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Commit 97735da0 authored by Lorenzo Pieralisi's avatar Lorenzo Pieralisi Committed by Daniel Lezcano
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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: default avatarKevin Hilman <khilman@linaro.org>
Signed-off-by: default avatarLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
parent fc14f9c1

Documentation/devicetree/bindings/arm/idle-states.txt

+14 −0
Original line number Diff line number Diff line
@@ -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

drivers/cpuidle/dt_idle_states.c

+3 −0
Original line number Diff line number Diff line
@@ -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);