Re: [PATCH v8] coresight: bindings for coresight drivers

[Rob Herring]

On Tue, Oct 21, 2014 at 5:13 AM,  <mathieu.poirier@xxxxxxxxxx> wrote:
> From: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
>
> Coresight IP blocks allow for the support of HW assisted tracing
> on ARM SoCs.  Bindings for the currently available blocks are
> presented herein.
>
> Signed-off-by: Pratik Patel <pratikp@xxxxxxxxxxxxxx>
> Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>

Didn't I give you a reviewed-by on this already?

Rob

> ---
>  .../devicetree/bindings/arm/coresight.txt          | 203 +++++++++++++++++++++
>  1 file changed, 203 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/coresight.txt
>
> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
> new file mode 100644
> index 0000000..96dd947
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> @@ -0,0 +1,203 @@
> +* CoreSight Components:
> +
> +CoreSight components are compliant with the ARM CoreSight architecture
> +specification and can be connected in various topologies to suit a particular
> +SoCs tracing needs. These trace components can generally be classified as sinks,
> +links and sources. Trace data produced by one or more sources flows through the
> +intermediate links connecting the source to the currently selected sink. Each
> +CoreSight component device should use these properties to describe its hardware
> +characteristcs.
> +
> +* Required properties for all components *except* non-configurable replicators:
> +
> +       * compatible: These have to be supplemented with "arm,primecell" as
> +         drivers are using the AMBA bus interface.  Possible values include:
> +               - "arm,coresight-etb10", "arm,primecell";
> +               - "arm,coresight-tpiu", "arm,primecell";
> +               - "arm,coresight-tmc", "arm,primecell";
> +               - "arm,coresight-funnel", "arm,primecell";
> +               - "arm,coresight-etm3x", "arm,primecell";
> +
> +       * reg: physical base address and length of the register
> +         set(s) of the component.
> +
> +       * clocks: the clock associated to this component.
> +
> +       * clock-names: the name of the clock as referenced by the code.
> +         Since we are using the AMBA framework, the name should be
> +         "apb_pclk".
> +
> +       * port or ports: The representation of the component's port
> +         layout using the generic DT graph presentation found in
> +         "bindings/graph.txt".
> +
> +* Required properties for devices that don't show up on the AMBA bus, such as
> +  non-configurable replicators:
> +
> +       * compatible: Currently supported value is (note the absence of the
> +         AMBA markee):
> +               - "arm,coresight-replicator"
> +
> +       * id: a unique number that will identify this replicator.
> +
> +       * port or ports: same as above.
> +
> +* Optional properties for ETM/PTMs:
> +
> +       * arm,cp14: must be present if the system accesses ETM/PTM management registers
> +         via co-processor 14.
> +
> +       * cpu: the cpu phandle this ETM/PTM is affined to. When omitted the source is
> +         considered to belong to CPU0.
> +
> +* Optional property for TMC:
> +
> +       * arm,buffer-size: size of contiguous buffer space for TMC ETR
> +        (embedded trace router)
> +
> +
> +Example:
> +
> +1. Sinks
> +       etb@0,20010000 {
> +               compatible = "arm,coresight-etb10", "arm,primecell";
> +               reg = <0 0x20010000 0 0x1000>;
> +
> +               coresight-default-sink;
> +               clocks = <&oscclk6a>;
> +               clock-names = "apb_pclk";
> +               port {
> +                       etb_in_port: endpoint@0 {
> +                               slave-mode;
> +                               remote-endpoint = <&replicator_out_port0>;
> +                       };
> +               };
> +       };
> +
> +       tpiu@0,20030000 {
> +               compatible = "arm,coresight-tpiu", "arm,primecell";
> +               reg = <0 0x20030000 0 0x1000>;
> +
> +               clocks = <&oscclk6a>;
> +               clock-names = "apb_pclk";
> +               port {
> +                       tpiu_in_port: endpoint@0 {
> +                               slave-mode;
> +                               remote-endpoint = <&replicator_out_port1>;
> +                       };
> +               };
> +       };
> +
> +2. Links
> +       replicator {
> +               /* non-configurable replicators don't show up on the
> +                * AMBA bus.  As such no need to add "arm,primecell".
> +                */
> +               compatible = "arm,coresight-replicator";
> +               /* this will show up in debugfs as "0.replicator" */
> +               id = <0>;
> +
> +               ports {
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +
> +                       /* replicator output ports */
> +                       port@0 {
> +                               reg = <0>;
> +                               replicator_out_port0: endpoint {
> +                                       remote-endpoint = <&etb_in_port>;
> +                               };
> +                       };
> +
> +                       port@1 {
> +                               reg = <1>;
> +                               replicator_out_port1: endpoint {
> +                                       remote-endpoint = <&tpiu_in_port>;
> +                               };
> +                       };
> +
> +                       /* replicator input port */
> +                       port@2 {
> +                               reg = <0>;
> +                               replicator_in_port0: endpoint {
> +                                       slave-mode;
> +                                       remote-endpoint = <&funnel_out_port0>;
> +                               };
> +                       };
> +               };
> +       };
> +
> +       funnel@0,20040000 {
> +               compatible = "arm,coresight-funnel", "arm,primecell";
> +               reg = <0 0x20040000 0 0x1000>;
> +
> +               clocks = <&oscclk6a>;
> +               clock-names = "apb_pclk";
> +               ports {
> +                       #address-cells = <1>;
> +                       #size-cells = <0>;
> +
> +                       /* funnel output port */
> +                       port@0 {
> +                               reg = <0>;
> +                               funnel_out_port0: endpoint {
> +                                       remote-endpoint = <&replicator_in_port0>;
> +                               };
> +                       };
> +
> +                       /* funnel input ports */
> +                       port@1 {
> +                               reg = <0>;
> +                               funnel_in_port0: endpoint {
> +                                       slave-mode;
> +                                       remote-endpoint = <&ptm0_out_port>;
> +                               };
> +                       };
> +
> +                       port@2 {
> +                               reg = <1>;
> +                               funnel_in_port1: endpoint {
> +                                       slave-mode;
> +                                       remote-endpoint = <&ptm1_out_port>;
> +                               };
> +                       };
> +
> +                       port@3 {
> +                               reg = <2>;
> +                               funnel_in_port2: endpoint {
> +                                       slave-mode;
> +                                       remote-endpoint = <&etm0_out_port>;
> +                               };
> +                       };
> +
> +               };
> +       };
> +
> +3. Sources
> +       ptm@0,2201c000 {
> +               compatible = "arm,coresight-etm3x", "arm,primecell";
> +               reg = <0 0x2201c000 0 0x1000>;
> +
> +               cpu = <&cpu0>;
> +               clocks = <&oscclk6a>;
> +               clock-names = "apb_pclk";
> +               port {
> +                       ptm0_out_port: endpoint {
> +                               remote-endpoint = <&funnel_in_port0>;
> +                       };
> +               };
> +       };
> +
> +       ptm@0,2201d000 {
> +               compatible = "arm,coresight-etm3x", "arm,primecell";
> +               reg = <0 0x2201d000 0 0x1000>;
> +
> +               cpu = <&cpu1>;
> +               clocks = <&oscclk6a>;
> +               clock-names = "apb_pclk";
> +               port {
> +                       ptm1_out_port: endpoint {
> +                               remote-endpoint = <&funnel_in_port1>;
> +                       };
> +               };
> +       };
> --
> 1.9.1
>
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