OMAP: PM: Add new sysfs option for disabling clocks when entering idle

There are drivers that are not disabling their clocks (gpio &
uart). These clocks need to be disabled if retention/off state is
wanted when idling. Before disabling them in idle loop this option
needs to be checked.
Signed-off-by: Jouni Hogander <jouni.hogander@nokia.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/pm.c

@@ -31,30 +31,51 @@
 #include "pm.h"
 
 unsigned short enable_dyn_sleep;
+unsigned short clocks_off_while_idle;
 atomic_t sleep_block = ATOMIC_INIT(0);
 
+static ssize_t idle_show(struct kobject *, struct kobj_attribute *, char *);
+static ssize_t idle_store(struct kobject *k, struct kobj_attribute *,
+			  const char *buf, size_t n);
+
+static struct kobj_attribute sleep_while_idle_attr =
+	__ATTR(sleep_while_idle, 0644, idle_show, idle_store);
+
+static struct kobj_attribute clocks_off_while_idle_attr =
+	__ATTR(clocks_off_while_idle, 0644, idle_show, idle_store);
+
 static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
 			 char *buf)
 {
-	return sprintf(buf, "%hu\n", enable_dyn_sleep);
+	if (attr == &sleep_while_idle_attr)
+		return sprintf(buf, "%hu\n", enable_dyn_sleep);
+	else if (attr == &clocks_off_while_idle_attr)
+		return sprintf(buf, "%hu\n", clocks_off_while_idle);
+	else
+		return -EINVAL;
 }
 
 static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
 			  const char *buf, size_t n)
 {
 	unsigned short value;
+
 	if (sscanf(buf, "%hu", &value) != 1 ||
 	    (value != 0 && value != 1)) {
-		printk(KERN_ERR "idle_sleep_store: Invalid value\n");
+		printk(KERN_ERR "idle_store: Invalid value\n");
 		return -EINVAL;
 	}
-	enable_dyn_sleep = value;
+
+	if (attr == &sleep_while_idle_attr)
+		enable_dyn_sleep = value;
+	else if (attr == &clocks_off_while_idle_attr)
+		clocks_off_while_idle = value;
+	else
+		return -EINVAL;
+
 	return n;
 }
 
-static struct kobj_attribute sleep_while_idle_attr =
-	__ATTR(sleep_while_idle, 0644, idle_show, idle_store);
-
 void omap2_block_sleep(void)
 {
 	atomic_inc(&sleep_block);
@@ -86,6 +107,10 @@ int __init omap_pm_init(void)
 	error = sysfs_create_file(power_kobj, &sleep_while_idle_attr.attr);
 	if (error)
 		printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
+	error = sysfs_create_file(power_kobj,
+				  &clocks_off_while_idle_attr.attr);
+	if (error)
+		printk(KERN_ERR "sysfs_create_file failed: %d\n", error);
 
 	return error;
 }

arch/arm/mach-omap2/pm.h

@@ -17,6 +17,7 @@ extern int omap2_pm_init(void);
 extern int omap3_pm_init(void);
 
 extern unsigned short enable_dyn_sleep;
+extern unsigned short clocks_off_while_idle;
 extern atomic_t sleep_block;
 
 #ifdef CONFIG_PM_DEBUG