Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / mach-keystone / pm_domain.c

diff --git a/kernel/arch/arm/mach-keystone/pm_domain.c b/kernel/arch/arm/mach-keystone/pm_domain.c
new file mode 100644 (file)
index 0000000..41bebfd
--- /dev/null
+++ b/kernel/arch/arm/mach-keystone/pm_domain.c
@@ -0,0 +1,80 @@
+/*
+ * PM domain driver for Keystone2 devices
+ *
+ * Copyright 2013 Texas Instruments, Inc.
+ *     Santosh Shilimkar <santosh.shillimkar@ti.com>
+ *
+ * Based on Kevins work on DAVINCI SOCs
+ *     Kevin Hilman <khilman@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/pm_runtime.h>
+#include <linux/pm_clock.h>
+#include <linux/platform_device.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+
+#ifdef CONFIG_PM
+static int keystone_pm_runtime_suspend(struct device *dev)
+{
+       int ret;
+
+       dev_dbg(dev, "%s\n", __func__);
+
+       ret = pm_generic_runtime_suspend(dev);
+       if (ret)
+               return ret;
+
+       ret = pm_clk_suspend(dev);
+       if (ret) {
+               pm_generic_runtime_resume(dev);
+               return ret;
+       }
+
+       return 0;
+}
+
+static int keystone_pm_runtime_resume(struct device *dev)
+{
+       dev_dbg(dev, "%s\n", __func__);
+
+       pm_clk_resume(dev);
+
+       return pm_generic_runtime_resume(dev);
+}
+#endif
+
+static struct dev_pm_domain keystone_pm_domain = {
+       .ops = {
+               SET_RUNTIME_PM_OPS(keystone_pm_runtime_suspend,
+                                  keystone_pm_runtime_resume, NULL)
+               USE_PLATFORM_PM_SLEEP_OPS
+       },
+};
+
+static struct pm_clk_notifier_block platform_domain_notifier = {
+       .pm_domain = &keystone_pm_domain,
+};
+
+static const struct of_device_id of_keystone_table[] = {
+       {.compatible = "ti,keystone"},
+       { /* end of list */ },
+};
+
+int __init keystone_pm_runtime_init(void)
+{
+       struct device_node *np;
+
+       np = of_find_matching_node(NULL, of_keystone_table);
+       if (!np)
+               return 0;
+
+       pm_clk_add_notifier(&platform_bus_type, &platform_domain_notifier);
+
+       return 0;
+}