Based on kernel version 4.7.2. Page generated on 2016-08-22 22:43 EST.
1 * Freescale QUICC Engine module (QE) 2 This represents qe module that is installed on PowerQUICC II Pro. 3 4 NOTE: This is an interim binding; it should be updated to fit 5 in with the CPM binding later in this document. 6 7 Basically, it is a bus of devices, that could act more or less 8 as a complete entity (UCC, USB etc ). All of them should be siblings on 9 the "root" qe node, using the common properties from there. 10 The description below applies to the qe of MPC8360 and 11 more nodes and properties would be extended in the future. 12 13 i) Root QE device 14 15 Required properties: 16 - compatible : should be "fsl,qe"; 17 - model : precise model of the QE, Can be "QE", "CPM", or "CPM2" 18 - reg : offset and length of the device registers. 19 - bus-frequency : the clock frequency for QUICC Engine. 20 - fsl,qe-num-riscs: define how many RISC engines the QE has. 21 - fsl,qe-num-snums: define how many serial number(SNUM) the QE can use for the 22 threads. 23 24 Optional properties: 25 - fsl,firmware-phandle: 26 Usage: required only if there is no fsl,qe-firmware child node 27 Value type: <phandle> 28 Definition: Points to a firmware node (see "QE Firmware Node" below) 29 that contains the firmware that should be uploaded for this QE. 30 The compatible property for the firmware node should say, 31 "fsl,qe-firmware". 32 33 Recommended properties 34 - brg-frequency : the internal clock source frequency for baud-rate 35 generators in Hz. 36 37 Example: 38 qe@e0100000 { 39 #address-cells = <1>; 40 #size-cells = <1>; 41 #interrupt-cells = <2>; 42 compatible = "fsl,qe"; 43 ranges = <0 e0100000 00100000>; 44 reg = <e0100000 480>; 45 brg-frequency = <0>; 46 bus-frequency = <179A7B00>; 47 } 48 49 * Multi-User RAM (MURAM) 50 51 Required properties: 52 - compatible : should be "fsl,qe-muram", "fsl,cpm-muram". 53 - mode : the could be "host" or "slave". 54 - ranges : Should be defined as specified in 1) to describe the 55 translation of MURAM addresses. 56 - data-only : sub-node which defines the address area under MURAM 57 bus that can be allocated as data/parameter 58 59 Example: 60 61 muram@10000 { 62 compatible = "fsl,qe-muram", "fsl,cpm-muram"; 63 ranges = <0 00010000 0000c000>; 64 65 data-only@0{ 66 compatible = "fsl,qe-muram-data", 67 "fsl,cpm-muram-data"; 68 reg = <0 c000>; 69 }; 70 }; 71 72 * QE Firmware Node 73 74 This node defines a firmware binary that is embedded in the device tree, for 75 the purpose of passing the firmware from bootloader to the kernel, or from 76 the hypervisor to the guest. 77 78 The firmware node itself contains the firmware binary contents, a compatible 79 property, and any firmware-specific properties. The node should be placed 80 inside a QE node that needs it. Doing so eliminates the need for a 81 fsl,firmware-phandle property. Other QE nodes that need the same firmware 82 should define an fsl,firmware-phandle property that points to the firmware node 83 in the first QE node. 84 85 The fsl,firmware property can be specified in the DTS (possibly using incbin) 86 or can be inserted by the boot loader at boot time. 87 88 Required properties: 89 - compatible 90 Usage: required 91 Value type: <string> 92 Definition: A standard property. Specify a string that indicates what 93 kind of firmware it is. For QE, this should be "fsl,qe-firmware". 94 95 - fsl,firmware 96 Usage: required 97 Value type: <prop-encoded-array>, encoded as an array of bytes 98 Definition: A standard property. This property contains the firmware 99 binary "blob". 100 101 Example: 102 qe1@e0080000 { 103 compatible = "fsl,qe"; 104 qe_firmware:qe-firmware { 105 compatible = "fsl,qe-firmware"; 106 fsl,firmware = [0x70 0xcd 0x00 0x00 0x01 0x46 0x45 ...]; 107 }; 108 ... 109 }; 110 111 qe2@e0090000 { 112 compatible = "fsl,qe"; 113 fsl,firmware-phandle = <&qe_firmware>; 114 ... 115 };