrupt affinity hint based on the cpu mask.
+  -- qalloc-by-id	: Optional property to specify that the queues in this
+			  range can only be allocated by queue id.
+  -- accumulator	: Accumulator channel specification. Any of the PDSPs in
+			  QMSS can be loaded with the accumulator firmware. The
+			  accumulator firmware’s job is to poll a select number of
+			  queues looking for descriptors that have been pushed
+			  into them. Descriptors are popped from the queue and
+			  placed in a buffer provided by the host. When the list
+			  becomes full or a programmed time period expires, the
+			  accumulator triggers an interrupt to the host to read
+			  the buffer for descriptor information. This firmware
+			  comes in 16, 32, and 48 channel builds. Each of these
+			  channels can be configured to monitor 32 contiguous
+			  queues.  Accumulator channel property is specified as:
+			  <pdsp-id, channel, entries, pacing mode, latency>
+			  pdsp-id     : QMSS PDSP running accumulator firmware
+					on which the channel has to be
+					configured
+			  channel     : Accumulator channel number
+			  entries     : Size of the accumulator descriptor list
+			  pacing mode : Interrupt pacing mode
+					0 : None, i.e interrupt on list full only
+					1 : Time delay since last interrupt
+					2 : Time delay since first new packet
+					3 : Time delay since last new packet
+			  latency     : time to delay the interrupt, specified
+					in microseconds.
+  -- multi-queue	: Optional property to specify that the channel has to
+			  monitor upto 32 queues starting at the base queue #.
+- descriptor-regions	: child node describing the memory regions for keystone
+			  navigator packet DMA descriptors. The memory for
+			  descriptors will be allocated by the driver.
+  -- id				: region number in QMSS.
+  -- region-spec		: specifies the number of descriptors in the
+				  region, specified as
+				  <"# of descriptors" "descriptor size">.
+  -- link-index			: start index, i.e. index of the first
+				  descriptor in the region.
+
+Optional properties:
+- dma-coherent	: Present if DMA operations are coherent.
+- pdsps		: child node describing the PDSP configuration.
+  -- firmware		: firmware to be loaded on the PDSP.
+  -- id			: the qmss pdsp that will run the firmware.
+  -- reg		: Address and size of the register set for the PDSP.
+			  Register regions should be specified in the following
+			  order
+			  - PDSP internal RAM region.
+			  - PDSP control/status region registers.
+			  - QMSS interrupt distributor registers.
+			  - PDSP command interface region.
+
+Example:
+
+qmss: qmss@2a40000 {
+	compatible = "ti,keystone-qmss";
+	dma-coherent;
+	#address-cells = <1>;
+	#size-cells = <1>;
+	clocks = <&chipclk13>;
+	ranges;
+	queue-range	= <0 0x4000>;
+	linkram0	= <0x100000 0x8000>;
+	linkram1	= <0x0 0x10000>;
+
+	qmgrs {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+		qmgr0 {
+			managed-queues = <0 0x2000>;
+			reg = <0x2a40000 0x20000>,
+			      <0x2a06000 0x400>,
+			      <0x2a02000 0x1000>,
+			      <0x2a03000 0x1000>,
+			      <0x23a80000 0x20000>,
+			      <0x2a80000 0x20000>;
+		};
+
+		qmgr1 {
+			managed-queues = <0x2000 0x2000>;
+			reg = <0x2a60000 0x20000>,
+			      <0x2a06400 0x400>,
+			      <0x2a04000 0x1000>,
+			      <0x2a05000 0x1000>,
+			      <0x23aa0000 0x20000>,
+			      <0x2aa0000 0x20000>;
+		};
+	};
+	queue-pools {
+		qpend {
+			qpend-0 {
+				qrange = <658 8>;
+				interrupts =<0 40 0xf04 0 41 0xf04 0 42 0xf04
+					     0 43 0xf04 0 44 0xf04 0 45 0xf04
+					     0 46 0xf04 0 47 0xf04>;
+			};
+			qpend-1 {
+				qrange = <8704 16>;
+				interrupts = <0 48 0xf04 0 49 0xf04 0 50 0xf04
+					      0 51 0xf04 0 52 0xf04 0 53 0xf04
+					      0 54 0xf04 0 55 0xf04 0 56 0xf04
+					      0 57 0xf04 0 58 0xf04 0 59 0xf04
+					      0 60 0xf04 0 61 0xf04 0 62 0xf04
+					      0 63 0xf04>;
+				qalloc-by-id;
+			};
+			qpend-2 {
+				qrange = <8720 16>;
+				interrupts = <0 64 0xf04 0 65 0xf04 0 66 0xf04
+					      0 59 0xf04 0 68 0xf04 0 69 0xf04
+					      0 70 0xf04 0 71 0xf04 0 72 0xf04
+					      0 73 0xf04 0 74 0xf04 0 75 0xf04
+					      0 76 0xf04 0 77 0xf04 0 78 0xf04
+					      0 79 0xf04>;
+			};
+		};
+		general-purpose {
+			gp-0 {
+				qrange = <4000 64>;
+			};
+			netcp-tx {
+				qrange = <640 9>;
+				qalloc-by-id;
+			};
+		};
+		accumulator {
+			acc-0 {
+				qrange = <128 32>;
+				accumulator = <0 36 16 2 50>;
+				interrupts = <0 215 0xf01>;
+				multi-queue;
+				qalloc-by-id;
+			};
+			acc-1 {
+				qrange = <160 32>;
+				accumulator = <0 37 16 2 50>;
+				interrupts = <0 216 0xf01>;
+				multi-queue;
+			};
+			acc-2 {
+				qrange = <192 32>;
+				accumulator = <0 38 16 2 50>;
+				interrupts = <0 217 0xf01>;
+				multi-queue;
+			};
+			acc-3 {
+				qrange = <224 32>;
+				accumulator = <0 39 16 2 50>;
+				interrupts = <0 218 0xf01>;
+				multi-queue;
+			};
+		};
+	};
+	descriptor-regions {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+		region-12 {
+			id = <12>;
+			region-spec = <8192 128>; /* num_desc desc_size */
+			link-index = <0x4000>;
+		};
+	};
+	pdsps {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+		pdsp0@0x2a10000 {
+			firmware = "keystone/qmss_pdsp_acc48_k2_le_1_0_0_8.fw";
+			reg = <0x2a10000 0x1000>,
+			      <0x2a0f000 0x100>,
+			      <0x2a0c000 0x3c8>,
+			      <0x2a20000 0x4000>;
+			id = <0>;
+		};
+	};
+}; /* qmss */
