[PATCH v4 05/16] PM / doc: Update device documentation for devices in IRQ safe PM domains
From: Lina Iyer <hidden>
Date: 2016-08-25 19:52:26
Also in:
linux-arm-msm, linux-pm
Subsystem:
suspend to ram, the rest · Maintainers:
"Rafael J. Wysocki", Linus Torvalds
Update documentation to reflect the changes made to support IRQ safe PM domains. Signed-off-by: Lina Iyer <redacted> --- Documentation/power/devices.txt | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/Documentation/power/devices.txt b/Documentation/power/devices.txt
index 8ba6625..a622136 100644
--- a/Documentation/power/devices.txt
+++ b/Documentation/power/devices.txt@@ -607,7 +607,17 @@ 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. + +Devices, by default, operate in process context. If a device can operate in +IRQ safe context that has to be explicitly indicated by setting the irq_safe +boolean inside struct generic_pm_domain to be true. Power domains by default, +operate in process context but could have devices that are IRQ safe. Such +power domains cannot be powered on/off during runtime PM. On the other hand, +IRQ safe PM domains that have IRQ safe devices may be powered off when all +the devices are in idle. An IRQ safe domain may only be attached as a +subdomain to another IRQ safe 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,
--
2.7.4