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SubjectRE: [EXT] Re: [PATCH v5] arm64: dts: ls1088a: add one more thermal zone node
Date

> -----Original Message-----
> From: Daniel Lezcano <daniel.lezcano@linaro.org>
> Sent: 2019年4月12日 20:19
> To: Andy Tang <andy.tang@nxp.com>; shawnguo@kernel.org
> Cc: Leo Li <leoyang.li@nxp.com>; robh+dt@kernel.org; mark.rutland@arm.com;
> linux-arm-kernel@lists.infradead.org; devicetree@vger.kernel.org;
> linux-kernel@vger.kernel.org; linux-pm@vger.kernel.org; rui.zhang@intel.com;
> edubezval@gmail.com
> Subject: Re: [EXT] Re: [PATCH v5] arm64: dts: ls1088a: add one more thermal
> zone node
>
> WARNING: This email was created outside of NXP. DO NOT CLICK links or
> attachments unless you recognize the sender and know the content is safe.
>
>
>
> On 12/04/2019 09:47, Andy Tang wrote:
> >
> >> -----Original Message-----
> >> From: Daniel Lezcano <daniel.lezcano@linaro.org>
> >> Sent: 2019年4月12日 3:15
> >> To: Andy Tang <andy.tang@nxp.com>; shawnguo@kernel.org
> >> Cc: Leo Li <leoyang.li@nxp.com>; robh+dt@kernel.org;
> >> mark.rutland@arm.com; linux-arm-kernel@lists.infradead.org;
> >> devicetree@vger.kernel.org; linux-kernel@vger.kernel.org;
> >> linux-pm@vger.kernel.org; rui.zhang@intel.com; edubezval@gmail.com
> >> Subject: [EXT] Re: [PATCH v5] arm64: dts: ls1088a: add one more
> >> thermal zone node
> >>
> >> WARNING: This email was created outside of NXP. DO NOT CLICK links or
> >> attachments unless you recognize the sender and know the content is safe.
> >>
> >>
> >>
> >> On 11/04/2019 10:32, Yuantian Tang wrote:
> >>> Ls1088a has 2 thermal sensors, core cluster and SoC platform. Core
> >>> cluster sensor is used to monitor the temperature of core and SoC
> >>> platform is for platform. The current dts only support the first sensor.
> >>> This patch adds the second sensor node to dts to enable it.
> >>>
> >>> Signed-off-by: Yuantian Tang <andy.tang@nxp.com>
> >>> ---
> >>> v5:
> >>> - update the thermal zone name due to the length limitation
> >>> - remove cooling map in platform zone
> >>> v4:
> >>> - use hyphen instead of underscore in node name
> >>> v3:
> >>> - use more descriptive name for each zone
> >>> v2:
> >>> - Add more information about sensors to description
> >>> arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi | 28
> >> ++++++++++++++++++++---
> >>> 1 files changed, 24 insertions(+), 4 deletions(-)
> >>>
> >>> diff --git a/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi
> >>> b/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi
> >>> index de93b42..de39672 100644
> >>> --- a/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi
> >>> +++ b/arch/arm64/boot/dts/freescale/fsl-ls1088a.dtsi
> >>> @@ -129,19 +129,19 @@
> >>> };
> >>>
> >>> thermal-zones {
> >>> - cpu_thermal: cpu-thermal {
> >>> + core-cluster {
> >>> polling-delay-passive = <1000>;
> >>> polling-delay = <5000>;
> >>> thermal-sensors = <&tmu 0>;
> >>>
> >>> trips {
> >>> - cpu_alert: cpu-alert {
> >>> + core_cluster_alert: core-cluster-alert
> >>> + {
> >>> temperature = <85000>;
> >>> hysteresis = <2000>;
> >>> type = "passive";
> >>> };
> >>>
> >>> - cpu_crit: cpu-crit {
> >>> + core_cluster_crit: core-cluster-crit {
> >>> temperature = <95000>;
> >>> hysteresis = <2000>;
> >>> type = "critical"; @@ -150,7
> >>> +150,7 @@
> >>>
> >>> cooling-maps {
> >>> map0 {
> >>> - trip = <&cpu_alert>;
> >>> + trip = <&core_cluster_alert>;
> >>> cooling-device =
> >>> <&cpu0
> >> THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> >>> <&cpu1
> >> THERMAL_NO_LIMIT
> >>> THERMAL_NO_LIMIT>, @@ -163,6 +163,26 @@
> >>> };
> >>> };
> >>> };
> >>> +
> >>> + platform {
> >>> + polling-delay-passive = <1000>;
> >>> + polling-delay = <5000>;
> >>> + thermal-sensors = <&tmu 1>;
> >>> +
> >>> + trips {
> >>> + platform-alert {
> >>> + temperature = <85000>;
> >>> + hysteresis = <2000>;
> >>> + type = "passive";
> >>> + };
> >>> +
> >>> + platform-crit {
> >>> + temperature = <95000>;
> >>> + hysteresis = <2000>;
> >>> + type = "critical";
> >>> + };
> >>> + };
> >>> + };
> >>
> >>
> >> Unfortunately, the documentation says the thermal zone node must
> >> contain a "cooling-maps" entry.
> > That's a question.
> > If I add "cooling-maps", then multiple zones will use same cooling device.
> > If I don't, documentation says it is a " Required properties".
> > I am wondering how it was dealt with on other platform supporting multiple
> zones.
>
> I think the problem comes from the fact there are no governors capable of
> handling multiple thermal zones.
>
> The additional cooling device is the devfreq but as the mali driver is not
> upstream, the cooling map for this device does not appear. We can find the
> definitions and the driver in the AOSP [1].
>
> Moreover, the power is usually managed by the IPA governor, but this one can
> not handle multiple thermal zones, so the cooling devices are joined together
> into a single thermal zone with their contribution to the cooling effect.
>
> Other definitions I have seen upstream are incomplete or broken.
>
> [1]
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fandroid.g
> ooglesource.com%2Fkernel%2Fhikey-linaro%2F%2B%2Frefs%2Fheads%2Fandr
> oid-hikey-linaro-4.14%2Farch%2Farm64%2Fboot%2Fdts%2Fhisilicon%2Fhi3660.
> dtsi%231340&amp;data=02%7C01%7Candy.tang%40nxp.com%7C559218b1622e
> 4603251908d6bf410e4b%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7
> C636906683466836985&amp;sdata=952xIcrr11g%2B0nl2lgKrG18SlRVgGV6L%2
> BMBL3U6UaiQ%3D&amp;reserved=0
Interesting. I think we have to accept the imperfect for now.

Hi Shawn,
Any comments?

BR,
Andy
>
> > Hi Shawn,
> > What's your opinions about this?
>
>
>
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