linux-imx

/*

 * Generic OPP OF helpers

 *

 * Copyright (C) 2009-2010 Texas Instruments Incorporated.

 *  Nishanth Menon

 *  Romit Dasgupta

 *  Kevin Hilman

 *

 * 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.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/cpu.h>

#include <linux/errno.h>

#include <linux/device.h>

#include <linux/of_device.h>

#include <linux/pm_domain.h>

#include <linux/slab.h>

#include <linux/export.h>

#include <linux/energy_model.h>

​

#include "opp.h"

​

/*

 * Returns opp descriptor node for a device node, caller must

 * do of_node_put().

 */

static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np,

                             int index)

{

    /* "operating-points-v2" can be an array for power domain providers */

    return of_parse_phandle(np, "operating-points-v2", index);

}

​

/* Returns opp descriptor node for a device, caller must do of_node_put() */

struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)

{

    return _opp_of_get_opp_desc_node(dev->of_node, 0);

}

EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);

​

struct opp_table *_managed_opp(struct device *dev, int index)

{

    struct opp_table *opp_table, *managed_table = NULL;

    struct device_node *np;

​

    np = _opp_of_get_opp_desc_node(dev->of_node, index);

    if (!np)

        return NULL;

​

    list_for_each_entry(opp_table, &opp_tables, node) {

        if (opp_table->np == np) {

            /*

             * Multiple devices can point to the same OPP table and

             * so will have same node-pointer, np.

             *

             * But the OPPs will be considered as shared only if the

             * OPP table contains a "opp-shared" property.

             */

            if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {