1TI Keystone DSP devices 2======================= 3 4The TI Keystone 2 family of SoCs usually have one or more (upto 8) TI DSP Core 5sub-systems that are used to offload some of the processor-intensive tasks or 6algorithms, for achieving various system level goals. 7 8These processor sub-systems usually contain additional sub-modules like L1 9and/or L2 caches/SRAMs, an Interrupt Controller, an external memory controller, 10a dedicated local power/sleep controller etc. The DSP processor core in 11Keystone 2 SoCs is usually a TMS320C66x CorePac processor. 12 13DSP Device Node: 14================ 15Each DSP Core sub-system is represented as a single DT node, and should also 16have an alias with the stem 'rproc' defined. Each node has a number of required 17or optional properties that enable the OS running on the host processor (ARM 18CorePac) to perform the device management of the remote processor and to 19communicate with the remote processor. 20 21Required properties: 22-------------------- 23The following are the mandatory properties: 24 25- compatible: Should be one of the following, 26 "ti,k2hk-dsp" for DSPs on Keystone 2 66AK2H/K SoCs 27 "ti,k2l-dsp" for DSPs on Keystone 2 66AK2L SoCs 28 "ti,k2e-dsp" for DSPs on Keystone 2 66AK2E SoCs 29 "ti,k2g-dsp" for DSPs on Keystone 2 66AK2G SoCs 30 31- reg: Should contain an entry for each value in 'reg-names'. 32 Each entry should have the memory region's start address 33 and the size of the region, the representation matching 34 the parent node's '#address-cells' and '#size-cells' values. 35 36- reg-names: Should contain strings with the following names, each 37 representing a specific internal memory region, and 38 should be defined in this order, 39 "l2sram", "l1pram", "l1dram" 40 41- ti,syscon-dev: Should be a pair of the phandle to the Keystone Device 42 State Control node, and the register offset of the DSP 43 boot address register within that node's address space. 44 45- resets: Should contain the phandle to the reset controller node 46 managing the resets for this device, and a reset 47 specifier. Please refer to either of the following reset 48 bindings for the reset argument specifier as per SoC, 49 Documentation/devicetree/bindings/reset/ti-syscon-reset.txt 50 for 66AK2HK/66AK2L/66AK2E SoCs or, 51 Documentation/devicetree/bindings/reset/ti,sci-reset.yaml 52 for 66AK2G SoCs 53 54- interrupts: Should contain an entry for each value in 'interrupt-names'. 55 Each entry should have the interrupt source number used by 56 the remote processor to the host processor. The values should 57 follow the interrupt-specifier format as dictated by the 58 'interrupt-parent' node. The purpose of each is as per the 59 description in the 'interrupt-names' property. 60 61- interrupt-names: Should contain strings with the following names, each 62 representing a specific interrupt, 63 "vring" - interrupt for virtio based IPC 64 "exception" - interrupt for exception notification 65 66- kick-gpios: Should specify the gpio device needed for the virtio IPC 67 stack. This will be used to interrupt the remote processor. 68 The gpio device to be used is as per the bindings in, 69 Documentation/devicetree/bindings/gpio/gpio-dsp-keystone.txt 70 71SoC-specific Required properties: 72--------------------------------- 73The following are mandatory properties for Keystone 2 66AK2HK, 66AK2L and 66AK2E 74SoCs only: 75 76- clocks: Should contain the device's input clock, and should be 77 defined as per the bindings in, 78 Documentation/devicetree/bindings/clock/keystone-gate.txt 79 80The following are mandatory properties for Keystone 2 66AK2G SoCs only: 81 82- power-domains: Should contain a phandle to a PM domain provider node 83 and an args specifier containing the DSP device id 84 value. This property is as per the binding, 85 Documentation/devicetree/bindings/soc/ti/sci-pm-domain.yaml 86 87Optional properties: 88-------------------- 89 90- memory-region: phandle to the reserved memory node to be associated 91 with the remoteproc device. The reserved memory node 92 can be a CMA memory node, and should be defined as 93 per the bindings in 94 Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt 95 96 97Examples: 98--------- 99 1001. 101 /* 66AK2H/K DSP aliases */ 102 aliases { 103 rproc0 = &dsp0; 104 rproc1 = &dsp1; 105 rproc2 = &dsp2; 106 rproc3 = &dsp3; 107 rproc4 = &dsp4; 108 rproc5 = &dsp5; 109 rproc6 = &dsp6; 110 rproc7 = &dsp7; 111 }; 112 113 /* 66AK2H/K DSP memory node */ 114 reserved-memory { 115 #address-cells = <2>; 116 #size-cells = <2>; 117 ranges; 118 119 dsp_common_memory: dsp-common-memory@81f800000 { 120 compatible = "shared-dma-pool"; 121 reg = <0x00000008 0x1f800000 0x00000000 0x800000>; 122 reusable; 123 }; 124 }; 125 126 /* 66AK2H/K DSP node */ 127 soc { 128 dsp0: dsp@10800000 { 129 compatible = "ti,k2hk-dsp"; 130 reg = <0x10800000 0x00100000>, 131 <0x10e00000 0x00008000>, 132 <0x10f00000 0x00008000>; 133 reg-names = "l2sram", "l1pram", "l1dram"; 134 clocks = <&clkgem0>; 135 ti,syscon-dev = <&devctrl 0x40>; 136 resets = <&pscrst 0>; 137 interrupt-parent = <&kirq0>; 138 interrupts = <0 8>; 139 interrupt-names = "vring", "exception"; 140 kick-gpios = <&dspgpio0 27 0>; 141 memory-region = <&dsp_common_memory>; 142 }; 143 144 }; 145 1462. 147 /* 66AK2G DSP alias */ 148 aliases { 149 rproc0 = &dsp0; 150 }; 151 152 /* 66AK2G DSP memory node */ 153 reserved-memory { 154 #address-cells = <2>; 155 #size-cells = <2>; 156 ranges; 157 158 dsp_common_memory: dsp-common-memory@81f800000 { 159 compatible = "shared-dma-pool"; 160 reg = <0x00000008 0x1f800000 0x00000000 0x800000>; 161 reusable; 162 }; 163 }; 164 165 /* 66AK2G DSP node */ 166 soc { 167 dsp0: dsp@10800000 { 168 compatible = "ti,k2g-dsp"; 169 reg = <0x10800000 0x00100000>, 170 <0x10e00000 0x00008000>, 171 <0x10f00000 0x00008000>; 172 reg-names = "l2sram", "l1pram", "l1dram"; 173 power-domains = <&k2g_pds 0x0046>; 174 ti,syscon-dev = <&devctrl 0x40>; 175 resets = <&k2g_reset 0x0046 0x1>; 176 interrupt-parent = <&kirq0>; 177 interrupts = <0 8>; 178 interrupt-names = "vring", "exception"; 179 kick-gpios = <&dspgpio0 27 0>; 180 memory-region = <&dsp_common_memory>; 181 }; 182 }; 183