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Message-ID: <52d2e0c2-a04a-1ae8-cab5-b89a79150fe6@linaro.org>
Date: Tue, 6 Dec 2022 18:14:58 +0100
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Rob Herring <robh@...nel.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: 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 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 ?
> + };
> +
> + map1 {
> + trip = <&cpu_alert2>;
> + cooling-device = <&cpu_b0 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>,
> + <&cpu_b1 THERMAL_NO_LIMIT THERMAL_NO_LIMIT>;
> + };
> };
> - };
> + };
> + };
> };
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