On Fri, Aug 07, 2015 at 08:09:39AM +0100, Chung-Yih Wang (王崇懿) wrote:
> As there could be more thermal zones on a system and
> more variety in thermal governors provided in kernel,
> this patch provides flexibility of governor selection
> for a thermal zone declared in device tree.
>
> Change-Id: Ie4a75d762709cbbe9f1806dae325d13f71982e78
> Signed-off-by: Chung-yih Wang <cyw...@chromium.org>
> ---
> Documentation/devicetree/bindings/thermal/thermal.txt | 9 +++++++++
> drivers/thermal/of-thermal.c | 10 ++++++++++
> 2 files changed, 19 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/thermal/thermal.txt
> b/Documentation/devicetree/bindings/thermal/thermal.txt
> index 8a49362..30a5d41 100644
> --- a/Documentation/devicetree/bindings/thermal/thermal.txt
> +++ b/Documentation/devicetree/bindings/thermal/thermal.txt
> @@ -174,6 +174,13 @@ Optional property:
> 2000mW, while on a 10'' tablet is around
> 4500mW.
>
> +- thermal-governor-name: The name of governor used to control the
> + thermal zone instead of the default one
> + specified in kernel config. For reference, if
> + default governor is step_wise, one could
> + select power_allocator for cpu_thermal zone
> + in dts.
This is not a hardware or system property, but rather a Linux
implementation detail.
This really shouldn't go in the DT.
Mark.
> +
> Note: The delay properties are bound to the maximum dT/dt (temperature
> derivative over time) in two situations for a thermal zone:
> (i) - when passive cooling is activated (polling-delay-passive); and
> @@ -555,6 +562,8 @@ thermal-zones {
>
> sustainable-power = <2500>;
>
> + thermal-governor-name = "power_allocator";
> +
> trips {
> /* Trips are based on resulting linear equation */
> cpu_trip: cpu-trip {
> diff --git a/drivers/thermal/of-thermal.c b/drivers/thermal/of-thermal.c
> index b295b2b..45570ac 100644
> --- a/drivers/thermal/of-thermal.c
> +++ b/drivers/thermal/of-thermal.c
> @@ -882,6 +882,7 @@ int __init of_parse_thermal_zones(void)
> }
>
> for_each_child_of_node(np, child) {
> + const char *governor_name;
> struct thermal_zone_device *zone;
> struct thermal_zone_params *tzp;
> int i, mask = 0;
> @@ -909,6 +910,15 @@ int __init of_parse_thermal_zones(void)
> goto exit_free;
> }
>
> + /* Select a preferred governor if declared */
> + if (!of_property_read_string(child,
> + "thermal-governor-name",
> + &governor_name)) {
> + strncpy(tzp->governor_name,
> + governor_name,
> + sizeof(tzp->governor_name) - 1);
> + }
> +
> /* No hwmon because there might be hwmon drivers registering
> */
> tzp->no_hwmon = true;
>
> --
> 2.1.2
>
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