On 7/7/2011 8:50 AM, Lorenzo Pieralisi wrote:
From: Colin Cross<ccr...@android.com>

During some CPU power modes entered during idle, hotplug and
suspend, peripherals located in the CPU power domain, such as
the GIC and VFP, may be powered down.  Add a notifier chain
that allows drivers for those peripherals to be notified
before and after they may be reset.

Signed-off-by: Colin Cross<ccr...@android.com>
Tested-by: Kevin Hilman<khil...@ti.com>
---
  arch/arm/Kconfig              |    7 ++
  arch/arm/include/asm/cpu_pm.h |   54 ++++++++++++
  arch/arm/kernel/Makefile      |    1 +
  arch/arm/kernel/cpu_pm.c      |  181 +++++++++++++++++++++++++++++++++++++++++
  4 files changed, 243 insertions(+), 0 deletions(-)
  create mode 100644 arch/arm/include/asm/cpu_pm.h
  create mode 100644 arch/arm/kernel/cpu_pm.c

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9adc278..356f266 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -183,6 +183,13 @@ config FIQ
  config ARCH_MTD_XIP
        bool

+config ARCH_USES_CPU_PM
+       bool
+
+config CPU_PM
+       def_bool y
+       depends on ARCH_USES_CPU_PM&&  (PM || CPU_IDLE)
+
  config VECTORS_BASE
        hex
        default 0xffff0000 if MMU || CPU_HIGH_VECTOR
diff --git a/arch/arm/include/asm/cpu_pm.h b/arch/arm/include/asm/cpu_pm.h
new file mode 100644
index 0000000..b4bb715
--- /dev/null
+++ b/arch/arm/include/asm/cpu_pm.h
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2011 Google, Inc.
+ *
+ * Author:
+ *     Colin Cross<ccr...@android.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _ASMARM_CPU_PM_H
+#define _ASMARM_CPU_PM_H
+
+#include<linux/kernel.h>
+#include<linux/notifier.h>
+
+/* Event codes passed as unsigned long val to notifier calls */
+enum cpu_pm_event {
+       /* A single cpu is entering a low power state */
+       CPU_PM_ENTER,
+
+       /* A single cpu failed to enter a low power state */
+       CPU_PM_ENTER_FAILED,
+
+       /* A single cpu is exiting a low power state */
+       CPU_PM_EXIT,
+
+       /* A cpu power domain is entering a low power state */
+       CPU_COMPLEX_PM_ENTER,
+
+       /* A cpu power domain failed to enter a low power state */
+       CPU_COMPLEX_PM_ENTER_FAILED,
+
+       /* A cpu power domain is exiting a low power state */
+       CPU_COMPLEX_PM_EXIT,
+};
+
+int cpu_pm_register_notifier(struct notifier_block *nb);
+int cpu_pm_unregister_notifier(struct notifier_block *nb);
+
+int cpu_pm_enter(void);
+int cpu_pm_exit(void);
+
+int cpu_complex_pm_enter(void);
+int cpu_complex_pm_exit(void);
+
Can "cpu_complex_pm*" renamed to "cpu_cluster_pm*" as discussed
earlier on the list.

Regards
Santosh

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