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                 - "qcom,coresight-replicator1x", "arm,primecell";
  21
  22         * reg: physical base address and length of the register
  23           set(s) of the component.
  24
  25         * clocks: the clocks associated to this component.
  26
  27         * clock-names: the name of the clocks referenced by the code.
  28           Since we are using the AMBA framework, the name of the clock
  29           providing the interconnect should be "apb_pclk", and some
  30           coresight blocks also have an additional clock "atclk", which
  31           clocks the core of that coresight component. The latter clock
  32           is optional.
  33
  34         * port or ports: The representation of the component's port
  35           layout using the generic DT graph presentation found in
  36           "bindings/graph.txt".
  37
  38 * Required properties for devices that don't show up on the AMBA bus, such as
  39   non-configurable replicators:
  40
  41         * compatible: Currently supported value is (note the absence of the
  42           AMBA markee):
  43                 - "arm,coresight-replicator"
  44
  45         * port or ports: same as above.
  46
  47 * Optional properties for ETM/PTMs:
  48
  49         * arm,cp14: must be present if the system accesses ETM/PTM management
  50           registers via co-processor 14.
  51
  52         * cpu: the cpu phandle this ETM/PTM is affined to. When omitted the
  53           source is considered to belong to CPU0.
  54
  55 * Optional property for TMC:
  56
  57         * arm,buffer-size: size of contiguous buffer space for TMC ETR
  58          (embedded trace router)
  59
  60
  61 Example:
  62
  63 1. Sinks
  64         etb@20010000 {
  65                 compatible = "arm,coresight-etb10", "arm,primecell";
  66                 reg = <0 0x20010000 0 0x1000>;
  67
  68                 clocks = <&oscclk6a>;
  69                 clock-names = "apb_pclk";
  70                 port {
  71                         etb_in_port: endpoint@0 {
  72                                 slave-mode;
  73                                 remote-endpoint = <&replicator_out_port0>;
  74                         };
  75                 };
  76         };
  77
  78         tpiu@20030000 {
  79                 compatible = "arm,coresight-tpiu", "arm,primecell";
  80                 reg = <0 0x20030000 0 0x1000>;
  81
  82                 clocks = <&oscclk6a>;
  83                 clock-names = "apb_pclk";
  84                 port {
  85                         tpiu_in_port: endpoint@0 {
  86                                 slave-mode;
  87                                 remote-endpoint = <&replicator_out_port1>;
  88                         };
  89                 };
  90         };
  91
  92 2. Links
  93         replicator {
  94                 /* non-configurable replicators don't show up on the
  95                  * AMBA bus.  As such no need to add "arm,primecell".
  96                  */
  97                 compatible = "arm,coresight-replicator";
  98
  99                 ports {
 100                         #address-cells = <1>;
 101                         #size-cells = <0>;
 102
 103                         /* replicator output ports */
 104                         port@0 {
 105                                 reg = <0>;
 106                                 replicator_out_port0: endpoint {
 107                                         remote-endpoint = <&etb_in_port>;
 108                                 };
 109                         };
 110
 111                         port@1 {
 112                                 reg = <1>;
 113                                 replicator_out_port1: endpoint {
 114                                         remote-endpoint = <&tpiu_in_port>;
 115                                 };
 116                         };
 117
 118                         /* replicator input port */
 119                         port@2 {
 120                                 reg = <0>;
 121                                 replicator_in_port0: endpoint {
 122                                         slave-mode;
 123                                         remote-endpoint = <&funnel_out_port0>;
 124                                 };
 125                         };
 126                 };
 127         };
 128
 129         funnel@20040000 {
 130                 compatible = "arm,coresight-funnel", "arm,primecell";
 131                 reg = <0 0x20040000 0 0x1000>;
 132
 133                 clocks = <&oscclk6a>;
 134                 clock-names = "apb_pclk";
 135                 ports {
 136                         #address-cells = <1>;
 137                         #size-cells = <0>;
 138
 139                         /* funnel output port */
 140                         port@0 {
 141                                 reg = <0>;
 142                                 funnel_out_port0: endpoint {
 143                                         remote-endpoint =
 144                                                         <&replicator_in_port0>;
 145                                 };
 146                         };
 147
 148                         /* funnel input ports */
 149                         port@1 {
 150                                 reg = <0>;
 151                                 funnel_in_port0: endpoint {
 152                                         slave-mode;
 153                                         remote-endpoint = <&ptm0_out_port>;
 154                                 };
 155                         };
 156
 157                         port@2 {
 158                                 reg = <1>;
 159                                 funnel_in_port1: endpoint {
 160                                         slave-mode;
 161                                         remote-endpoint = <&ptm1_out_port>;
 162                                 };
 163                         };
 164
 165                         port@3 {
 166                                 reg = <2>;
 167                                 funnel_in_port2: endpoint {
 168                                         slave-mode;
 169                                         remote-endpoint = <&etm0_out_port>;
 170                                 };
 171                         };
 172
 173                 };
 174         };
 175
 176 3. Sources
 177         ptm@2201c000 {
 178                 compatible = "arm,coresight-etm3x", "arm,primecell";
 179                 reg = <0 0x2201c000 0 0x1000>;
 180
 181                 cpu = <&cpu0>;
 182                 clocks = <&oscclk6a>;
 183                 clock-names = "apb_pclk";
 184                 port {
 185                         ptm0_out_port: endpoint {
 186                                 remote-endpoint = <&funnel_in_port0>;
 187                         };
 188                 };
 189         };
 190
 191         ptm@2201d000 {
 192                 compatible = "arm,coresight-etm3x", "arm,primecell";
 193                 reg = <0 0x2201d000 0 0x1000>;
 194
 195                 cpu = <&cpu1>;
 196                 clocks = <&oscclk6a>;
 197                 clock-names = "apb_pclk";
 198                 port {
 199                         ptm1_out_port: endpoint {
 200                                 remote-endpoint = <&funnel_in_port1>;
 201                         };
 202                 };
 203         };