bus: ti-sysc: Add suspend and resume handling

This allows us to idle the module on suspend after the children
are suspended.

Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 3ffe544..2bb0d00 100644 (file)
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -58,6 +58,7 @@ static const char * const clock_names[] = { "fck", "ick", };
  * @cfg: interconnect target module configuration
  * @name: name if available
  * @revision: interconnect target module revision
+ * @needs_resume: runtime resume needed on resume from suspend
  */
 struct sysc {
        struct device *dev;
@@ -71,6 +72,8 @@ struct sysc {
        struct sysc_config cfg;
        const char *name;
        u32 revision;
+       bool enabled;
+       bool needs_resume;
 };
 
 static u32 sysc_read(struct sysc *ddata, int offset)
@@ -497,7 +500,38 @@ static int __maybe_unused sysc_runtime_resume(struct device *dev)
        return 0;
 }
 
+#ifdef CONFIG_PM_SLEEP
+static int sysc_suspend(struct device *dev)
+{
+       struct sysc *ddata;
+
+       ddata = dev_get_drvdata(dev);
+
+       if (!ddata->enabled)
+               return 0;
+
+       ddata->needs_resume = true;
+
+       return sysc_runtime_suspend(dev);
+}
+
+static int sysc_resume(struct device *dev)
+{
+       struct sysc *ddata;
+
+       ddata = dev_get_drvdata(dev);
+       if (ddata->needs_resume) {
+               ddata->needs_resume = false;
+
+               return sysc_runtime_resume(dev);
+       }
+
+       return 0;
+}
+#endif
+
 static const struct dev_pm_ops sysc_pm_ops = {
+       SET_SYSTEM_SLEEP_PM_OPS(sysc_suspend, sysc_resume)
        SET_RUNTIME_PM_OPS(sysc_runtime_suspend,
                           sysc_runtime_resume,
                           NULL)