[PATCH v7 8/8] drivers: cpuidle: initialize Exynos driver through DT
From: Lina Iyer <hidden>
Date: 2014-08-15 21:12:33
Also in:
linux-devicetree, linux-pm
On Wed, Aug 13, 2014 at 04:52:07PM +0100, Lorenzo Pieralisi wrote:
quoted hunk ↗ jump to hunk
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 Exynos CPUidle driver to dynamically initialize idle states data through the updated device tree source files. Cc: Chander Kashyap <redacted> Cc: Kukjin Kim <redacted> Cc: Tomasz Figa <redacted> Signed-off-by: Lorenzo Pieralisi <redacted> --- arch/arm/boot/dts/exynos4210.dtsi | 11 +++++++++++ arch/arm/boot/dts/exynos5250.dtsi | 11 +++++++++++ drivers/cpuidle/Kconfig.arm | 1 + drivers/cpuidle/cpuidle-exynos.c | 27 ++++++++++++++++++++++++--- 4 files changed, 47 insertions(+), 3 deletions(-)diff --git a/arch/arm/boot/dts/exynos4210.dtsi b/arch/arm/boot/dts/exynos4210.dtsi index eab7c7b..69fd1a0 100644 --- a/arch/arm/boot/dts/exynos4210.dtsi +++ b/arch/arm/boot/dts/exynos4210.dtsi@@ -48,12 +48,23 @@device_type = "cpu"; compatible = "arm,cortex-a9"; reg = <0x900>; + cpu-idle-states = <&CLUSTER_SLEEP_0>; }; cpu at 901 { device_type = "cpu"; compatible = "arm,cortex-a9"; reg = <0x901>; + cpu-idle-states = <&CLUSTER_SLEEP_0>; + }; + + idle-states { + CLUSTER_SLEEP_0: cluster-sleep-0 { + compatible = "arm,idle-state"; + entry-latency-us = <1000>; + exit-latency-us = <300>; + min-residency-us = <100000>; + }; }; };diff --git a/arch/arm/boot/dts/exynos5250.dtsi b/arch/arm/boot/dts/exynos5250.dtsi index 492e1ef..3a758ff 100644 --- a/arch/arm/boot/dts/exynos5250.dtsi +++ b/arch/arm/boot/dts/exynos5250.dtsi@@ -63,12 +63,23 @@compatible = "arm,cortex-a15"; reg = <0>; clock-frequency = <1700000000>; + cpu-idle-states = <&CLUSTER_SLEEP_0>; }; cpu at 1 { device_type = "cpu"; compatible = "arm,cortex-a15"; reg = <1>; clock-frequency = <1700000000>; + cpu-idle-states = <&CLUSTER_SLEEP_0>; + }; + + idle-states { + CLUSTER_SLEEP_0: cluster-sleep-0 { + compatible = "arm,idle-state"; + entry-latency-us = <1000>; + exit-latency-us = <300>; + min-residency-us = <100000>; + }; }; };diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm index e339c7f..04cc229 100644 --- a/drivers/cpuidle/Kconfig.arm +++ b/drivers/cpuidle/Kconfig.arm@@ -55,6 +55,7 @@ config ARM_AT91_CPUIDLEconfig ARM_EXYNOS_CPUIDLE bool "Cpu Idle Driver for the Exynos processors" depends on ARCH_EXYNOS + select DT_IDLE_STATES help Select this to enable cpuidle for Exynos processorsdiff --git a/drivers/cpuidle/cpuidle-exynos.c b/drivers/cpuidle/cpuidle-exynos.c index ba9b34b..6dff982 100644 --- a/drivers/cpuidle/cpuidle-exynos.c +++ b/drivers/cpuidle/cpuidle-exynos.c@@ -13,11 +13,14 @@#include <linux/export.h> #include <linux/module.h> #include <linux/platform_device.h> +#include <linux/slab.h> #include <asm/proc-fns.h> #include <asm/suspend.h> #include <asm/cpuidle.h> +#include "dt_idle_states.h" + static void (*exynos_enter_aftr)(void); static int exynos_enter_lowpower(struct cpuidle_device *dev,@@ -58,17 +61,35 @@ static struct cpuidle_driver exynos_idle_driver = {static int exynos_cpuidle_probe(struct platform_device *pdev) { - int ret; + int ret, i; + struct cpuidle_driver *drv = &exynos_idle_driver; exynos_enter_aftr = (void *)(pdev->dev.platform_data); - ret = cpuidle_register(&exynos_idle_driver, NULL); + drv->cpumask = kzalloc(cpumask_size(), GFP_KERNEL); + if (!drv->cpumask) + return -ENOMEM;
drv->cpumask would not have any cpu set. I dont see it being modified elsewhere.
+
+ /* Start at index 1, index 0 standard WFI */
+ ret = dt_init_idle_driver(drv, 1);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "failed to initialize idle states\n");
+ goto free_mem;
+ }
+
+ for (i = 1; i < drv->state_count; i++)
+ drv->states[i].enter = exynos_enter_lowpower;
+
+ ret = cpuidle_register(drv, NULL);
if (ret) {
dev_err(&pdev->dev, "failed to register cpuidle driver\n");
- return ret;
+ goto free_mem;
}
return 0;
+free_mem:
+ kfree(drv->cpumask);
+ return ret;
}
static struct platform_driver exynos_cpuidle_driver = {
--
1.9.1