Merge branch 'cpuidle/3.19' of http://git.linaro.org/git-ro/people/daniel.lezcano/linux into pm-cpuidle

Pull ARM cpuidle material for 3.19-rc1 from Daniel Lezcano.

* 'cpuidle/3.19' of http://git.linaro.org/git-ro/people/daniel.lezcano/linux:
  drivers: cpuidle: Remove cpuidle-arm64 duplicate error messages
  drivers: cpuidle: Add idle-state-name description to ARM idle states
  drivers: cpuidle: Add status property to ARM idle states

3 files changed, 31 insertions, 12 deletions

diff --git a/Documentation/devicetree/bindings/arm/idle-states.txt b/Documentation/devicetree/bindings/arm/idle-states.txt
index 37375c7f3ccc..a8274eabae2e 100644
--- a/Documentation/devicetree/bindings/arm/idle-states.txt
+++ b/Documentation/devicetree/bindings/arm/idle-states.txt
@@ -317,6 +317,26 @@ 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.
+
+        - idle-state-name:
+                Usage: Optional
+                Value type: <string>
+                Definition: A string used as a descriptive name for the idle
+                            state.
+
         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
diff --git a/drivers/cpuidle/cpuidle-arm64.c b/drivers/cpuidle/cpuidle-arm64.c
index 50997ea942fc..1b10f92ecd5a 100644
--- a/drivers/cpuidle/cpuidle-arm64.c
+++ b/drivers/cpuidle/cpuidle-arm64.c
@@ -104,11 +104,8 @@ static int __init arm64_idle_init(void)
          * reason to initialize the idle driver if only wfi is supported.
          */
         ret = dt_init_idle_driver(drv, arm64_idle_state_match, 1);
-        if (ret <= 0) {
-                if (ret)
-                        pr_err("failed to initialize idle states\n");
+        if (ret <= 0)
                 return ret ? : -ENODEV;
-        }
 
         /*
          * Call arch CPU operations in order to initialize
@@ -122,12 +119,6 @@ static int __init arm64_idle_init(void)
                 }
         }
 
-        ret = cpuidle_register(drv, NULL);
-        if (ret) {
-                pr_err("failed to register cpuidle driver\n");
-                return ret;
-        }
-
-        return 0;
+        return cpuidle_register(drv, NULL);
 }
 device_initcall(arm64_idle_init);
diff --git a/drivers/cpuidle/dt_idle_states.c b/drivers/cpuidle/dt_idle_states.c
index 52f4d11bbf3f..5301912cb84e 100644
--- a/drivers/cpuidle/dt_idle_states.c
+++ b/drivers/cpuidle/dt_idle_states.c
@@ -27,6 +27,7 @@ static int init_state_node(struct cpuidle_state *idle_state,
 {
         int err;
         const struct of_device_id *match_id;
+        const char *desc;
 
         match_id = of_match_node(matches, state_node);
         if (!match_id)
@@ -73,6 +74,10 @@ static int init_state_node(struct cpuidle_state *idle_state,
                 return -EINVAL;
         }
 
+        err = of_property_read_string(state_node, "idle-state-name", &desc);
+        if (err)
+                desc = state_node->name;
+
         idle_state->flags = CPUIDLE_FLAG_TIME_VALID;
         if (of_property_read_bool(state_node, "local-timer-stop"))
                 idle_state->flags |= CPUIDLE_FLAG_TIMER_STOP;
@@ -82,7 +87,7 @@ static int init_state_node(struct cpuidle_state *idle_state,
          *      and desc become string pointers
          */
         strncpy(idle_state->name, state_node->name, CPUIDLE_NAME_LEN - 1);
-        strncpy(idle_state->desc, state_node->name, CPUIDLE_DESC_LEN - 1);
+        strncpy(idle_state->desc, desc, CPUIDLE_DESC_LEN - 1);
         return 0;
 }
 
@@ -169,6 +174,9 @@ 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);