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PM / devfreq: Add MSM BIMC bwmon support for bw_hwmon governor

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The BIMC bwmon device supports monitoring read/write traffic from each BIMC
master port. It also has the capability to raise an IRQ when the traffic
count exceeds a programmable threshold. This allows for it to be used with
the bw_hwmon governor to scale the BW requests from each BIMC master.

Change-Id: Ie8a1471226411e23954ed556292186a5a864ddc1
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
This commit is contained in:
Saravana Kannan 2014-05-28 18:59:54 -07:00 • committed by David Keitel
parent 6be4cb0755
commit 76efc70d04
1 changed files with 25 additions and 0 deletions
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Documentation/devicetree/bindings/devfreq/bimc-bwmon.txt Normal file
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MSM BIMC bandwidth monitor device
bimc-bwmon is a device that represents the MSM BIMC bandwidth monitors that
can be used to measure the bandwidth of read/write traffic from the BIMC
master ports. For example, the CPU subsystem sits on one BIMC master port.
Required properties:
- compatible: Must be "qcom,bimc-bwmon"
- reg: Pairs of physical base addresses and region sizes of
memory mapped registers.
- reg-names: Names of the bases for the above registers. Expected
bases are: "base", "global_base"
- interrupts: Lists the threshold IRQ.
- qcom,mport: The hardware master port that this device can monitor
- qcom,target-dev: The DT device that corresponds to this master port
Example:
qcom,cpu-bwmon {
compatible = "qcom,bimc-bwmon";
reg = <0xfc388000 0x300>, <0xfc381000 0x200>;
reg-names = "base", "global_base";
interrupts = <0 183 1>;
qcom,mport = <0>;
qcom,target-dev = <&cpubw>;
};