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Date: Wed, 27 Apr 2016 16:30:55 -0700
From: Eduardo Valentin <edubezval@...il.com>
To: Wei Ni <wni@...dia.com>
Cc: thierry.reding@...il.com, robh+dt@...nel.org, rui.zhang@...el.com,
MLongnecker@...dia.com, swarren@...dotorg.org,
mikko.perttunen@...si.fi, linux-tegra@...r.kernel.org,
linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/9] of: Add bindings of hw throttle for soctherm
From: Eduardo Valentin <edubezval@...il.com>
To: Wei Ni <wni@...dia.com>
Cc: thierry.reding@...il.com, robh+dt@...nel.org, rui.zhang@...el.com,
MLongnecker@...dia.com, swarren@...dotorg.org,
mikko.perttunen@...si.fi, linux-tegra@...r.kernel.org,
linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Bcc:
Subject: Re: [PATCH v2 4/9] of: Add bindings of hw throttle for soctherm
Reply-To:
In-Reply-To: <1461727554-15065-5-git-send-email-wni@...dia.com>
The patch title must say something about the fact that this is specific
to nvidia thermal driver.
On Wed, Apr 27, 2016 at 11:25:49AM +0800, Wei Ni wrote:
> 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: Wei Ni <wni@...dia.com>
> ---
> .../bindings/thermal/nvidia,tegra124-soctherm.txt | 89 +++++++++++++++++++++-
> 1 file changed, 87 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
> index edebfa0a985e..dc337d139f49 100644
> --- a/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
> +++ b/Documentation/devicetree/bindings/thermal/nvidia,tegra124-soctherm.txt
> @@ -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 +31,44 @@ 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:
> + - 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.
> + - cpu-throt-depth: This property is for Tegra124 and Tegra210. It is
> + the throttling depth of pulse skippers, it's the percentage
> + throttling.
> + - 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
These properties are not generic properties. My understanding is that
you must have vendor prefix in such case. Same applies to the new nodes.
> + - #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@...e2000 {
> 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 +77,45 @@ Example :
> reset-names = "soctherm";
>
> #thermal-sensor-cells = <1>;
> +
> + throttle-cfgs {
> + throttle_heavy: heavy {
> + priority = <100>;
> + cpu-throt-depth = <85>;
> +
> + #cooling-cells = <1>;
> + };
> + throttle_light: light {
> + priority = <80>;
> + cpu-throt-depth = <50>;
> +
> + #cooling-cells = <1>;
> + };
> + };
This is a sensor, which at the same time, has sub nodes that can be
cooling devices. Is my understanding correct of what you are trying to
do?
> + };
> +
> +Example: referring to Tegra132's "reg", "reg-names" and "throttle-cfgs" :
> +
> + soctherm@0,700e2000 {
> + 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 {
> + throttle_heavy: heavy {
> + priority = <100>;
> + cpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_HIGH>;
> +
> + #cooling-cells = <1>;
> + };
> + throttle_light: light {
> + priority = <80>;
> + cpu-throt-level = <TEGRA_SOCTHERM_THROT_LEVEL_MED>;
> +
> + #cooling-cells = <1>;
Could you please describe a little here what to expect of the above
setup?
> + };
> + };
> };
>
> Example: referring to thermal sensors :
> @@ -62,6 +134,19 @@ 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>;
> + };
> };
> };
> };
> --
> 1.9.1
>
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