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Commit b00c927d authored by Rohit Vaswani's avatar Rohit Vaswani Committed by Kumar Gala
Browse files

devicetree: bindings: Document Krait/Scorpion cpus and enable-method 



Scorpion and Krait don't use the spin-table enable-method.
Instead they rely on mmio register accesses to enable power and
clocks to bring CPUs out of reset. Document their enable-methods.

Cc: <devicetree@vger.kernel.org>
Signed-off-by: default avatarRohit Vaswani <rvaswani@codeaurora.org>
[sboyd: Split off into separate patch, renamed methods to
match compatible nodes]
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: default avatarKumar Gala <galak@codeaurora.org>
parent 188611af

Documentation/devicetree/bindings/arm/cpus.txt

+24 −1
Original line number Diff line number Diff line
@@ -180,7 +180,11 @@ nodes to be present and contain the properties described below. 
			  be one of:

			     "spin-table"

			     "psci"

			# On ARM 32-bit systems this property is optional.

			# On ARM 32-bit systems this property is optional and

			  can be one of:

			    "qcom,gcc-msm8660"

			    "qcom,kpss-acc-v1"

			    "qcom,kpss-acc-v2"



	- cpu-release-addr

		Usage: required for systems that have an "enable-method"
@@ -191,6 +195,21 @@ nodes to be present and contain the properties described below. 
			  property identifying a 64-bit zero-initialised

			  memory location.



	- qcom,saw

		Usage: required for systems that have an "enable-method"

		       property value of "qcom,kpss-acc-v1" or

		       "qcom,kpss-acc-v2"

		Value type: <phandle>

		Definition: Specifies the SAW[1] node associated with this CPU.



	- qcom,acc

		Usage: required for systems that have an "enable-method"

		       property value of "qcom,kpss-acc-v1" or

		       "qcom,kpss-acc-v2"

		Value type: <phandle>

		Definition: Specifies the ACC[2] node associated with this CPU.





Example 1 (dual-cluster big.LITTLE system 32-bit):



	cpus {
@@ -382,3 +401,7 @@ cpus { 
		cpu-release-addr = <0 0x20000000>;

	};

};



--

[1] arm/msm/qcom,saw2.txt

[2] arm/msm/qcom,kpss-acc.txt