On Tue, Aug 26, 2014 at 10:17:29AM +0800, Wei Ni wrote: > On 08/25/2014 07:07 PM, Eduardo Valentin wrote: > > Hello Wei Ni, > > > > On Mon, Aug 25, 2014 at 02:29:47PM +0800, Wei Ni wrote: > >> Add more description for the "polling-delay" property. > >> Set "trips" and "cooling maps" as optional property, because > >> if missing these two sub-nodes, the thermal zone device still > >> work properly. > >> > >> Signed-off-by: Wei Ni <wni@xxxxxxxxxx> > >> --- > >> Documentation/devicetree/bindings/thermal/thermal.txt | 10 ++++++---- > >> 1 file changed, 6 insertions(+), 4 deletions(-) > >> > >> diff --git a/Documentation/devicetree/bindings/thermal/thermal.txt b/Documentation/devicetree/bindings/thermal/thermal.txt > >> index f5db6b7..e3d3ed9 100644 > >> --- a/Documentation/devicetree/bindings/thermal/thermal.txt > >> +++ b/Documentation/devicetree/bindings/thermal/thermal.txt > >> @@ -136,8 +136,8 @@ containing trip nodes and one sub-node containing all the zone cooling maps. > >> > >> Required properties: > >> - polling-delay: The maximum number of milliseconds to wait between polls > >> - Type: unsigned when checking this thermal zone. > >> - Size: one cell > >> + Type: unsigned when checking this thermal zone. If this value is 0, the > >> + Size: one cell driver will not run polling queue, but just cancel it. > >> > > > > The description above is specific to Linux kernel implementation > > nomenclature. DT description needs to be OS agnostic. > > > >> - polling-delay-passive: The maximum number of milliseconds to wait > >> Type: unsigned between polls when performing passive cooling. > >> @@ -148,14 +148,16 @@ Required properties: > >> phandles + sensor > >> specifier > >> > >> +Optional property: > >> - trips: A sub-node which is a container of only trip point nodes > >> Type: sub-node required to describe the thermal zone. > >> > >> - cooling-maps: A sub-node which is a container of only cooling device > >> Type: sub-node map nodes, used to describe the relation between trips > >> - and cooling devices. > >> + and cooling devices. If missing the "trips" property, > >> + This sub-node will not be parsed, because no trips can > >> + be bound to cooling devices. > > > > Do you mean if the thermal zone misses the "trips" property? Actually, > > the binding describes both, cooling-maps and trips, as required > > properties. Thus, both needs to be in place to consider the thermal zone > > as a proper described zone. > > I moved the "trips" and "cooling-maps" to optional property, because if > missing these two properties, the thermal zone devices still can be > registered, and the driver can work properly, it has the basic function, > can read temperature from thermal sysfs, although it doesn't have trips > and bind with cooling devices. If a thermal zone is used only for monitoring, then I believe it lost its purpose. As Maybe a different framework shall be used, such as hwmon, for instance? The purpose of a thermal zone is to describe thermal behavior of a hardware. As it is mentioned in the thermal.txt file. > > Thanks. > Wei. > > > > >> > >> -Optional property: > >> - coefficients: An array of integers (one signed cell) containing > >> Type: array coefficients to compose a linear relation between > >> Elem size: one cell the sensors listed in the thermal-sensors property. > >> -- > >> 1.8.1.5 > >> > -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
