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Date: Mon, 10 Nov 2014 16:22:42 -0600
From: Rob Herring <robherring2@...il.com>
To: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 RESEND] coresight: bindings for coresight drivers
On Mon, Nov 10, 2014 at 3:32 PM, <mathieu.poirier@...aro.org> wrote:
> Can someone in the bindings' maintainer brigade pick this up? The code has been
> added to linux-next:
> a06ae86 coresight: add CoreSight core layer framework
Perhaps when I get over being annoyed that you keep sending this as a
new version with no changes (or perhaps there are, but there is no
change log) and that you have failed to respond to my previous 3
emails on it. I've already acked it, so it could have been merged with
the rest of the series. I've also just noticed you have also failed to
address the minor comment did I have along with my ack.
Rob
>
> Thanks,
> Mathieu
>
> From 12ec0ef4753125e470a0899fabd94b46b3a93a9d Mon Sep 17 00:00:00 2001
> From: Mathieu Poirier <mathieu.poirier@...aro.org>
> Date: Thu, 7 Aug 2014 12:34:06 -0600
> Subject: [PATCH v9] coresight: bindings for coresight drivers
>
> 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>
> ---
> .../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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