> -----Original Message----- > From: Shawn Guo <shawnguo@xxxxxxxxxx> > Sent: 2019年5月10日 11:14 > To: Andy Tang <andy.tang@xxxxxxx> > Cc: Leo Li <leoyang.li@xxxxxxx>; robh+dt@xxxxxxxxxx; > mark.rutland@xxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; > devicetree@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; > linux-pm@xxxxxxxxxxxxxxx; daniel.lezcano@xxxxxxxxxx; rui.zhang@xxxxxxxxx; > edubezval@xxxxxxxxx > Subject: [EXT] Re: [PATCH v6] arm64: dts: ls1088a: add one more thermal > zone node > > Caution: EXT Email > > On Tue, Apr 23, 2019 at 10:25:07AM +0800, 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@xxxxxxx> > > --- > > v6: > > - add cooling device map to cpu0-7 in platform node. I like to explain a little. I think it makes sense that multiple thermal zone map to same cooling device. In this way, no matter which thermal zone raises a temp alarm, it can call cooling device to chill out. I also asked cpufreq maintainer about the cooling map issue, he think it would be fine. I have tested and no issue found. Daniel, what's your thought? Thanks, Andy > > @Daniel, are you fine with this version? > > Shawn
--- Begin Message ---
- Subject: [EXT] Re: Ask for help about cooling device map
- From: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
- Date: Mon, 22 Apr 2019 08:13:23 +0000
- In-reply-to: <VI1PR04MB43334F646A71A0575CAB7C03F3220@VI1PR04MB4333.eurprd04.prod.outlook.com>
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 22-04-19, 07:09, Andy Tang wrote: > Hi Viresh, > > Sorry to bother you. I have a question, hope I can get you help. > Here it is: > > I want to add multiple "Thermal Zone" support in dts ( driver is ready). > The final dts looks like below: > > thermal-zones { > cpu_thermal: cpu-thermal { > polling-delay-passive = <1000>; > polling-delay = <5000>; > thermal-sensors = <&tmu 0>; > > trips { > ccu_alert: ccu-alert { > temperature = <85000>; > hysteresis = <2000>; > type = "passive"; > }; > ccu_crit: ccu-crit { > temperature = <95000>; > hysteresis = <2000>; > type = "critical"; > cooling-maps { > map0 { > trip = <&ccu_alert>; > cooling-device = > <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu4 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu5 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>; > }; > }; > }; > platform { > polling-delay-passive = <1000>; > polling-delay = <5000>; > thermal-sensors = <&tmu 1>; > trips { > plt_alert: plt-alert { > temperature = <85000>; > hysteresis = <2000>; > type = "passive"; > }; > plt_crit: plt-crit { > temperature = <95000>; > hysteresis = <2000>; > type = "critical"; > }; > }; > cooling-maps { > map0 { > trip = <&plt_alert>; > cooling-device = > <&cpu0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu2 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu3 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu4 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu5 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu6 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>, > <&cpu7 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>; > } > } > > Here we have 2 thermal zones, but both map cpu0-7 as cooling device. I have tested and didn't find any issues. > My query is: is it allowed to map same device as "cooling device" to more than one "thermal zone"? That should be fine IMO. -- viresh
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