Commit 4a55026f authored by Francesco VIRLINZI's avatar Francesco VIRLINZI Committed by Paul Mundt

sh: clkfwk: Add resume from hibernation support.

This patch adds PM support to the clock framework.
With this, resume from hibernation is properly supported.
Signed-off-by: default avatarFrancesco Virlinzi <francesco.virlinzi@st.com>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent d680c76e
...@@ -20,6 +20,8 @@ ...@@ -20,6 +20,8 @@
#include <linux/mutex.h> #include <linux/mutex.h>
#include <linux/list.h> #include <linux/list.h>
#include <linux/kref.h> #include <linux/kref.h>
#include <linux/kobject.h>
#include <linux/sysdev.h>
#include <linux/seq_file.h> #include <linux/seq_file.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
...@@ -358,6 +360,68 @@ static int show_clocks(char *buf, char **start, off_t off, ...@@ -358,6 +360,68 @@ static int show_clocks(char *buf, char **start, off_t off,
return p - buf; return p - buf;
} }
#ifdef CONFIG_PM
static int clks_sysdev_suspend(struct sys_device *dev, pm_message_t state)
{
static pm_message_t prev_state;
struct clk *clkp;
switch (state.event) {
case PM_EVENT_ON:
/* Resumeing from hibernation */
if (prev_state.event == PM_EVENT_FREEZE) {
list_for_each_entry(clkp, &clock_list, node)
if (likely(clkp->ops)) {
if (likely(clkp->ops->set_parent))
clkp->ops->set_parent(clkp,
clkp->parent);
if (likely(clkp->ops->set_rate))
clkp->ops->set_rate(clkp,
clkp->rate, NO_CHANGE);
else if (likely(clkp->ops->recalc))
clkp->ops->recalc(clkp);
}
}
break;
case PM_EVENT_FREEZE:
break;
case PM_EVENT_SUSPEND:
break;
}
prev_state = state;
return 0;
}
static int clks_sysdev_resume(struct sys_device *dev)
{
return clks_sysdev_suspend(dev, PMSG_ON);
}
static struct sysdev_class clks_sysdev_class = {
.name = "clks",
};
static struct sysdev_driver clks_sysdev_driver = {
.suspend = clks_sysdev_suspend,
.resume = clks_sysdev_resume,
};
static struct sys_device clks_sysdev_dev = {
.cls = &clks_sysdev_class,
};
static int __init clk_sysdev_init(void)
{
sysdev_class_register(&clks_sysdev_class);
sysdev_driver_register(&clks_sysdev_class, &clks_sysdev_driver);
sysdev_register(&clks_sysdev_dev);
return 0;
}
subsys_initcall(clk_sysdev_init);
#endif
int __init clk_init(void) int __init clk_init(void)
{ {
int i, ret = 0; int i, ret = 0;
......
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