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SubjectRe: [RFC] ARM: dts: omap36xx: Enable thermal throttling
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Date
On 12/09/2019 20:30, Adam Ford wrote:
> The thermal sensor in the omap3 family isn't accurate, but it's
> better than nothing. The various OPP's enabled for the omap3630
> support up to OPP1G, however the datasheet for the DM3730 states
> that OPP130 and OPP1G are not available above TJ of 90C.
>
> This patch configures the thermal throttling to limit the
> operating points of the omap3630 to Only OPP50 and OPP100 if
> the thermal sensor reads a value above 90C.

Out of curiosity, what are the OPP50 and OPP100 mentioned above? and
what does mean "OPP130 and OPP1G are not available above TJ of 90C"?

I don't see the connection between these OPP names and the definition in
the DT.

> Signed-off-by: Adam Ford <aford173@gmail.com>
>
> diff --git a/arch/arm/boot/dts/omap36xx.dtsi b/arch/arm/boot/dts/omap36xx.dtsi
> index 4bb4f534afe2..58b9d347019f 100644
> --- a/arch/arm/boot/dts/omap36xx.dtsi
> +++ b/arch/arm/boot/dts/omap36xx.dtsi
> @@ -25,6 +25,7 @@
>
> vbb-supply = <&abb_mpu_iva>;
> clock-latency = <300000>; /* From omap-cpufreq driver */
> + #cooling-cells = <2>;
> };
> };
>
> @@ -195,6 +196,31 @@
> };
> };
>
> +&cpu_thermal {
> + cpu_trips: trips {
> + /* OPP130 and OPP1G are not available above TJ of 90C. */
> + cpu_alert0: cpu_alert {
> + temperature = <90000>; /* millicelsius */
> + hysteresis = <2000>; /* millicelsius */
> + type = "passive";
> + };
> +
> + cpu_crit: cpu_crit {
> + temperature = <125000>; /* millicelsius */
> + hysteresis = <2000>; /* millicelsius */
> + type = "critical";
> + };
> + };
> +
> + cpu_cooling_maps: cooling-maps {
> + map0 {
> + trip = <&cpu_alert0>;
> + /* Only allow OPP50 and OPP100 */
> + cooling-device = <&cpu 0 1>;
> + };
> + };
> +};
> +
> /* OMAP3630 needs dss_96m_fck for VENC */
> &venc {
> clocks = <&dss_tv_fck>, <&dss_96m_fck>;
>


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