![Viresh Kumar](/assets/img/avatar_default.png)
The OPP binding says: Property: operating-points-v2 ... This can contain more than one phandle for power domain providers that provide multiple power domains. That is, one phandle for each power domain. If only one phandle is available, then the same OPP table will be used for all power domains provided by the power domain provider. But the OPP core isn't allowing the same OPP table to be used for multiple domains. Update dev_pm_opp_of_add_table_indexed() to allow that. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Tested-by: Rajendra Nayak <rnayak@codeaurora.org>
780 lines
20 KiB
C
780 lines
20 KiB
C
/*
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* Generic OPP OF helpers
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*
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* Copyright (C) 2009-2010 Texas Instruments Incorporated.
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* Nishanth Menon
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* Romit Dasgupta
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* Kevin Hilman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/cpu.h>
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#include <linux/errno.h>
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#include <linux/device.h>
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#include <linux/of_device.h>
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#include <linux/pm_domain.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include "opp.h"
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static struct opp_table *_managed_opp(const struct device_node *np)
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{
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struct opp_table *opp_table, *managed_table = NULL;
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mutex_lock(&opp_table_lock);
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list_for_each_entry(opp_table, &opp_tables, node) {
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if (opp_table->np == np) {
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/*
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* Multiple devices can point to the same OPP table and
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* so will have same node-pointer, np.
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*
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* But the OPPs will be considered as shared only if the
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* OPP table contains a "opp-shared" property.
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*/
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if (opp_table->shared_opp == OPP_TABLE_ACCESS_SHARED) {
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_get_opp_table_kref(opp_table);
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managed_table = opp_table;
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}
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break;
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}
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}
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mutex_unlock(&opp_table_lock);
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return managed_table;
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}
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void _of_init_opp_table(struct opp_table *opp_table, struct device *dev)
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{
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struct device_node *np;
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/*
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* Only required for backward compatibility with v1 bindings, but isn't
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* harmful for other cases. And so we do it unconditionally.
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*/
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np = of_node_get(dev->of_node);
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if (np) {
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u32 val;
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if (!of_property_read_u32(np, "clock-latency", &val))
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opp_table->clock_latency_ns_max = val;
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of_property_read_u32(np, "voltage-tolerance",
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&opp_table->voltage_tolerance_v1);
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of_node_put(np);
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}
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}
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static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table,
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struct device_node *np)
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{
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unsigned int count = opp_table->supported_hw_count;
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u32 version;
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int ret;
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if (!opp_table->supported_hw) {
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/*
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* In the case that no supported_hw has been set by the
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* platform but there is an opp-supported-hw value set for
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* an OPP then the OPP should not be enabled as there is
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* no way to see if the hardware supports it.
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*/
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if (of_find_property(np, "opp-supported-hw", NULL))
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return false;
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else
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return true;
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}
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while (count--) {
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ret = of_property_read_u32_index(np, "opp-supported-hw", count,
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&version);
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if (ret) {
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dev_warn(dev, "%s: failed to read opp-supported-hw property at index %d: %d\n",
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__func__, count, ret);
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return false;
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}
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/* Both of these are bitwise masks of the versions */
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if (!(version & opp_table->supported_hw[count]))
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return false;
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}
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return true;
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}
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static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev,
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struct opp_table *opp_table)
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{
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u32 *microvolt, *microamp = NULL;
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int supplies, vcount, icount, ret, i, j;
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struct property *prop = NULL;
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char name[NAME_MAX];
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supplies = opp_table->regulator_count ? opp_table->regulator_count : 1;
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/* Search for "opp-microvolt-<name>" */
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if (opp_table->prop_name) {
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snprintf(name, sizeof(name), "opp-microvolt-%s",
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opp_table->prop_name);
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prop = of_find_property(opp->np, name, NULL);
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}
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if (!prop) {
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/* Search for "opp-microvolt" */
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sprintf(name, "opp-microvolt");
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prop = of_find_property(opp->np, name, NULL);
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/* Missing property isn't a problem, but an invalid entry is */
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if (!prop) {
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if (!opp_table->regulator_count)
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return 0;
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dev_err(dev, "%s: opp-microvolt missing although OPP managing regulators\n",
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__func__);
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return -EINVAL;
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}
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}
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vcount = of_property_count_u32_elems(opp->np, name);
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if (vcount < 0) {
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dev_err(dev, "%s: Invalid %s property (%d)\n",
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__func__, name, vcount);
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return vcount;
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}
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/* There can be one or three elements per supply */
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if (vcount != supplies && vcount != supplies * 3) {
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dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
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__func__, name, vcount, supplies);
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return -EINVAL;
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}
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microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL);
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if (!microvolt)
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return -ENOMEM;
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ret = of_property_read_u32_array(opp->np, name, microvolt, vcount);
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if (ret) {
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dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret);
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ret = -EINVAL;
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goto free_microvolt;
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}
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/* Search for "opp-microamp-<name>" */
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prop = NULL;
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if (opp_table->prop_name) {
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snprintf(name, sizeof(name), "opp-microamp-%s",
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opp_table->prop_name);
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prop = of_find_property(opp->np, name, NULL);
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}
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if (!prop) {
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/* Search for "opp-microamp" */
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sprintf(name, "opp-microamp");
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prop = of_find_property(opp->np, name, NULL);
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}
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if (prop) {
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icount = of_property_count_u32_elems(opp->np, name);
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if (icount < 0) {
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dev_err(dev, "%s: Invalid %s property (%d)\n", __func__,
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name, icount);
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ret = icount;
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goto free_microvolt;
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}
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if (icount != supplies) {
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dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n",
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__func__, name, icount, supplies);
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ret = -EINVAL;
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goto free_microvolt;
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}
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microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL);
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if (!microamp) {
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ret = -EINVAL;
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goto free_microvolt;
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}
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ret = of_property_read_u32_array(opp->np, name, microamp,
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icount);
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if (ret) {
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dev_err(dev, "%s: error parsing %s: %d\n", __func__,
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name, ret);
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ret = -EINVAL;
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goto free_microamp;
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}
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}
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for (i = 0, j = 0; i < supplies; i++) {
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opp->supplies[i].u_volt = microvolt[j++];
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if (vcount == supplies) {
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opp->supplies[i].u_volt_min = opp->supplies[i].u_volt;
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opp->supplies[i].u_volt_max = opp->supplies[i].u_volt;
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} else {
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opp->supplies[i].u_volt_min = microvolt[j++];
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opp->supplies[i].u_volt_max = microvolt[j++];
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}
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if (microamp)
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opp->supplies[i].u_amp = microamp[i];
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}
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free_microamp:
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kfree(microamp);
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free_microvolt:
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kfree(microvolt);
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return ret;
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}
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/**
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* dev_pm_opp_of_remove_table() - Free OPP table entries created from static DT
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* entries
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* @dev: device pointer used to lookup OPP table.
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*
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* Free OPPs created using static entries present in DT.
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*/
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void dev_pm_opp_of_remove_table(struct device *dev)
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{
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_dev_pm_opp_find_and_remove_table(dev, false);
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_remove_table);
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/* Returns opp descriptor node for a device node, caller must
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* do of_node_put() */
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static struct device_node *_opp_of_get_opp_desc_node(struct device_node *np,
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int index)
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{
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/* "operating-points-v2" can be an array for power domain providers */
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return of_parse_phandle(np, "operating-points-v2", index);
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}
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/* Returns opp descriptor node for a device, caller must do of_node_put() */
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struct device_node *dev_pm_opp_of_get_opp_desc_node(struct device *dev)
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{
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return _opp_of_get_opp_desc_node(dev->of_node, 0);
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}
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EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_opp_desc_node);
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/**
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* _opp_add_static_v2() - Allocate static OPPs (As per 'v2' DT bindings)
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* @opp_table: OPP table
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* @dev: device for which we do this operation
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* @np: device node
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*
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* This function adds an opp definition to the opp table and returns status. The
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* opp can be controlled using dev_pm_opp_enable/disable functions and may be
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* removed by dev_pm_opp_remove.
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*
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* Return:
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* 0 On success OR
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* Duplicate OPPs (both freq and volt are same) and opp->available
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* -EEXIST Freq are same and volt are different OR
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* Duplicate OPPs (both freq and volt are same) and !opp->available
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* -ENOMEM Memory allocation failure
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* -EINVAL Failed parsing the OPP node
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*/
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static int _opp_add_static_v2(struct opp_table *opp_table, struct device *dev,
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struct device_node *np)
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{
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struct dev_pm_opp *new_opp;
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u64 rate = 0;
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u32 val;
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int ret;
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bool rate_not_available = false;
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new_opp = _opp_allocate(opp_table);
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if (!new_opp)
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return -ENOMEM;
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ret = of_property_read_u64(np, "opp-hz", &rate);
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if (ret < 0) {
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/* "opp-hz" is optional for devices like power domains. */
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if (!of_find_property(dev->of_node, "#power-domain-cells",
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NULL)) {
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dev_err(dev, "%s: opp-hz not found\n", __func__);
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goto free_opp;
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}
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rate_not_available = true;
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} else {
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/*
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* Rate is defined as an unsigned long in clk API, and so
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* casting explicitly to its type. Must be fixed once rate is 64
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* bit guaranteed in clk API.
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*/
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new_opp->rate = (unsigned long)rate;
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}
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/* Check if the OPP supports hardware's hierarchy of versions or not */
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if (!_opp_is_supported(dev, opp_table, np)) {
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dev_dbg(dev, "OPP not supported by hardware: %llu\n", rate);
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goto free_opp;
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}
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new_opp->turbo = of_property_read_bool(np, "turbo-mode");
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new_opp->np = np;
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new_opp->dynamic = false;
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new_opp->available = true;
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if (!of_property_read_u32(np, "clock-latency-ns", &val))
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new_opp->clock_latency_ns = val;
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new_opp->pstate = of_genpd_opp_to_performance_state(dev, np);
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ret = opp_parse_supplies(new_opp, dev, opp_table);
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if (ret)
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goto free_opp;
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ret = _opp_add(dev, new_opp, opp_table, rate_not_available);
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if (ret) {
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/* Don't return error for duplicate OPPs */
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if (ret == -EBUSY)
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ret = 0;
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goto free_opp;
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}
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/* OPP to select on device suspend */
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if (of_property_read_bool(np, "opp-suspend")) {
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if (opp_table->suspend_opp) {
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dev_warn(dev, "%s: Multiple suspend OPPs found (%lu %lu)\n",
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__func__, opp_table->suspend_opp->rate,
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new_opp->rate);
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} else {
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new_opp->suspend = true;
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opp_table->suspend_opp = new_opp;
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}
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}
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if (new_opp->clock_latency_ns > opp_table->clock_latency_ns_max)
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opp_table->clock_latency_ns_max = new_opp->clock_latency_ns;
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pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n",
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__func__, new_opp->turbo, new_opp->rate,
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new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min,
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new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns);
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/*
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* Notify the changes in the availability of the operable
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* frequency/voltage list.
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*/
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blocking_notifier_call_chain(&opp_table->head, OPP_EVENT_ADD, new_opp);
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return 0;
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free_opp:
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_opp_free(new_opp);
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return ret;
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}
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/* Initializes OPP tables based on new bindings */
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static int _of_add_opp_table_v2(struct device *dev, struct device_node *opp_np)
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{
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struct device_node *np;
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struct opp_table *opp_table;
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int ret = 0, count = 0, pstate_count = 0;
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struct dev_pm_opp *opp;
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opp_table = _managed_opp(opp_np);
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if (opp_table) {
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/* OPPs are already managed */
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if (!_add_opp_dev(dev, opp_table))
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ret = -ENOMEM;
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goto put_opp_table;
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}
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opp_table = dev_pm_opp_get_opp_table(dev);
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if (!opp_table)
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return -ENOMEM;
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/* We have opp-table node now, iterate over it and add OPPs */
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for_each_available_child_of_node(opp_np, np) {
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count++;
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ret = _opp_add_static_v2(opp_table, dev, np);
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if (ret) {
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dev_err(dev, "%s: Failed to add OPP, %d\n", __func__,
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ret);
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_dev_pm_opp_remove_table(opp_table, dev, false);
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of_node_put(np);
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goto put_opp_table;
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}
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}
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/* There should be one of more OPP defined */
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if (WARN_ON(!count)) {
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ret = -ENOENT;
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goto put_opp_table;
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}
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list_for_each_entry(opp, &opp_table->opp_list, node)
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pstate_count += !!opp->pstate;
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/* Either all or none of the nodes shall have performance state set */
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if (pstate_count && pstate_count != count) {
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dev_err(dev, "Not all nodes have performance state set (%d: %d)\n",
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count, pstate_count);
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ret = -ENOENT;
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goto put_opp_table;
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}
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if (pstate_count)
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opp_table->genpd_performance_state = true;
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opp_table->np = opp_np;
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if (of_property_read_bool(opp_np, "opp-shared"))
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opp_table->shared_opp = OPP_TABLE_ACCESS_SHARED;
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else
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opp_table->shared_opp = OPP_TABLE_ACCESS_EXCLUSIVE;
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put_opp_table:
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dev_pm_opp_put_opp_table(opp_table);
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return ret;
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}
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/* Initializes OPP tables based on old-deprecated bindings */
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static int _of_add_opp_table_v1(struct device *dev)
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{
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struct opp_table *opp_table;
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const struct property *prop;
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const __be32 *val;
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int nr, ret = 0;
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prop = of_find_property(dev->of_node, "operating-points", NULL);
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if (!prop)
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return -ENODEV;
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if (!prop->value)
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return -ENODATA;
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/*
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* Each OPP is a set of tuples consisting of frequency and
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* voltage like <freq-kHz vol-uV>.
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*/
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nr = prop->length / sizeof(u32);
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if (nr % 2) {
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dev_err(dev, "%s: Invalid OPP table\n", __func__);
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return -EINVAL;
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}
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opp_table = dev_pm_opp_get_opp_table(dev);
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if (!opp_table)
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return -ENOMEM;
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val = prop->value;
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while (nr) {
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unsigned long freq = be32_to_cpup(val++) * 1000;
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unsigned long volt = be32_to_cpup(val++);
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ret = _opp_add_v1(opp_table, dev, freq, volt, false);
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if (ret) {
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dev_err(dev, "%s: Failed to add OPP %ld (%d)\n",
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__func__, freq, ret);
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_dev_pm_opp_remove_table(opp_table, dev, false);
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break;
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}
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nr -= 2;
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}
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dev_pm_opp_put_opp_table(opp_table);
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return ret;
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}
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/**
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* dev_pm_opp_of_add_table() - Initialize opp table from device tree
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* @dev: device pointer used to lookup OPP table.
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*
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* Register the initial OPP table with the OPP library for given device.
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*
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* Return:
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* 0 On success OR
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* Duplicate OPPs (both freq and volt are same) and opp->available
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* -EEXIST Freq are same and volt are different OR
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* Duplicate OPPs (both freq and volt are same) and !opp->available
|
|
* -ENOMEM Memory allocation failure
|
|
* -ENODEV when 'operating-points' property is not found or is invalid data
|
|
* in device node.
|
|
* -ENODATA when empty 'operating-points' property is found
|
|
* -EINVAL when invalid entries are found in opp-v2 table
|
|
*/
|
|
int dev_pm_opp_of_add_table(struct device *dev)
|
|
{
|
|
struct device_node *opp_np;
|
|
int ret;
|
|
|
|
/*
|
|
* OPPs have two version of bindings now. The older one is deprecated,
|
|
* try for the new binding first.
|
|
*/
|
|
opp_np = dev_pm_opp_of_get_opp_desc_node(dev);
|
|
if (!opp_np) {
|
|
/*
|
|
* Try old-deprecated bindings for backward compatibility with
|
|
* older dtbs.
|
|
*/
|
|
return _of_add_opp_table_v1(dev);
|
|
}
|
|
|
|
ret = _of_add_opp_table_v2(dev, opp_np);
|
|
of_node_put(opp_np);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table);
|
|
|
|
/**
|
|
* dev_pm_opp_of_add_table_indexed() - Initialize indexed opp table from device tree
|
|
* @dev: device pointer used to lookup OPP table.
|
|
* @index: Index number.
|
|
*
|
|
* Register the initial OPP table with the OPP library for given device only
|
|
* using the "operating-points-v2" property.
|
|
*
|
|
* Return:
|
|
* 0 On success OR
|
|
* Duplicate OPPs (both freq and volt are same) and opp->available
|
|
* -EEXIST Freq are same and volt are different OR
|
|
* Duplicate OPPs (both freq and volt are same) and !opp->available
|
|
* -ENOMEM Memory allocation failure
|
|
* -ENODEV when 'operating-points' property is not found or is invalid data
|
|
* in device node.
|
|
* -ENODATA when empty 'operating-points' property is found
|
|
* -EINVAL when invalid entries are found in opp-v2 table
|
|
*/
|
|
int dev_pm_opp_of_add_table_indexed(struct device *dev, int index)
|
|
{
|
|
struct device_node *opp_np;
|
|
int ret, count;
|
|
|
|
again:
|
|
opp_np = _opp_of_get_opp_desc_node(dev->of_node, index);
|
|
if (!opp_np) {
|
|
/*
|
|
* If only one phandle is present, then the same OPP table
|
|
* applies for all index requests.
|
|
*/
|
|
count = of_count_phandle_with_args(dev->of_node,
|
|
"operating-points-v2", NULL);
|
|
if (count == 1 && index) {
|
|
index = 0;
|
|
goto again;
|
|
}
|
|
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = _of_add_opp_table_v2(dev, opp_np);
|
|
of_node_put(opp_np);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_of_add_table_indexed);
|
|
|
|
/* CPU device specific helpers */
|
|
|
|
/**
|
|
* dev_pm_opp_of_cpumask_remove_table() - Removes OPP table for @cpumask
|
|
* @cpumask: cpumask for which OPP table needs to be removed
|
|
*
|
|
* This removes the OPP tables for CPUs present in the @cpumask.
|
|
* This should be used only to remove static entries created from DT.
|
|
*/
|
|
void dev_pm_opp_of_cpumask_remove_table(const struct cpumask *cpumask)
|
|
{
|
|
_dev_pm_opp_cpumask_remove_table(cpumask, true);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_remove_table);
|
|
|
|
/**
|
|
* dev_pm_opp_of_cpumask_add_table() - Adds OPP table for @cpumask
|
|
* @cpumask: cpumask for which OPP table needs to be added.
|
|
*
|
|
* This adds the OPP tables for CPUs present in the @cpumask.
|
|
*/
|
|
int dev_pm_opp_of_cpumask_add_table(const struct cpumask *cpumask)
|
|
{
|
|
struct device *cpu_dev;
|
|
int cpu, ret = 0;
|
|
|
|
WARN_ON(cpumask_empty(cpumask));
|
|
|
|
for_each_cpu(cpu, cpumask) {
|
|
cpu_dev = get_cpu_device(cpu);
|
|
if (!cpu_dev) {
|
|
pr_err("%s: failed to get cpu%d device\n", __func__,
|
|
cpu);
|
|
continue;
|
|
}
|
|
|
|
ret = dev_pm_opp_of_add_table(cpu_dev);
|
|
if (ret) {
|
|
/*
|
|
* OPP may get registered dynamically, don't print error
|
|
* message here.
|
|
*/
|
|
pr_debug("%s: couldn't find opp table for cpu:%d, %d\n",
|
|
__func__, cpu, ret);
|
|
|
|
/* Free all other OPPs */
|
|
dev_pm_opp_of_cpumask_remove_table(cpumask);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_of_cpumask_add_table);
|
|
|
|
/*
|
|
* Works only for OPP v2 bindings.
|
|
*
|
|
* Returns -ENOENT if operating-points-v2 bindings aren't supported.
|
|
*/
|
|
/**
|
|
* dev_pm_opp_of_get_sharing_cpus() - Get cpumask of CPUs sharing OPPs with
|
|
* @cpu_dev using operating-points-v2
|
|
* bindings.
|
|
*
|
|
* @cpu_dev: CPU device for which we do this operation
|
|
* @cpumask: cpumask to update with information of sharing CPUs
|
|
*
|
|
* This updates the @cpumask with CPUs that are sharing OPPs with @cpu_dev.
|
|
*
|
|
* Returns -ENOENT if operating-points-v2 isn't present for @cpu_dev.
|
|
*/
|
|
int dev_pm_opp_of_get_sharing_cpus(struct device *cpu_dev,
|
|
struct cpumask *cpumask)
|
|
{
|
|
struct device_node *np, *tmp_np, *cpu_np;
|
|
int cpu, ret = 0;
|
|
|
|
/* Get OPP descriptor node */
|
|
np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
|
|
if (!np) {
|
|
dev_dbg(cpu_dev, "%s: Couldn't find opp node.\n", __func__);
|
|
return -ENOENT;
|
|
}
|
|
|
|
cpumask_set_cpu(cpu_dev->id, cpumask);
|
|
|
|
/* OPPs are shared ? */
|
|
if (!of_property_read_bool(np, "opp-shared"))
|
|
goto put_cpu_node;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
if (cpu == cpu_dev->id)
|
|
continue;
|
|
|
|
cpu_np = of_cpu_device_node_get(cpu);
|
|
if (!cpu_np) {
|
|
dev_err(cpu_dev, "%s: failed to get cpu%d node\n",
|
|
__func__, cpu);
|
|
ret = -ENOENT;
|
|
goto put_cpu_node;
|
|
}
|
|
|
|
/* Get OPP descriptor node */
|
|
tmp_np = _opp_of_get_opp_desc_node(cpu_np, 0);
|
|
of_node_put(cpu_np);
|
|
if (!tmp_np) {
|
|
pr_err("%pOF: Couldn't find opp node\n", cpu_np);
|
|
ret = -ENOENT;
|
|
goto put_cpu_node;
|
|
}
|
|
|
|
/* CPUs are sharing opp node */
|
|
if (np == tmp_np)
|
|
cpumask_set_cpu(cpu, cpumask);
|
|
|
|
of_node_put(tmp_np);
|
|
}
|
|
|
|
put_cpu_node:
|
|
of_node_put(np);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_of_get_sharing_cpus);
|
|
|
|
/**
|
|
* of_dev_pm_opp_find_required_opp() - Search for required OPP.
|
|
* @dev: The device whose OPP node is referenced by the 'np' DT node.
|
|
* @np: Node that contains the "required-opps" property.
|
|
*
|
|
* Returns the OPP of the device 'dev', whose phandle is present in the "np"
|
|
* node. Although the "required-opps" property supports having multiple
|
|
* phandles, this helper routine only parses the very first phandle in the list.
|
|
*
|
|
* Return: Matching opp, else returns ERR_PTR in case of error and should be
|
|
* handled using IS_ERR.
|
|
*
|
|
* The callers are required to call dev_pm_opp_put() for the returned OPP after
|
|
* use.
|
|
*/
|
|
struct dev_pm_opp *of_dev_pm_opp_find_required_opp(struct device *dev,
|
|
struct device_node *np)
|
|
{
|
|
struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ENODEV);
|
|
struct device_node *required_np;
|
|
struct opp_table *opp_table;
|
|
|
|
opp_table = _find_opp_table(dev);
|
|
if (IS_ERR(opp_table))
|
|
return ERR_CAST(opp_table);
|
|
|
|
required_np = of_parse_phandle(np, "required-opps", 0);
|
|
if (unlikely(!required_np)) {
|
|
dev_err(dev, "Unable to parse required-opps\n");
|
|
goto put_opp_table;
|
|
}
|
|
|
|
mutex_lock(&opp_table->lock);
|
|
|
|
list_for_each_entry(temp_opp, &opp_table->opp_list, node) {
|
|
if (temp_opp->available && temp_opp->np == required_np) {
|
|
opp = temp_opp;
|
|
|
|
/* Increment the reference count of OPP */
|
|
dev_pm_opp_get(opp);
|
|
break;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&opp_table->lock);
|
|
|
|
of_node_put(required_np);
|
|
put_opp_table:
|
|
dev_pm_opp_put_opp_table(opp_table);
|
|
|
|
return opp;
|
|
}
|
|
EXPORT_SYMBOL_GPL(of_dev_pm_opp_find_required_opp);
|
|
|
|
/**
|
|
* dev_pm_opp_get_of_node() - Gets the DT node corresponding to an opp
|
|
* @opp: opp for which DT node has to be returned for
|
|
*
|
|
* Return: DT node corresponding to the opp, else 0 on success.
|
|
*
|
|
* The caller needs to put the node with of_node_put() after using it.
|
|
*/
|
|
struct device_node *dev_pm_opp_get_of_node(struct dev_pm_opp *opp)
|
|
{
|
|
if (IS_ERR_OR_NULL(opp)) {
|
|
pr_err("%s: Invalid parameters\n", __func__);
|
|
return NULL;
|
|
}
|
|
|
|
return of_node_get(opp->np);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dev_pm_opp_get_of_node);
|