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Message-Id: <1415835419-5565-1-git-send-email-mathieu.poirier@linaro.org>
Date: Wed, 12 Nov 2014 16:36:59 -0700
From: mathieu.poirier@...aro.org
To: gregkh@...uxfoundation.org
Cc: robherring2@...il.com, robh+dt@...nel.org,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org
Subject: [PATCH v2] coresight: bindings for coresight drivers
From: Mathieu Poirier <mathieu.poirier@...aro.org>
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@...eaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Acked-by: Rob Herring <robh@...nel.org>
---
Change for v2:
- Added ack by Rob Herring
---
.../devicetree/bindings/arm/coresight.txt | 204 +++++++++++++++++++++
1 file changed, 204 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..d790f49
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/coresight.txt
@@ -0,0 +1,204 @@
+* 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@...10000 {
+ 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@...30000 {
+ 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@...40000 {
+ 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@...1c000 {
+ 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@...1d000 {
+ 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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