[PATCH 8/8] ARM: keystone: add PM bus support for clock management
Santosh Shilimkar
santosh.shilimkar at ti.com
Mon Aug 5 12:12:27 EDT 2013
Add runtime PM core support to Keystone SOCs by using the pm_clk
infrastructure of the PM core. Patch is based on Kevin's pm_domain
work on DaVinci SOCs.
Keystone SOC doesn't have depedency to enable clocks in early
in the boot and hence the clock and PM bus initialisation is done
at subsystem_init() level at least for now.
Cc: Kevin Hilman <khilman at linaro.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar at ti.com>
---
drivers/bus/Makefile | 2 ++
drivers/bus/keystone_pm_bus.c | 68 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 70 insertions(+)
create mode 100644 drivers/bus/keystone_pm_bus.c
diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile
index 8947bdd..cb7f304 100644
--- a/drivers/bus/Makefile
+++ b/drivers/bus/Makefile
@@ -10,3 +10,5 @@ obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o
obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o
# CCI cache coherent interconnect for ARM platforms
obj-$(CONFIG_ARM_CCI) += arm-cci.o
+# PM bus driver for Keystone SOCs
+obj-$(CONFIG_ARCH_KEYSTONE) += keystone_pm_bus.o
diff --git a/drivers/bus/keystone_pm_bus.c b/drivers/bus/keystone_pm_bus.c
new file mode 100644
index 0000000..cbb4000
--- /dev/null
+++ b/drivers/bus/keystone_pm_bus.c
@@ -0,0 +1,68 @@
+/*
+ * PM Bus driver for Keystone2 devices
+ *
+ * Copyright 2013 Texas Instruments, Inc.
+ * Santosh Shilimkar <santosh.shillimkar at ti.com>
+ *
+ * Based on Kevins work on DAVINCI SOCs
+ * Kevin Hilman <khilman at ti.com>
+ *
+ * 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>
+
+#ifdef CONFIG_PM_RUNTIME
+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_bus = {
+ .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_bus_notifier = {
+ .pm_domain = &keystone_pm_bus,
+};
+
+int __init keystone_pm_runtime_init(void)
+{
+ pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
+
+ return 0;
+}
+subsystem_init(keystone_pm_runtime_init);
--
1.7.9.5
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