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Commit 87a47c4a authored by Saravana Kannan's avatar Saravana Kannan
Browse files

PM / devfreq: Make the CPUBW voting device driver to be more generic 



Making the driver more generic would allow it to be reused for voting for
BW requirements of other devices like GPU, etc.

Instead of cpubw and qcom,cpubw, the driver and the device are now called
devbw and qcom,devbw respectively.

Change-Id: I49e5a5ba6d46517da19d013413abd471a730af29
Signed-off-by: default avatarSaravana Kannan <skannan@codeaurora.org>
parent d8b46e28

Documentation/devicetree/bindings/arm/msm/cpubw.txt

deleted100644 → 0
+0 −30
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MSM CPU bandwidth device



cpubw is a device that represents the CPU subsystem master ports in a MSM SoC

and the related info that is needed to make CPU to DDR bandwidth votes.



Required properties:

- compatible:		Must be "qcom,cpubw"

- qcom,cpu-mem-ports:	A list of tuples where each tuple consists of a bus

			master (CPU subsystem) port number and a bus slave

			(memory) port number.

- qcom,bw-tbl:		A list of meaningful instantaneous bandwidth values

			(in MB/s) that can be requested from the CPU

			subsystem to DDR. The list of values depend on the

			supported DDR frequencies and the bus widths.



Example:



	qcom,cpubw {

		compatible = "qcom,cpubw";

		qcom,cpu-mem-ports = <1 512>, <2 512>;

		qcom,bw-tbl =

			<  572 /*  75 MHz */ >,

			< 1144 /* 150 MHz */ >,

			< 1525 /* 200 MHz */ >,

			< 2342 /* 307 MHz */ >,

			< 3509 /* 460 MHz */ >,

			< 4684 /* 614 MHz */ >,

			< 6103 /* 800 MHz */ >,

			< 7102 /* 931 MHz */ >;

	};

Documentation/devicetree/bindings/devfreq/devbw.txt

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MSM device bandwidth device



devbw is a device that represents a MSM device's BW requirements from its

master port(s) to a different device's slave port(s) in a MSM SoC. This

device is typically used to vote for BW requirements from a device's (Eg:

CPU, GPU) master port(s) to the slave (Eg: DDR) port(s).



Required properties:

- compatible:		Must be "qcom,devbw"

- qcom,src-dst-ports:	A list of tuples where each tuple consists of a bus

			master port number and a bus slave port number.

- qcom,bw-tbl:		A list of meaningful instantaneous bandwidth values

			(in MB/s) that can be requested from the device

			master port to the slave port. The list of values

			depend on the supported bus/slave frequencies and the

			bus width.



Optional properties:

- qcom,active-only:	Indicates that the bandwidth votes need to be

			enforced only when the CPU subsystem is active.

- governor:		Initial governor to use for the device.

			Default: "performance"



Example:



	qcom,cpubw {

		compatible = "qcom,devbw";

		qcom,src-dst-ports = <1 512>, <2 512>;

		qcom,active-only;

		qcom,bw-tbl =

			<  572 /*  75 MHz */ >,

			< 1144 /* 150 MHz */ >,

			< 1525 /* 200 MHz */ >,

			< 2342 /* 307 MHz */ >,

			< 3509 /* 460 MHz */ >,

			< 4684 /* 614 MHz */ >,

			< 6103 /* 800 MHz */ >,

			< 7102 /* 931 MHz */ >;

	};

arch/arm/boot/dts/qcom/apq8084.dtsi

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@@ -4158,8 +4158,10 @@ 
	};



	cpubw: qcom,cpubw {

		compatible = "qcom,cpubw";

		qcom,cpu-mem-ports = <1 512>;

		compatible = "qcom,devbw";

		governor = "cpufreq";

		qcom,src-dst-ports = <1 512>;

		qcom,active-only;

		qcom,bw-tbl =

			<   762 /*   50 MHz */ >,

			<  1144 /*   75 MHz */ >,

arch/arm/boot/dts/qcom/fsm9900.dtsi

+4 −2
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@@ -693,8 +693,10 @@ 
	};



	cpubw: qcom,cpubw {

		compatible = "qcom,cpubw";

		qcom,cpu-mem-ports = <1 512>, <2 512>;

		compatible = "qcom,devbw";

		governor = "cpufreq";

		qcom,src-dst-ports = <1 512>, <2 512>;

		qcom,active-only;

		qcom,bw-tbl =

			<  572 /*  75 MHz */ >,

			< 1144 /* 150 MHz */ >,

arch/arm/boot/dts/qcom/mdm9630.dtsi

+4 −2
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@@ -758,8 +758,10 @@ 
	};



	cpubw: qcom,cpubw {

		compatible = "qcom,cpubw";

		qcom,cpu-mem-ports = <1 512>;

		compatible = "qcom,devbw";

		governor = "cpufreq";

		qcom,src-dst-ports = <1 512>;

		qcom,active-only;

		qcom,bw-tbl =

			< 1266 /* 166 MHz */ >,

			< 2540 /* 333 MHz */ >,