Commit 44f3d417 authored by Wei Ni's avatar Wei Ni Committed by Zhang Rui

of: Add bindings of hw throttle for Tegra soctherm

Add HW throttle configuration sub-node for soctherm, which
is used to describe the throttle event, and worked as a
cooling device. The "hot" type trip in thermal zone can
be bound to this cooling device, and trigger the throttle
function.
Signed-off-by: default avatarWei Ni <wni@nvidia.com>
Acked-by: Rob Herring's avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
parent c6935931
......@@ -10,8 +10,14 @@ Required properties :
- compatible : For Tegra124, must contain "nvidia,tegra124-soctherm".
For Tegra132, must contain "nvidia,tegra132-soctherm".
For Tegra210, must contain "nvidia,tegra210-soctherm".
- reg : Should contain 1 entry:
- reg : Should contain at least 2 entries for each entry in reg-names:
- SOCTHERM register set
- Tegra CAR register set: Required for Tegra124 and Tegra210.
- CCROC register set: Required for Tegra132.
- reg-names : Should contain at least 2 entries:
- soctherm-reg
- car-reg
- ccroc-reg
- interrupts : Defines the interrupt used by SOCTHERM
- clocks : Must contain an entry for each entry in clock-names.
See ../clocks/clock-bindings.txt for details.
......@@ -25,17 +31,45 @@ Required properties :
- #thermal-sensor-cells : Should be 1. See ./thermal.txt for a description
of this property. See <dt-bindings/thermal/tegra124-soctherm.h> for a
list of valid values when referring to thermal sensors.
- throttle-cfgs: A sub-node which is a container of configuration for each
hardware throttle events. These events can be set as cooling devices.
* throttle events: Sub-nodes must be named as "light" or "heavy".
Properties:
- nvidia,priority: Each throttles has its own throttle settings, so the
SW need to set priorities for various throttle, the HW arbiter can select
the final throttle settings.
Bigger value indicates higher priority, In general, higher priority
translates to lower target frequency. SW needs to ensure that critical
thermal alarms are given higher priority, and ensure that there is
no race if priority of two vectors is set to the same value.
The range of this value is 1~100.
- nvidia,cpu-throt-percent: This property is for Tegra124 and Tegra210.
It is the throttling depth of pulse skippers, it's the percentage
throttling.
- nvidia,cpu-throt-level: This property is only for Tegra132, it is the
level of pulse skippers, which used to throttle clock frequencies. It
indicates cpu clock throttling depth, and the depth can be programmed.
Must set as following values:
TEGRA_SOCTHERM_THROT_LEVEL_LOW, TEGRA_SOCTHERM_THROT_LEVEL_MED
TEGRA_SOCTHERM_THROT_LEVEL_HIGH, TEGRA_SOCTHERM_THROT_LEVEL_NONE
- #cooling-cells: Should be 1. This cooling device only support on/off state.
See ./thermal.txt for a description of this property.
Note:
- the "critical" type trip points will be set to SOC_THERM hardware as the
shut down temperature. Once the temperature of this thermal zone is higher
than it, the system will be shutdown or reset by hardware.
- the "hot" type trip points will be set to SOC_THERM hardware as the throttle
temperature. Once the the temperature of this thermal zone is higher
than it, it will trigger the HW throttle event.
Example :
soctherm@700e2000 {
compatible = "nvidia,tegra124-soctherm";
reg = <0x0 0x700e2000 0x0 0x1000>;
reg = <0x0 0x700e2000 0x0 0x600 /* SOC_THERM reg_base */
0x0 0x60006000 0x0 0x400 /* CAR reg_base */
reg-names = "soctherm-reg", "car-reg";
interrupts = <GIC_SPI 48 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&tegra_car TEGRA124_CLK_TSENSOR>,
<&tegra_car TEGRA124_CLK_SOC_THERM>;
......@@ -44,6 +78,76 @@ Example :
reset-names = "soctherm";
#thermal-sensor-cells = <1>;
throttle-cfgs {
/*
* When the "heavy" cooling device triggered,
* the HW will skip cpu clock's pulse in 85% depth
*/
throttle_heavy: heavy {
nvidia,priority = <100>;
nvidia,cpu-throt-percent = <85>;
#cooling-cells = <1>;
};
/*
* When the "light" cooling device triggered,
* the HW will skip cpu clock's pulse in 50% depth
*/
throttle_light: light {
nvidia,priority = <80>;
nvidia,cpu-throt-percent = <50>;
#cooling-cells = <1>;
};
/*
* If these two devices are triggered in same time, the HW throttle
* arbiter will select the highest priority as the final throttle
* settings to skip cpu pulse.
*/
};
};
Example: referring to Tegra132's "reg", "reg-names" and "throttle-cfgs" :
soctherm@700e2000 {
compatible = "nvidia,tegra132-soctherm";
reg = <0x0 0x700e2000 0x0 0x600 /* SOC_THERM reg_base */
0x0 0x70040000 0x0 0x200>; /* CCROC reg_base */;
reg-names = "soctherm-reg", "ccroc-reg";
throttle-cfgs {
/*
* When the "heavy" cooling device triggered,
* the HW will skip cpu clock's pulse in HIGH level
*/
throttle_heavy: heavy {
nvidia,priority = <100>;
nvidia,cpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_HIGH>;
#cooling-cells = <1>;
};
/*
* When the "light" cooling device triggered,
* the HW will skip cpu clock's pulse in MED level
*/
throttle_light: light {
nvidia,priority = <80>;
nvidia,cpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_MED>;
#cooling-cells = <1>;
};
/*
* If these two devices are triggered in same time, the HW throttle
* arbiter will select the highest priority as the final throttle
* settings to skip cpu pulse.
*/
};
};
Example: referring to thermal sensors :
......@@ -62,6 +166,19 @@ Example: referring to thermal sensors :
hysteresis = <1000>;
type = "critical";
};
cpu_throttle_trip: throttle-trip {
temperature = <100000>;
hysteresis = <1000>;
type = "hot";
};
};
cooling-maps {
map0 {
trip = <&cpu_throttle_trip>;
cooling-device = <&throttle_heavy 1 1>;
};
};
};
};
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