kernel/Documentation/devicetree/bindings/arm/coresight.txt

   1 * CoreSight Components:
   2
   3 CoreSight components are compliant with the ARM CoreSight architecture
   4 specification and can be connected in various topologies to suit a particular
   5 SoCs tracing needs. These trace components can generally be classified as
   6 sinks, links and sources. Trace data produced by one or more sources flows
   7 through the intermediate links connecting the source to the currently selected
   8 sink. Each CoreSight component device should use these properties to describe
   9 its hardware characteristcs.
  10
  11 * Required properties for all components *except* non-configurable replicators:
  12
  13         * compatible: These have to be supplemented with "arm,primecell" as
  14           drivers are using the AMBA bus interface.  Possible values include:
  15                 - "arm,coresight-etb10", "arm,primecell";
  16                 - "arm,coresight-tpiu", "arm,primecell";
  17                 - "arm,coresight-tmc", "arm,primecell";
  18                 - "arm,coresight-funnel", "arm,primecell";
  19                 - "arm,coresight-etm3x", "arm,primecell";
  20
  21         * reg: physical base address and length of the register
  22           set(s) of the component.
  23
  24         * clocks: the clock associated to this component.
  25
  26         * clock-names: the name of the clock as referenced by the code.
  27           Since we are using the AMBA framework, the name should be
  28           "apb_pclk".
  29
  30         * port or ports: The representation of the component's port
  31           layout using the generic DT graph presentation found in
  32           "bindings/graph.txt".
  33
  34 * Required properties for devices that don't show up on the AMBA bus, such as
  35   non-configurable replicators:
  36
  37         * compatible: Currently supported value is (note the absence of the
  38           AMBA markee):
  39                 - "arm,coresight-replicator"
  40
  41         * port or ports: same as above.
  42
  43 * Optional properties for ETM/PTMs:
  44
  45         * arm,cp14: must be present if the system accesses ETM/PTM management
  46           registers via co-processor 14.
  47
  48         * cpu: the cpu phandle this ETM/PTM is affined to. When omitted the
  49           source is considered to belong to CPU0.
  50
  51 * Optional property for TMC:
  52
  53         * arm,buffer-size: size of contiguous buffer space for TMC ETR
  54          (embedded trace router)
  55
  56
  57 Example:
  58
  59 1. Sinks
  60         etb@20010000 {
  61                 compatible = "arm,coresight-etb10", "arm,primecell";
  62                 reg = <0 0x20010000 0 0x1000>;
  63
  64                 clocks = <&oscclk6a>;
  65                 clock-names = "apb_pclk";
  66                 port {
  67                         etb_in_port: endpoint@0 {
  68                                 slave-mode;
  69                                 remote-endpoint = <&replicator_out_port0>;
  70                         };
  71                 };
  72         };
  73
  74         tpiu@20030000 {
  75                 compatible = "arm,coresight-tpiu", "arm,primecell";
  76                 reg = <0 0x20030000 0 0x1000>;
  77
  78                 clocks = <&oscclk6a>;
  79                 clock-names = "apb_pclk";
  80                 port {
  81                         tpiu_in_port: endpoint@0 {
  82                                 slave-mode;
  83                                 remote-endpoint = <&replicator_out_port1>;
  84                         };
  85                 };
  86         };
  87
  88 2. Links
  89         replicator {
  90                 /* non-configurable replicators don't show up on the
  91                  * AMBA bus.  As such no need to add "arm,primecell".
  92                  */
  93                 compatible = "arm,coresight-replicator";
  94
  95                 ports {
  96                         #address-cells = <1>;
  97                         #size-cells = <0>;
  98
  99                         /* replicator output ports */
 100                         port@0 {
 101                                 reg = <0>;
 102                                 replicator_out_port0: endpoint {
 103                                         remote-endpoint = <&etb_in_port>;
 104                                 };
 105                         };
 106
 107                         port@1 {
 108                                 reg = <1>;
 109                                 replicator_out_port1: endpoint {
 110                                         remote-endpoint = <&tpiu_in_port>;
 111                                 };
 112                         };
 113
 114                         /* replicator input port */
 115                         port@2 {
 116                                 reg = <0>;
 117                                 replicator_in_port0: endpoint {
 118                                         slave-mode;
 119                                         remote-endpoint = <&funnel_out_port0>;
 120                                 };
 121                         };
 122                 };
 123         };
 124
 125         funnel@20040000 {
 126                 compatible = "arm,coresight-funnel", "arm,primecell";
 127                 reg = <0 0x20040000 0 0x1000>;
 128
 129                 clocks = <&oscclk6a>;
 130                 clock-names = "apb_pclk";
 131                 ports {
 132                         #address-cells = <1>;
 133                         #size-cells = <0>;
 134
 135                         /* funnel output port */
 136                         port@0 {
 137                                 reg = <0>;
 138                                 funnel_out_port0: endpoint {
 139                                         remote-endpoint =
 140                                                         <&replicator_in_port0>;
 141                                 };
 142                         };
 143
 144                         /* funnel input ports */
 145                         port@1 {
 146                                 reg = <0>;
 147                                 funnel_in_port0: endpoint {
 148                                         slave-mode;
 149                                         remote-endpoint = <&ptm0_out_port>;
 150                                 };
 151                         };
 152
 153                         port@2 {
 154                                 reg = <1>;
 155                                 funnel_in_port1: endpoint {
 156                                         slave-mode;
 157                                         remote-endpoint = <&ptm1_out_port>;
 158                                 };
 159                         };
 160
 161                         port@3 {
 162                                 reg = <2>;
 163                                 funnel_in_port2: endpoint {
 164                                         slave-mode;
 165                                         remote-endpoint = <&etm0_out_port>;
 166                                 };
 167                         };
 168
 169                 };
 170         };
 171
 172 3. Sources
 173         ptm@2201c000 {
 174                 compatible = "arm,coresight-etm3x", "arm,primecell";
 175                 reg = <0 0x2201c000 0 0x1000>;
 176
 177                 cpu = <&cpu0>;
 178                 clocks = <&oscclk6a>;
 179                 clock-names = "apb_pclk";
 180                 port {
 181                         ptm0_out_port: endpoint {
 182                                 remote-endpoint = <&funnel_in_port0>;
 183                         };
 184                 };
 185         };
 186
 187         ptm@2201d000 {
 188                 compatible = "arm,coresight-etm3x", "arm,primecell";
 189                 reg = <0 0x2201d000 0 0x1000>;
 190
 191                 cpu = <&cpu1>;
 192                 clocks = <&oscclk6a>;
 193                 clock-names = "apb_pclk";
 194                 port {
 195                         ptm1_out_port: endpoint {
 196                                 remote-endpoint = <&funnel_in_port1>;
 197                         };
 198                 };
 199         };