Update documentation to reflect the changes made to support IRQ safe PM domains. Signed-off-by: Lina Iyer <lina.iyer@xxxxxxxxxx> Acked-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> --- Changes since v3: - Moved para to the end of the section - Added clause for all IRQ safe devices in a domain - Cleanup explanation of nested domains --- Documentation/power/devices.txt | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/Documentation/power/devices.txt b/Documentation/power/devices.txt index 8ba6625..9218ce6 100644 --- a/Documentation/power/devices.txt +++ b/Documentation/power/devices.txt @@ -607,7 +607,9 @@ individually. Instead, a set of devices sharing a power resource can be put into a low-power state together at the same time by turning off the shared power resource. Of course, they also need to be put into the full-power state together, by turning the shared power resource on. A set of devices with this -property is often referred to as a power domain. +property is often referred to as a power domain. A power domain may also be +nested inside another power domain. The nested domain is referred to as the +sub-domain of the parent domain. Support for power domains is provided through the pm_domain field of struct device. This field is a pointer to an object of type struct dev_pm_domain, @@ -629,6 +631,13 @@ support for power domains into subsystem-level callbacks, for example by modifying the platform bus type. Other platforms need not implement it or take it into account in any way. +Devices and PM domains may be defined as IRQ-safe, if they can be powered +on/off even when the IRQs are disabled. An IRQ-safe device in a domain will +disallow power management on the domain, unless the domain is also defined as +IRQ-safe. In other words, a domain containing all IRQ-safe devices must also +be defined as IRQ-safe. Another restriction this framework imposes on the +parent domain of an IRQ-safe domain is that the parent domain must also be +defined as IRQ-safe. Device Low Power (suspend) States --------------------------------- -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
