| Message ID | 1488294420-14188-2-git-send-email-leo.yan@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v2,1/3] coresight: bindings for debug module | expand |
On Wed, Mar 01, 2017 at 08:45:50AM -0700, Mathieu Poirier wrote: > On Tue, Feb 28, 2017 at 11:06:58PM +0800, Leo Yan wrote: > > According to ARMv8 architecture reference manual (ARM DDI 0487A.k) > > Chapter 'Part H: External debug', the CPU can integrate debug module > > and it can support self-hosted debug and external debug. Especially > > for supporting self-hosted debug, this means the program can access > > the debug module from mmio region; and usually the mmio region is > > integrated with coresight. > > > > So add document for binding debug component, includes binding to APB > > clock; and also need specify the CPU node which the debug module is > > dedicated to specific CPU. > > > > Suggested-by: Mike Leach <mike.leach@linaro.org> > > Signed-off-by: Leo Yan <leo.yan@linaro.org> > > --- > > .../devicetree/bindings/arm/coresight-debug.txt | 40 ++++++++++++++++++++++ > > 1 file changed, 40 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/arm/coresight-debug.txt > > > > diff --git a/Documentation/devicetree/bindings/arm/coresight-debug.txt b/Documentation/devicetree/bindings/arm/coresight-debug.txt > > new file mode 100644 > > index 0000000..89820d5 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/arm/coresight-debug.txt > > @@ -0,0 +1,40 @@ > > +* CoreSight Debug Component: > > + > > +CoreSight debug component are compliant with the ARMv8 architecture reference > > +manual (ARM DDI 0487A.k) Chapter 'Part H: External debug'. The external debug > > +module is mainly used for two modes: self-hosted debug and external debug, and > > +it can be accessed from mmio region from Coresight and eventually the debug > > +module connects with CPU for debugging. And the debug module provides > > +sample-based profiling extension, which can be used to sample CPU program > > +counter, secure state and exception level, etc; usually every CPU has one > > +dedicated debug module to be connected. > > + > > +Required properties: > > + > > +- compatible : should be > > + * "arm,coresight-debug", "arm,primecell"; supplemented with > > + "arm,primecell" as driver is using the AMBA bus interface. > > * "arm,coresight-debug"; supplemented with "arm,primecell" since > this driver is using the AMBA bus interface. > > > + > > +- reg : physical base address and length of the register set. > > + > > +- clocks : the clock associated to this component. > > + > > +- clock-names : the name of the clock referenced by the code. Since we are > > + using the AMBA framework, the name of the clock providing > > + the interconnect should be "apb_pclk" and the clock is > > + mandatory. The interface between the debug logic and the > > + processor core is clocked by the internal CPU clock, so it > > + is enabled with CPU clock by default. > > + > > +- cpu : the cpu phandle the debug module is affined to. When omitted > > + the source is considered to belong to CPU0. > > s/source/module > > With those change: > > Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org> Thanks for reviewing :) > > + > > +Example: > > + > > + debug@f6590000 { > > + compatible = "arm,coresight-debug","arm,primecell"; > > + reg = <0 0xf6590000 0 0x1000>; > > + clocks = <&sys_ctrl HI6220_DAPB_CLK>; > > + clock-names = "apb_pclk"; > > + cpu = <&cpu0>; > > + }; > > -- > > 2.7.4 > > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/Documentation/devicetree/bindings/arm/coresight-debug.txt b/Documentation/devicetree/bindings/arm/coresight-debug.txt new file mode 100644 index 0000000..89820d5 --- /dev/null +++ b/Documentation/devicetree/bindings/arm/coresight-debug.txt @@ -0,0 +1,40 @@ +* CoreSight Debug Component: + +CoreSight debug component are compliant with the ARMv8 architecture reference +manual (ARM DDI 0487A.k) Chapter 'Part H: External debug'. The external debug +module is mainly used for two modes: self-hosted debug and external debug, and +it can be accessed from mmio region from Coresight and eventually the debug +module connects with CPU for debugging. And the debug module provides +sample-based profiling extension, which can be used to sample CPU program +counter, secure state and exception level, etc; usually every CPU has one +dedicated debug module to be connected. + +Required properties: + +- compatible : should be + * "arm,coresight-debug", "arm,primecell"; supplemented with + "arm,primecell" as driver is using the AMBA bus interface. + +- reg : physical base address and length of the register set. + +- clocks : the clock associated to this component. + +- clock-names : the name of the clock referenced by the code. Since we are + using the AMBA framework, the name of the clock providing + the interconnect should be "apb_pclk" and the clock is + mandatory. The interface between the debug logic and the + processor core is clocked by the internal CPU clock, so it + is enabled with CPU clock by default. + +- cpu : the cpu phandle the debug module is affined to. When omitted + the source is considered to belong to CPU0. + +Example: + + debug@f6590000 { + compatible = "arm,coresight-debug","arm,primecell"; + reg = <0 0xf6590000 0 0x1000>; + clocks = <&sys_ctrl HI6220_DAPB_CLK>; + clock-names = "apb_pclk"; + cpu = <&cpu0>; + };
According to ARMv8 architecture reference manual (ARM DDI 0487A.k) Chapter 'Part H: External debug', the CPU can integrate debug module and it can support self-hosted debug and external debug. Especially for supporting self-hosted debug, this means the program can access the debug module from mmio region; and usually the mmio region is integrated with coresight. So add document for binding debug component, includes binding to APB clock; and also need specify the CPU node which the debug module is dedicated to specific CPU. Suggested-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Leo Yan <leo.yan@linaro.org> --- .../devicetree/bindings/arm/coresight-debug.txt | 40 ++++++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 Documentation/devicetree/bindings/arm/coresight-debug.txt -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html