lkml.org 
[lkml]   [2019]   [Apr]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[RFC PATCH 7/9] dt-bindings: power: avs: Add support for CPR (Core Power Reduction)
Date
Add DT bindings to describe the CPR HW found on certain Qualcomm SoCs.

Co-developed-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
Signed-off-by: Niklas Cassel <niklas.cassel@linaro.org>
---
.../bindings/power/avs/qcom,cpr.txt | 119 ++++++++++++++++++
1 file changed, 119 insertions(+)
create mode 100644 Documentation/devicetree/bindings/power/avs/qcom,cpr.txt

diff --git a/Documentation/devicetree/bindings/power/avs/qcom,cpr.txt b/Documentation/devicetree/bindings/power/avs/qcom,cpr.txt
new file mode 100644
index 000000000000..541c9b31cd3b
--- /dev/null
+++ b/Documentation/devicetree/bindings/power/avs/qcom,cpr.txt
@@ -0,0 +1,119 @@
+QCOM CPR (Core Power Reduction)
+
+CPR (Core Power Reduction) is a technology to reduce core power on a CPU
+or other device. Each OPP of a device corresponds to a "corner" that has
+a range of valid voltages for a particular frequency. While the device is
+running at a particular frequency, CPR monitors dynamic factors such as
+temperature, etc. and suggests adjustments to the voltage to save power
+and meet silicon characteristic requirements.
+
+- compatible:
+ Usage: required
+ Value type: <string>
+ Definition: must be "qcom,cpr"
+
+- reg:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: base address and size of the rbcpr register region
+
+- interrupts:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: list of three interrupts in order of irq0, irq1, irq2
+
+- acc-syscon:
+ Usage: optional
+ Value type: <phandle>
+ Definition: phandle to syscon for writing ACC settings
+
+- nvmem:
+ Usage: required
+ Value type: <phandle>
+ Definition: phandle to nvmem provider containing efuse settings
+
+- nvmem-names:
+ Usage: required
+ Value type: <string>
+ Definition: must be "qfprom"
+
+vdd-mx-supply = <&pm8916_l3>;
+
+- qcom,cpr-ref-clk:
+ Usage: required
+ Value type: <u32>
+ Definition: rate of reference clock in kHz
+
+- qcom,cpr-timer-delay-us:
+ Usage: required
+ Value type: <u32>
+ Definition: delay in uS for the timer interval
+
+- qcom,cpr-timer-cons-up:
+ Usage: required
+ Value type: <u32>
+ Definition: Consecutive number of timer intervals, or units of
+ qcom,cpr-timer-delay-us, that occur before issuing an up
+ interrupt
+
+- qcom,cpr-timer-cons-down:
+ Usage: required
+ Value type: <u32>
+ Definition: Consecutive number of timer intervals, or units of
+ qcom,cpr-timer-delay-us, that occur before issuing a down
+ interrupt
+
+- qcom,cpr-up-threshold:
+ Usage: optional
+ Value type: <u32>
+ Definition: The threshold for CPR to issue interrupt when error_steps
+ is greater than it when stepping up
+
+- qcom,cpr-down-threshold:
+ Usage: optional
+ Value type: <u32>
+ Definition: The threshold for CPR to issue interrdownt when error_steps
+ is greater than it when stepping down
+
+- qcom,cpr-down-threshold:
+ Usage: optional
+ Value type: <u32>
+ Definition: Idle clock cycles ring oscillator can be in
+
+- qcom,cpr-gcnt-us:
+ Usage: required
+ Value type: <u32>
+ Definition: The time for gate count in uS
+
+- qcom,vdd-apc-step-up-limit:
+ Usage: required
+ Value type: <u32>
+ Definition: Limit of vdd-apc-supply steps for scaling up
+
+- qcom,vdd-apc-step-down-limit:
+ Usage: required
+ Value type: <u32>
+ Definition: Limit of vdd-apc-supply steps for scaling down
+
+Example:
+
+ avs@b018000 {
+ compatible = "qcom,cpr";
+ reg = <0xb018000 0x1000>;
+ interrupts = <0 15 1>, <0 16 1>, <0 17 1>;
+ vdd-mx-supply = <&pm8916_l3>;
+ acc-syscon = <&tcsr>;
+ nvmem = <&qfprom>;
+ nvmem-names = "qfprom";
+
+ qcom,cpr-ref-clk = <19200>;
+ qcom,cpr-timer-delay-us = <5000>;
+ qcom,cpr-timer-cons-up = <0>;
+ qcom,cpr-timer-cons-down = <2>;
+ qcom,cpr-up-threshold = <0>;
+ qcom,cpr-down-threshold = <2>;
+ qcom,cpr-idle-clocks = <15>;
+ qcom,cpr-gcnt-us = <1>;
+ qcom,vdd-apc-step-up-limit = <1>;
+ qcom,vdd-apc-step-down-limit = <1>;
+ };
--
2.20.1
\
 
 \ /
  Last update: 2019-04-04 07:13    [W:0.172 / U:29.116 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site