Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 929 insertions, 0 deletions

diff --git a/kernel/arch/arm/mach-omap2/omap_device.c b/kernel/arch/arm/mach-omap2/omap_device.c
new file mode 100644
index 000000000..166b18f51
--- /dev/null
+++ b/kernel/arch/arm/mach-omap2/omap_device.c
@@ -0,0 +1,929 @@
+/*
+ * omap_device implementation
+ *
+ * Copyright (C) 2009-2010 Nokia Corporation
+ * Paul Walmsley, Kevin Hilman
+ *
+ * Developed in collaboration with (alphabetical order): Benoit
+ * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
+ * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
+ * Woodruff
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This code provides a consistent interface for OMAP device drivers
+ * to control power management and interconnect properties of their
+ * devices.
+ *
+ * In the medium- to long-term, this code should be implemented as a
+ * proper omap_bus/omap_device in Linux, no more platform_data func
+ * pointers
+ *
+ *
+ */
+#undef DEBUG
+
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/notifier.h>
+
+#include "common.h"
+#include "soc.h"
+#include "omap_device.h"
+#include "omap_hwmod.h"
+
+/* Private functions */
+
+static void _add_clkdev(struct omap_device *od, const char *clk_alias,
+		       const char *clk_name)
+{
+	struct clk *r;
+	struct clk_lookup *l;
+
+	if (!clk_alias || !clk_name)
+		return;
+
+	dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);
+
+	r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
+	if (!IS_ERR(r)) {
+		dev_dbg(&od->pdev->dev,
+			 "alias %s already exists\n", clk_alias);
+		clk_put(r);
+		return;
+	}
+
+	r = clk_get(NULL, clk_name);
+	if (IS_ERR(r)) {
+		dev_err(&od->pdev->dev,
+			"clk_get for %s failed\n", clk_name);
+		return;
+	}
+
+	l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev));
+	if (!l) {
+		dev_err(&od->pdev->dev,
+			"clkdev_alloc for %s failed\n", clk_alias);
+		return;
+	}
+
+	clkdev_add(l);
+}
+
+/**
+ * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
+ * and main clock
+ * @od: struct omap_device *od
+ * @oh: struct omap_hwmod *oh
+ *
+ * For the main clock and every optional clock present per hwmod per
+ * omap_device, this function adds an entry in the clkdev table of the
+ * form <dev-id=dev_name, con-id=role> if it does not exist already.
+ *
+ * The function is called from inside omap_device_build_ss(), after
+ * omap_device_register.
+ *
+ * This allows drivers to get a pointer to its optional clocks based on its role
+ * by calling clk_get(<dev*>, <role>).
+ * In the case of the main clock, a "fck" alias is used.
+ *
+ * No return value.
+ */
+static void _add_hwmod_clocks_clkdev(struct omap_device *od,
+				     struct omap_hwmod *oh)
+{
+	int i;
+
+	_add_clkdev(od, "fck", oh->main_clk);
+
+	for (i = 0; i < oh->opt_clks_cnt; i++)
+		_add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
+}
+
+
+/**
+ * omap_device_build_from_dt - build an omap_device with multiple hwmods
+ * @pdev_name: name of the platform_device driver to use
+ * @pdev_id: this platform_device's connection ID
+ * @oh: ptr to the single omap_hwmod that backs this omap_device
+ * @pdata: platform_data ptr to associate with the platform_device
+ * @pdata_len: amount of memory pointed to by @pdata
+ *
+ * Function for building an omap_device already registered from device-tree
+ *
+ * Returns 0 or PTR_ERR() on error.
+ */
+static int omap_device_build_from_dt(struct platform_device *pdev)
+{
+	struct omap_hwmod **hwmods;
+	struct omap_device *od;
+	struct omap_hwmod *oh;
+	struct device_node *node = pdev->dev.of_node;
+	const char *oh_name;
+	int oh_cnt, i, ret = 0;
+	bool device_active = false;
+
+	oh_cnt = of_property_count_strings(node, "ti,hwmods");
+	if (oh_cnt <= 0) {
+		dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
+		return -ENODEV;
+	}
+
+	hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
+	if (!hwmods) {
+		ret = -ENOMEM;
+		goto odbfd_exit;
+	}
+
+	for (i = 0; i < oh_cnt; i++) {
+		of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
+		oh = omap_hwmod_lookup(oh_name);
+		if (!oh) {
+			dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
+				oh_name);
+			ret = -EINVAL;
+			goto odbfd_exit1;
+		}
+		hwmods[i] = oh;
+		if (oh->flags & HWMOD_INIT_NO_IDLE)
+			device_active = true;
+	}
+
+	od = omap_device_alloc(pdev, hwmods, oh_cnt);
+	if (IS_ERR(od)) {
+		dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
+			oh_name);
+		ret = PTR_ERR(od);
+		goto odbfd_exit1;
+	}
+
+	/* Fix up missing resource names */
+	for (i = 0; i < pdev->num_resources; i++) {
+		struct resource *r = &pdev->resource[i];
+
+		if (r->name == NULL)
+			r->name = dev_name(&pdev->dev);
+	}
+
+	pdev->dev.pm_domain = &omap_device_pm_domain;
+
+	if (device_active) {
+		omap_device_enable(pdev);
+		pm_runtime_set_active(&pdev->dev);
+	}
+
+odbfd_exit1:
+	kfree(hwmods);
+odbfd_exit:
+	/* if data/we are at fault.. load up a fail handler */
+	if (ret)
+		pdev->dev.pm_domain = &omap_device_fail_pm_domain;
+
+	return ret;
+}
+
+static int _omap_device_notifier_call(struct notifier_block *nb,
+				      unsigned long event, void *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct omap_device *od;
+
+	switch (event) {
+	case BUS_NOTIFY_DEL_DEVICE:
+		if (pdev->archdata.od)
+			omap_device_delete(pdev->archdata.od);
+		break;
+	case BUS_NOTIFY_ADD_DEVICE:
+		if (pdev->dev.of_node)
+			omap_device_build_from_dt(pdev);
+		omap_auxdata_legacy_init(dev);
+		/* fall through */
+	default:
+		od = to_omap_device(pdev);
+		if (od)
+			od->_driver_status = event;
+	}
+
+	return NOTIFY_DONE;
+}
+
+/**
+ * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
+ * @od: struct omap_device *od
+ *
+ * Enable all underlying hwmods.  Returns 0.
+ */
+static int _omap_device_enable_hwmods(struct omap_device *od)
+{
+	int i;
+
+	for (i = 0; i < od->hwmods_cnt; i++)
+		omap_hwmod_enable(od->hwmods[i]);
+
+	/* XXX pass along return value here? */
+	return 0;
+}
+
+/**
+ * _omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
+ * @od: struct omap_device *od
+ *
+ * Idle all underlying hwmods.  Returns 0.
+ */
+static int _omap_device_idle_hwmods(struct omap_device *od)
+{
+	int i;
+
+	for (i = 0; i < od->hwmods_cnt; i++)
+		omap_hwmod_idle(od->hwmods[i]);
+
+	/* XXX pass along return value here? */
+	return 0;
+}
+
+/* Public functions for use by core code */
+
+/**
+ * omap_device_get_context_loss_count - get lost context count
+ * @od: struct omap_device *
+ *
+ * Using the primary hwmod, query the context loss count for this
+ * device.
+ *
+ * Callers should consider context for this device lost any time this
+ * function returns a value different than the value the caller got
+ * the last time it called this function.
+ *
+ * If any hwmods exist for the omap_device assoiated with @pdev,
+ * return the context loss counter for that hwmod, otherwise return
+ * zero.
+ */
+int omap_device_get_context_loss_count(struct platform_device *pdev)
+{
+	struct omap_device *od;
+	u32 ret = 0;
+
+	od = to_omap_device(pdev);
+
+	if (od->hwmods_cnt)
+		ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);
+
+	return ret;
+}
+
+/**
+ * omap_device_count_resources - count number of struct resource entries needed
+ * @od: struct omap_device *
+ * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
+ *
+ * Count the number of struct resource entries needed for this
+ * omap_device @od.  Used by omap_device_build_ss() to determine how
+ * much memory to allocate before calling
+ * omap_device_fill_resources().  Returns the count.
+ */
+static int omap_device_count_resources(struct omap_device *od,
+				       unsigned long flags)
+{
+	int c = 0;
+	int i;
+
+	for (i = 0; i < od->hwmods_cnt; i++)
+		c += omap_hwmod_count_resources(od->hwmods[i], flags);
+
+	pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n",
+		 od->pdev->name, c, od->hwmods_cnt);
+
+	return c;
+}
+
+/**
+ * omap_device_fill_resources - fill in array of struct resource
+ * @od: struct omap_device *
+ * @res: pointer to an array of struct resource to be filled in
+ *
+ * Populate one or more empty struct resource pointed to by @res with
+ * the resource data for this omap_device @od.  Used by
+ * omap_device_build_ss() after calling omap_device_count_resources().
+ * Ideally this function would not be needed at all.  If omap_device
+ * replaces platform_device, then we can specify our own
+ * get_resource()/ get_irq()/etc functions that use the underlying
+ * omap_hwmod information.  Or if platform_device is extended to use
+ * subarchitecture-specific function pointers, the various
+ * platform_device functions can simply call omap_device internal
+ * functions to get device resources.  Hacking around the existing
+ * platform_device code wastes memory.  Returns 0.
+ */
+static int omap_device_fill_resources(struct omap_device *od,
+				      struct resource *res)
+{
+	int i, r;
+
+	for (i = 0; i < od->hwmods_cnt; i++) {
+		r = omap_hwmod_fill_resources(od->hwmods[i], res);
+		res += r;
+	}
+
+	return 0;
+}
+
+/**
+ * _od_fill_dma_resources - fill in array of struct resource with dma resources
+ * @od: struct omap_device *
+ * @res: pointer to an array of struct resource to be filled in
+ *
+ * Populate one or more empty struct resource pointed to by @res with
+ * the dma resource data for this omap_device @od.  Used by
+ * omap_device_alloc() after calling omap_device_count_resources().
+ *
+ * Ideally this function would not be needed at all.  If we have
+ * mechanism to get dma resources from DT.
+ *
+ * Returns 0.
+ */
+static int _od_fill_dma_resources(struct omap_device *od,
+				      struct resource *res)
+{
+	int i, r;
+
+	for (i = 0; i < od->hwmods_cnt; i++) {
+		r = omap_hwmod_fill_dma_resources(od->hwmods[i], res);
+		res += r;
+	}
+
+	return 0;
+}
+
+/**
+ * omap_device_alloc - allocate an omap_device
+ * @pdev: platform_device that will be included in this omap_device
+ * @oh: ptr to the single omap_hwmod that backs this omap_device
+ * @pdata: platform_data ptr to associate with the platform_device
+ * @pdata_len: amount of memory pointed to by @pdata
+ *
+ * Convenience function for allocating an omap_device structure and filling
+ * hwmods, and resources.
+ *
+ * Returns an struct omap_device pointer or ERR_PTR() on error;
+ */
+struct omap_device *omap_device_alloc(struct platform_device *pdev,
+					struct omap_hwmod **ohs, int oh_cnt)
+{
+	int ret = -ENOMEM;
+	struct omap_device *od;
+	struct resource *res = NULL;
+	int i, res_count;
+	struct omap_hwmod **hwmods;
+
+	od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
+	if (!od) {
+		ret = -ENOMEM;
+		goto oda_exit1;
+	}
+	od->hwmods_cnt = oh_cnt;
+
+	hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
+	if (!hwmods)
+		goto oda_exit2;
+
+	od->hwmods = hwmods;
+	od->pdev = pdev;
+
+	/*
+	 * Non-DT Boot:
+	 *   Here, pdev->num_resources = 0, and we should get all the
+	 *   resources from hwmod.
+	 *
+	 * DT Boot:
+	 *   OF framework will construct the resource structure (currently
+	 *   does for MEM & IRQ resource) and we should respect/use these
+	 *   resources, killing hwmod dependency.
+	 *   If pdev->num_resources > 0, we assume that MEM & IRQ resources
+	 *   have been allocated by OF layer already (through DTB).
+	 *   As preparation for the future we examine the OF provided resources
+	 *   to see if we have DMA resources provided already. In this case
+	 *   there is no need to update the resources for the device, we use the
+	 *   OF provided ones.
+	 *
+	 * TODO: Once DMA resource is available from OF layer, we should
+	 *   kill filling any resources from hwmod.
+	 */
+	if (!pdev->num_resources) {
+		/* Count all resources for the device */
+		res_count = omap_device_count_resources(od, IORESOURCE_IRQ |
+							    IORESOURCE_DMA |
+							    IORESOURCE_MEM);
+	} else {
+		/* Take a look if we already have DMA resource via DT */
+		for (i = 0; i < pdev->num_resources; i++) {
+			struct resource *r = &pdev->resource[i];
+
+			/* We have it, no need to touch the resources */
+			if (r->flags == IORESOURCE_DMA)
+				goto have_everything;
+		}
+		/* Count only DMA resources for the device */
+		res_count = omap_device_count_resources(od, IORESOURCE_DMA);
+		/* The device has no DMA resource, no need for update */
+		if (!res_count)
+			goto have_everything;
+
+		res_count += pdev->num_resources;
+	}
+
+	/* Allocate resources memory to account for new resources */
+	res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
+	if (!res)
+		goto oda_exit3;
+
+	if (!pdev->num_resources) {
+		dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n",
+			__func__, res_count);
+		omap_device_fill_resources(od, res);
+	} else {
+		dev_dbg(&pdev->dev,
+			"%s: appending %d DMA resources from hwmod\n",
+			__func__, res_count - pdev->num_resources);
+		memcpy(res, pdev->resource,
+		       sizeof(struct resource) * pdev->num_resources);
+		_od_fill_dma_resources(od, &res[pdev->num_resources]);
+	}
+
+	ret = platform_device_add_resources(pdev, res, res_count);
+	kfree(res);
+
+	if (ret)
+		goto oda_exit3;
+
+have_everything:
+	pdev->archdata.od = od;
+
+	for (i = 0; i < oh_cnt; i++) {
+		hwmods[i]->od = od;
+		_add_hwmod_clocks_clkdev(od, hwmods[i]);
+	}
+
+	return od;
+
+oda_exit3:
+	kfree(hwmods);
+oda_exit2:
+	kfree(od);
+oda_exit1:
+	dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);
+
+	return ERR_PTR(ret);
+}
+
+void omap_device_delete(struct omap_device *od)
+{
+	if (!od)
+		return;
+
+	od->pdev->archdata.od = NULL;
+	kfree(od->hwmods);
+	kfree(od);
+}
+
+/**
+ * omap_device_build - build and register an omap_device with one omap_hwmod
+ * @pdev_name: name of the platform_device driver to use
+ * @pdev_id: this platform_device's connection ID
+ * @oh: ptr to the single omap_hwmod that backs this omap_device
+ * @pdata: platform_data ptr to associate with the platform_device
+ * @pdata_len: amount of memory pointed to by @pdata
+ *
+ * Convenience function for building and registering a single
+ * omap_device record, which in turn builds and registers a
+ * platform_device record.  See omap_device_build_ss() for more
+ * information.  Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
+ * passes along the return value of omap_device_build_ss().
+ */
+struct platform_device __init *omap_device_build(const char *pdev_name,
+						 int pdev_id,
+						 struct omap_hwmod *oh,
+						 void *pdata, int pdata_len)
+{
+	struct omap_hwmod *ohs[] = { oh };
+
+	if (!oh)
+		return ERR_PTR(-EINVAL);
+
+	return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
+				    pdata_len);
+}
+
+/**
+ * omap_device_build_ss - build and register an omap_device with multiple hwmods
+ * @pdev_name: name of the platform_device driver to use
+ * @pdev_id: this platform_device's connection ID
+ * @oh: ptr to the single omap_hwmod that backs this omap_device
+ * @pdata: platform_data ptr to associate with the platform_device
+ * @pdata_len: amount of memory pointed to by @pdata
+ *
+ * Convenience function for building and registering an omap_device
+ * subsystem record.  Subsystem records consist of multiple
+ * omap_hwmods.  This function in turn builds and registers a
+ * platform_device record.  Returns an ERR_PTR() on error, or passes
+ * along the return value of omap_device_register().
+ */
+struct platform_device __init *omap_device_build_ss(const char *pdev_name,
+						    int pdev_id,
+						    struct omap_hwmod **ohs,
+						    int oh_cnt, void *pdata,
+						    int pdata_len)
+{
+	int ret = -ENOMEM;
+	struct platform_device *pdev;
+	struct omap_device *od;
+
+	if (!ohs || oh_cnt == 0 || !pdev_name)
+		return ERR_PTR(-EINVAL);
+
+	if (!pdata && pdata_len > 0)
+		return ERR_PTR(-EINVAL);
+
+	pdev = platform_device_alloc(pdev_name, pdev_id);
+	if (!pdev) {
+		ret = -ENOMEM;
+		goto odbs_exit;
+	}
+
+	/* Set the dev_name early to allow dev_xxx in omap_device_alloc */
+	if (pdev->id != -1)
+		dev_set_name(&pdev->dev, "%s.%d", pdev->name,  pdev->id);
+	else
+		dev_set_name(&pdev->dev, "%s", pdev->name);
+
+	od = omap_device_alloc(pdev, ohs, oh_cnt);
+	if (IS_ERR(od))
+		goto odbs_exit1;
+
+	ret = platform_device_add_data(pdev, pdata, pdata_len);
+	if (ret)
+		goto odbs_exit2;
+
+	ret = omap_device_register(pdev);
+	if (ret)
+		goto odbs_exit2;
+
+	return pdev;
+
+odbs_exit2:
+	omap_device_delete(od);
+odbs_exit1:
+	platform_device_put(pdev);
+odbs_exit:
+
+	pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);
+
+	return ERR_PTR(ret);
+}
+
+#ifdef CONFIG_PM
+static int _od_runtime_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	int ret;
+
+	ret = pm_generic_runtime_suspend(dev);
+
+	if (!ret)
+		omap_device_idle(pdev);
+
+	return ret;
+}
+
+static int _od_runtime_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	omap_device_enable(pdev);
+
+	return pm_generic_runtime_resume(dev);
+}
+
+static int _od_fail_runtime_suspend(struct device *dev)
+{
+	dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
+	return -ENODEV;
+}
+
+static int _od_fail_runtime_resume(struct device *dev)
+{
+	dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
+	return -ENODEV;
+}
+
+#endif
+
+#ifdef CONFIG_SUSPEND
+static int _od_suspend_noirq(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct omap_device *od = to_omap_device(pdev);
+	int ret;
+
+	/* Don't attempt late suspend on a driver that is not bound */
+	if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
+		return 0;
+
+	ret = pm_generic_suspend_noirq(dev);
+
+	if (!ret && !pm_runtime_status_suspended(dev)) {
+		if (pm_generic_runtime_suspend(dev) == 0) {
+			pm_runtime_set_suspended(dev);
+			omap_device_idle(pdev);
+			od->flags |= OMAP_DEVICE_SUSPENDED;
+		}
+	}
+
+	return ret;
+}
+
+static int _od_resume_noirq(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct omap_device *od = to_omap_device(pdev);
+
+	if (od->flags & OMAP_DEVICE_SUSPENDED) {
+		od->flags &= ~OMAP_DEVICE_SUSPENDED;
+		omap_device_enable(pdev);
+		/*
+		 * XXX: we run before core runtime pm has resumed itself. At
+		 * this point in time, we just restore the runtime pm state and
+		 * considering symmetric operations in resume, we donot expect
+		 * to fail. If we failed, something changed in core runtime_pm
+		 * framework OR some device driver messed things up, hence, WARN
+		 */
+		WARN(pm_runtime_set_active(dev),
+		     "Could not set %s runtime state active\n", dev_name(dev));
+		pm_generic_runtime_resume(dev);
+	}
+
+	return pm_generic_resume_noirq(dev);
+}
+#else
+#define _od_suspend_noirq NULL
+#define _od_resume_noirq NULL
+#endif
+
+struct dev_pm_domain omap_device_fail_pm_domain = {
+	.ops = {
+		SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
+				   _od_fail_runtime_resume, NULL)
+	}
+};
+
+struct dev_pm_domain omap_device_pm_domain = {
+	.ops = {
+		SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
+				   NULL)
+		USE_PLATFORM_PM_SLEEP_OPS
+		.suspend_noirq = _od_suspend_noirq,
+		.resume_noirq = _od_resume_noirq,
+		.freeze_noirq = _od_suspend_noirq,
+		.thaw_noirq = _od_resume_noirq,
+		.restore_noirq = _od_resume_noirq,
+	}
+};
+
+/**
+ * omap_device_register - register an omap_device with one omap_hwmod
+ * @od: struct omap_device * to register
+ *
+ * Register the omap_device structure.  This currently just calls
+ * platform_device_register() on the underlying platform_device.
+ * Returns the return value of platform_device_register().
+ */
+int omap_device_register(struct platform_device *pdev)
+{
+	pr_debug("omap_device: %s: registering\n", pdev->name);
+
+	pdev->dev.pm_domain = &omap_device_pm_domain;
+	return platform_device_add(pdev);
+}
+
+
+/* Public functions for use by device drivers through struct platform_data */
+
+/**
+ * omap_device_enable - fully activate an omap_device
+ * @od: struct omap_device * to activate
+ *
+ * Do whatever is necessary for the hwmods underlying omap_device @od
+ * to be accessible and ready to operate.  This generally involves
+ * enabling clocks, setting SYSCONFIG registers; and in the future may
+ * involve remuxing pins.  Device drivers should call this function
+ * indirectly via pm_runtime_get*().  Returns -EINVAL if called when
+ * the omap_device is already enabled, or passes along the return
+ * value of _omap_device_enable_hwmods().
+ */
+int omap_device_enable(struct platform_device *pdev)
+{
+	int ret;
+	struct omap_device *od;
+
+	od = to_omap_device(pdev);
+
+	if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
+		dev_warn(&pdev->dev,
+			 "omap_device: %s() called from invalid state %d\n",
+			 __func__, od->_state);
+		return -EINVAL;
+	}
+
+	ret = _omap_device_enable_hwmods(od);
+
+	od->_state = OMAP_DEVICE_STATE_ENABLED;
+
+	return ret;
+}
+
+/**
+ * omap_device_idle - idle an omap_device
+ * @od: struct omap_device * to idle
+ *
+ * Idle omap_device @od.  Device drivers call this function indirectly
+ * via pm_runtime_put*().  Returns -EINVAL if the omap_device is not
+ * currently enabled, or passes along the return value of
+ * _omap_device_idle_hwmods().
+ */
+int omap_device_idle(struct platform_device *pdev)
+{
+	int ret;
+	struct omap_device *od;
+
+	od = to_omap_device(pdev);
+
+	if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
+		dev_warn(&pdev->dev,
+			 "omap_device: %s() called from invalid state %d\n",
+			 __func__, od->_state);
+		return -EINVAL;
+	}
+
+	ret = _omap_device_idle_hwmods(od);
+
+	od->_state = OMAP_DEVICE_STATE_IDLE;
+
+	return ret;
+}
+
+/**
+ * omap_device_assert_hardreset - set a device's hardreset line
+ * @pdev: struct platform_device * to reset
+ * @name: const char * name of the reset line
+ *
+ * Set the hardreset line identified by @name on the IP blocks
+ * associated with the hwmods backing the platform_device @pdev.  All
+ * of the hwmods associated with @pdev must have the same hardreset
+ * line linked to them for this to work.  Passes along the return value
+ * of omap_hwmod_assert_hardreset() in the event of any failure, or
+ * returns 0 upon success.
+ */
+int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
+{
+	struct omap_device *od = to_omap_device(pdev);
+	int ret = 0;
+	int i;
+
+	for (i = 0; i < od->hwmods_cnt; i++) {
+		ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+/**
+ * omap_device_deassert_hardreset - release a device's hardreset line
+ * @pdev: struct platform_device * to reset
+ * @name: const char * name of the reset line
+ *
+ * Release the hardreset line identified by @name on the IP blocks
+ * associated with the hwmods backing the platform_device @pdev.  All
+ * of the hwmods associated with @pdev must have the same hardreset
+ * line linked to them for this to work.  Passes along the return
+ * value of omap_hwmod_deassert_hardreset() in the event of any
+ * failure, or returns 0 upon success.
+ */
+int omap_device_deassert_hardreset(struct platform_device *pdev,
+				   const char *name)
+{
+	struct omap_device *od = to_omap_device(pdev);
+	int ret = 0;
+	int i;
+
+	for (i = 0; i < od->hwmods_cnt; i++) {
+		ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+/**
+ * omap_device_get_by_hwmod_name() - convert a hwmod name to
+ * device pointer.
+ * @oh_name: name of the hwmod device
+ *
+ * Returns back a struct device * pointer associated with a hwmod
+ * device represented by a hwmod_name
+ */
+struct device *omap_device_get_by_hwmod_name(const char *oh_name)
+{
+	struct omap_hwmod *oh;
+
+	if (!oh_name) {
+		WARN(1, "%s: no hwmod name!\n", __func__);
+		return ERR_PTR(-EINVAL);
+	}
+
+	oh = omap_hwmod_lookup(oh_name);
+	if (!oh) {
+		WARN(1, "%s: no hwmod for %s\n", __func__,
+			oh_name);
+		return ERR_PTR(-ENODEV);
+	}
+	if (!oh->od) {
+		WARN(1, "%s: no omap_device for %s\n", __func__,
+			oh_name);
+		return ERR_PTR(-ENODEV);
+	}
+
+	return &oh->od->pdev->dev;
+}
+
+static struct notifier_block platform_nb = {
+	.notifier_call = _omap_device_notifier_call,
+};
+
+static int __init omap_device_init(void)
+{
+	bus_register_notifier(&platform_bus_type, &platform_nb);
+	return 0;
+}
+omap_core_initcall(omap_device_init);
+
+/**
+ * omap_device_late_idle - idle devices without drivers
+ * @dev: struct device * associated with omap_device
+ * @data: unused
+ *
+ * Check the driver bound status of this device, and idle it
+ * if there is no driver attached.
+ */
+static int __init omap_device_late_idle(struct device *dev, void *data)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct omap_device *od = to_omap_device(pdev);
+	int i;
+
+	if (!od)
+		return 0;
+
+	/*
+	 * If omap_device state is enabled, but has no driver bound,
+	 * idle it.
+	 */
+
+	/*
+	 * Some devices (like memory controllers) are always kept
+	 * enabled, and should not be idled even with no drivers.
+	 */
+	for (i = 0; i < od->hwmods_cnt; i++)
+		if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
+			return 0;
+
+	if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
+		if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
+			dev_warn(dev, "%s: enabled but no driver.  Idling\n",
+				 __func__);
+			omap_device_idle(pdev);
+		}
+	}
+
+	return 0;
+}
+
+static int __init omap_device_late_init(void)
+{
+	bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
+
+	WARN(!of_have_populated_dt(),
+		"legacy booting deprecated, please update to boot with .dts\n");
+
+	return 0;
+}
+omap_late_initcall_sync(omap_device_late_init);