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Message-ID: <CAL_Jsq+UOJcBKSiVpCsBO+VF8e0BA6JVfGhRtgoED0YbfD=W+g@mail.gmail.com>
Date: Tue, 6 Dec 2022 11:38:51 -0600
From: Rob Herring <robh@...nel.org>
To: Daniel Lezcano <daniel.lezcano@...aro.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
linux-pm@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: thermal: thermal-idle: Fix example paths
On Tue, Dec 6, 2022 at 11:15 AM Daniel Lezcano
<daniel.lezcano@...aro.org> wrote:
>
> On 11/11/2022 17:27, Rob Herring wrote:
> > The reference by path (&{/cpus/cpu@.../thermal-idle}) in the example causes
> > an error with new version of dtc:
> >
> > FATAL ERROR: Can't generate fixup for reference to path &{/cpus/cpu@.../thermal-idle}
> >
> > This is because the examples are built as an overlay and absolute paths
> > are not valid as references must be by label. The path was also not
> > resolvable because, by default, examples are placed under 'example-N'
> > nodes.
> >
> > As the example contains top-level nodes, the root node must be explicit for
> > the example to be extracted as-is. This changes the indentation for the
> > whole example, but the existing indentation is a mess of of random amounts.
> > Clean this up to be 4 spaces everywhere.
> >
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > ---
> > The dtc update is in my tree, so I'd prefer to take this via the DT
> > tree.
> >
> > .../bindings/thermal/thermal-idle.yaml | 154 +++++++++---------
> > 1 file changed, 80 insertions(+), 74 deletions(-)
> >
> > diff --git a/Documentation/devicetree/bindings/thermal/thermal-idle.yaml b/Documentation/devicetree/bindings/thermal/thermal-idle.yaml
> > index cc938d7ad1f3..72d85eb64247 100644
> > --- a/Documentation/devicetree/bindings/thermal/thermal-idle.yaml
> > +++ b/Documentation/devicetree/bindings/thermal/thermal-idle.yaml
> > @@ -48,99 +48,105 @@ additionalProperties: false
> >
> > examples:
> > - |
> > - #include <dt-bindings/thermal/thermal.h>
> > + /{
> > + #include <dt-bindings/thermal/thermal.h>
> >
> > - // Example: Combining idle cooling device on big CPUs with cpufreq cooling device
> > - cpus {
> > + compatible = "foo";
> > + model = "foo";
> > + #address-cells = <1>;
> > + #size-cells = <1>;
> > +
> > + // Example: Combining idle cooling device on big CPUs with cpufreq cooling device
> > + cpus {
> > #address-cells = <2>;
> > #size-cells = <0>;
> >
> > /* ... */
> >
> > - cpu_b0: cpu@100 {
> > - device_type = "cpu";
> > - compatible = "arm,cortex-a72";
> > - reg = <0x0 0x100>;
> > - enable-method = "psci";
> > - capacity-dmips-mhz = <1024>;
> > - dynamic-power-coefficient = <436>;
> > - #cooling-cells = <2>; /* min followed by max */
> > - cpu-idle-states = <&CPU_SLEEP>, <&CLUSTER_SLEEP>;
> > - thermal-idle {
> > - #cooling-cells = <2>;
> > - duration-us = <10000>;
> > - exit-latency-us = <500>;
> > - };
> > + cpu_b0: cpu@100 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a72";
> > + reg = <0x0 0x100>;
> > + enable-method = "psci";
> > + capacity-dmips-mhz = <1024>;
> > + dynamic-power-coefficient = <436>;
> > + #cooling-cells = <2>; /* min followed by max */
> > + cpu-idle-states = <&CPU_SLEEP>, <&CLUSTER_SLEEP>;
> > + thermal-idle {
> > + #cooling-cells = <2>;
> > + duration-us = <10000>;
> > + exit-latency-us = <500>;
> > + };
> > + };
> > +
> > + cpu_b1: cpu@101 {
> > + device_type = "cpu";
> > + compatible = "arm,cortex-a72";
> > + reg = <0x0 0x101>;
> > + enable-method = "psci";
> > + capacity-dmips-mhz = <1024>;
> > + dynamic-power-coefficient = <436>;
> > + #cooling-cells = <2>; /* min followed by max */
> > + cpu-idle-states = <&CPU_SLEEP>, <&CLUSTER_SLEEP>;
> > + thermal-idle {
> > + #cooling-cells = <2>;
> > + duration-us = <10000>;
> > + exit-latency-us = <500>;
> > };
> > + };
> >
> > - cpu_b1: cpu@101 {
> > - device_type = "cpu";
> > - compatible = "arm,cortex-a72";
> > - reg = <0x0 0x101>;
> > - enable-method = "psci";
> > - capacity-dmips-mhz = <1024>;
> > - dynamic-power-coefficient = <436>;
> > - #cooling-cells = <2>; /* min followed by max */
> > - cpu-idle-states = <&CPU_SLEEP>, <&CLUSTER_SLEEP>;
> > - thermal-idle {
> > - #cooling-cells = <2>;
> > - duration-us = <10000>;
> > - exit-latency-us = <500>;
> > - };
> > - };
> > -
> > - /* ... */
> > + /* ... */
> >
> > - };
> > + };
> >
> > - /* ... */
> > + /* ... */
> >
> > - thermal_zones {
> > - cpu_thermal: cpu {
> > + thermal_zones {
> > + cpu_thermal: cpu {
> > polling-delay-passive = <100>;
> > polling-delay = <1000>;
> >
> > /* ... */
> >
> > trips {
> > - cpu_alert0: cpu_alert0 {
> > - temperature = <65000>;
> > - hysteresis = <2000>;
> > - type = "passive";
> > - };
> > -
> > - cpu_alert1: cpu_alert1 {
> > - temperature = <70000>;
> > - hysteresis = <2000>;
> > - type = "passive";
> > - };
> > -
> > - cpu_alert2: cpu_alert2 {
> > - temperature = <75000>;
> > - hysteresis = <2000>;
> > - type = "passive";
> > - };
> > -
> > - cpu_crit: cpu_crit {
> > - temperature = <95000>;
> > - hysteresis = <2000>;
> > - type = "critical";
> > - };
> > + cpu_alert0: cpu_alert0 {
> > + temperature = <65000>;
> > + hysteresis = <2000>;
> > + type = "passive";
> > + };
> > +
> > + cpu_alert1: cpu_alert1 {
> > + temperature = <70000>;
> > + hysteresis = <2000>;
> > + type = "passive";
> > + };
> > +
> > + cpu_alert2: cpu_alert2 {
> > + temperature = <75000>;
> > + hysteresis = <2000>;
> > + type = "passive";
> > + };
> > +
> > + cpu_crit: cpu_crit {
> > + temperature = <95000>;
> > + hysteresis = <2000>;
> > + type = "critical";
> > + };
> > };
> >
> > cooling-maps {
> > - map0 {
> > - trip = <&cpu_alert1>;
> > - cooling-device = <&{/cpus/cpu@.../thermal-idle} 0 15 >,
> > - <&{/cpus/cpu@.../thermal-idle} 0 15>;
> > - };
> > -
> > - map1 {
> > - trip = <&cpu_alert2>;
> > - cooling-device =
> > - <&cpu_b0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> > - <&cpu_b1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> > - };
> > + map0 {
> > + trip = <&cpu_alert1>;
> > + cooling-device = <&cpu_b0 0 15 >,
> > + <&cpu_b1 0 15>;
>
> This is pointing to the DVFS cooling device, not the idle cooling
> device. Should it be <&cpu_b0_idle 0 15> and that label defined in
> thermal_idle ?
Ah, yes indeed. I'll fix that up with a label to the correct node.
And note that 'thermal-idle' needs to be added to cpu node schema.
That one currently allows anything extra which I'm working on
addressing.
Rob
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