drivers: cpuidle: initialize big.LITTLE driver through DT

With the introduction of DT based idle states, CPUidle drivers for ARM
can now initialize idle states data through properties in the device tree.

This patch adds code to the big.LITTLE CPUidle driver to dynamically
initialize idle states data through the updated device tree source file.

Cc: Chander Kashyap <k.chander@samsung.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>

3 files changed, 43 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
index a25c262326dc..322fd1519b09 100644
--- a/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
+++ b/arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts
@@ -38,6 +38,7 @@
                         compatible = "arm,cortex-a15";
                         reg = <0>;
                         cci-control-port = <&cci_control1>;
+                        cpu-idle-states = <&CLUSTER_SLEEP_BIG>;
                 };
 
                 cpu1: cpu@1 {
@@ -45,6 +46,7 @@
                         compatible = "arm,cortex-a15";
                         reg = <1>;
                         cci-control-port = <&cci_control1>;
+                        cpu-idle-states = <&CLUSTER_SLEEP_BIG>;
                 };
 
                 cpu2: cpu@2 {
@@ -52,6 +54,7 @@
                         compatible = "arm,cortex-a7";
                         reg = <0x100>;
                         cci-control-port = <&cci_control2>;
+                        cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>;
                 };
 
                 cpu3: cpu@3 {
@@ -59,6 +62,7 @@
                         compatible = "arm,cortex-a7";
                         reg = <0x101>;
                         cci-control-port = <&cci_control2>;
+                        cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>;
                 };
 
                 cpu4: cpu@4 {
@@ -66,6 +70,25 @@
                         compatible = "arm,cortex-a7";
                         reg = <0x102>;
                         cci-control-port = <&cci_control2>;
+                        cpu-idle-states = <&CLUSTER_SLEEP_LITTLE>;
+                };
+
+                idle-states {
+                        CLUSTER_SLEEP_BIG: cluster-sleep-big {
+                                compatible = "arm,idle-state";
+                                local-timer-stop;
+                                entry-latency-us = <1000>;
+                                exit-latency-us = <700>;
+                                min-residency-us = <2000>;
+                        };
+
+                        CLUSTER_SLEEP_LITTLE: cluster-sleep-little {
+                                compatible = "arm,idle-state";
+                                local-timer-stop;
+                                entry-latency-us = <1000>;
+                                exit-latency-us = <500>;
+                                min-residency-us = <2500>;
+                        };
                 };
         };
 
diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 38cff69ffe06..e339c7f2c2b7 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm
@@ -7,6 +7,7 @@ config ARM_BIG_LITTLE_CPUIDLE
         depends on MCPM
         select ARM_CPU_SUSPEND
         select CPU_IDLE_MULTIPLE_DRIVERS
+        select DT_IDLE_STATES
         help
           Select this option to enable CPU idle driver for big.LITTLE based
           ARM systems. Driver manages CPUs coordination through MCPM and
diff --git a/drivers/cpuidle/cpuidle-big_little.c b/drivers/cpuidle/cpuidle-big_little.c
index 9342a94f417f..fbc00a1d3c48 100644
--- a/drivers/cpuidle/cpuidle-big_little.c
+++ b/drivers/cpuidle/cpuidle-big_little.c
@@ -24,6 +24,8 @@
 #include <asm/smp_plat.h>
 #include <asm/suspend.h>
 
+#include "dt_idle_states.h"
+
 static int bl_enter_powerdown(struct cpuidle_device *dev,
                               struct cpuidle_driver *drv, int idx);
 
@@ -73,6 +75,12 @@ static struct cpuidle_driver bl_idle_little_driver = {
         .state_count = 2,
 };
 
+static const struct of_device_id bl_idle_state_match[] __initconst = {
+        { .compatible = "arm,idle-state",
+          .data = bl_enter_powerdown },
+        { },
+};
+
 static struct cpuidle_driver bl_idle_big_driver = {
         .name = "big_idle",
         .owner = THIS_MODULE,
@@ -191,6 +199,17 @@ static int __init bl_idle_init(void)
         if (ret)
                 goto out_uninit_little;
 
+        /* Start at index 1, index 0 standard WFI */
+        ret = dt_init_idle_driver(&bl_idle_big_driver, bl_idle_state_match, 1);
+        if (ret < 0)
+                goto out_uninit_big;
+
+        /* Start at index 1, index 0 standard WFI */
+        ret = dt_init_idle_driver(&bl_idle_little_driver,
+                                  bl_idle_state_match, 1);
+        if (ret < 0)
+                goto out_uninit_big;
+
         ret = cpuidle_register(&bl_idle_little_driver, NULL);
         if (ret)
                 goto out_uninit_big;