drivers: cpuidle: Add status property to ARM idle states

On some platforms the device tree bindings must provide the kernel
with a status flag for idle states, that defines whether the idle
state is operational or not in the current configuration.

This patch adds a status property to the ARM idle states compliant
with ePAPR v1.1 and updates the DT parsing code accordingly.

Acked-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Lorenzo Pieralisi 2014-10-15 16:50:52 +01:00 committed by Daniel Lezcano
parent fc14f9c127
commit 97735da074
2 changed files with 17 additions and 0 deletions

View file

@ -317,6 +317,20 @@ follows:
In such systems entry-latency-us + exit-latency-us
will exceed wakeup-latency-us by this duration.
- status:
Usage: Optional
Value type: <string>
Definition: A standard device tree property [5] that indicates
the operational status of an idle-state.
If present, it shall be:
"okay": to indicate that the idle state is
operational.
"disabled": to indicate that the idle state has
been disabled in firmware so it is not
operational.
If the property is not present the idle-state must
be considered operational.
In addition to the properties listed above, a state node may require
additional properties specifics to the entry-method defined in the
idle-states node, please refer to the entry-method bindings

View file

@ -169,6 +169,9 @@ int dt_init_idle_driver(struct cpuidle_driver *drv,
if (!state_node)
break;
if (!of_device_is_available(state_node))
continue;
if (!idle_state_valid(state_node, i, cpumask)) {
pr_warn("%s idle state not valid, bailing out\n",
state_node->full_name);