[PATCH V5 06/10] PM / OPP: Add infrastructure to manage multiple regulators

This patch adds infrastructure to manage multiple regulators and updates the only user (cpufreq-dt) of dev_pm_opp_set{put}_regulator().

This is preparatory work for adding full support for devices with multiple regulators.

Signed-off-by: Viresh Kumar viresh.kumar@linaro.org Tested-by: Dave Gerlach d-gerlach@ti.com

--- V4->V5: - Don't allocate from within rcu locked section. - s/+// --- drivers/base/power/opp/core.c | 246 +++++++++++++++++++++++++++------------ drivers/base/power/opp/debugfs.c | 52 +++++++-- drivers/base/power/opp/of.c | 103 +++++++++++----- drivers/base/power/opp/opp.h | 10 +- drivers/cpufreq/cpufreq-dt.c | 9 +- include/linux/pm_opp.h | 8 +- 6 files changed, 301 insertions(+), 127 deletions(-)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 37fad2eb0f47..89a3fd720724 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -93,6 +93,8 @@ struct opp_table *_find_opp_table(struct device *dev) * Return: voltage in micro volt corresponding to the opp, else * return 0 * + * This is useful only for devices with single power supply. + * * Locking: This function must be called under rcu_read_lock(). opp is a rcu * protected pointer. This means that opp which could have been fetched by * opp_find_freq_{exact,ceil,floor} functions is valid as long as we are @@ -112,7 +114,7 @@ unsigned long dev_pm_opp_get_voltage(struct dev_pm_opp *opp) if (IS_ERR_OR_NULL(tmp_opp)) pr_err("%s: Invalid parameters\n", __func__); else - v = tmp_opp->supply.u_volt; + v = tmp_opp->supplies[0].u_volt;

return v; } @@ -210,6 +212,24 @@ unsigned long dev_pm_opp_get_max_clock_latency(struct device *dev) } EXPORT_SYMBOL_GPL(dev_pm_opp_get_max_clock_latency);

+static int _get_regulator_count(struct device *dev) +{ + struct opp_table *opp_table; + int count; + + rcu_read_lock(); + + opp_table = _find_opp_table(dev); + if (!IS_ERR(opp_table)) + count = opp_table->regulator_count; + else + count = 0; + + rcu_read_unlock(); + + return count; +} + /** * dev_pm_opp_get_max_volt_latency() - Get max voltage latency in nanoseconds * @dev: device for which we do this operation @@ -222,34 +242,51 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) { struct opp_table *opp_table; struct dev_pm_opp *opp; - struct regulator *reg; + struct regulator *reg, **regulators; unsigned long latency_ns = 0; - unsigned long min_uV = ~0, max_uV = 0; - int ret; + int ret, i, count; + struct { + unsigned long min; + unsigned long max; + } *uV; + + count = _get_regulator_count(dev); + + /* Regulator may not be required for the device */ + if (!count) + return 0; + + regulators = kmalloc_array(count, sizeof(*regulators), GFP_KERNEL); + if (!regulators) + return 0; + + uV = kmalloc_array(count, sizeof(*uV), GFP_KERNEL); + if (!uV) + goto free_regulators;

rcu_read_lock();

opp_table = _find_opp_table(dev); if (IS_ERR(opp_table)) { rcu_read_unlock(); - return 0; + goto free_uV; }

- reg = opp_table->regulator; - if (IS_ERR(reg)) { - /* Regulator may not be required for device */ - rcu_read_unlock(); - return 0; - } + memcpy(regulators, opp_table->regulators, count * sizeof(*regulators));

- list_for_each_entry_rcu(opp, &opp_table->opp_list, node) { - if (!opp->available) - continue; + for (i = 0; i < count; i++) { + uV[i].min = ~0; + uV[i].max = 0;

- if (opp->supply.u_volt_min < min_uV) - min_uV = opp->supply.u_volt_min; - if (opp->supply.u_volt_max > max_uV) - max_uV = opp->supply.u_volt_max; + list_for_each_entry_rcu(opp, &opp_table->opp_list, node) { + if (!opp->available) + continue; + + if (opp->supplies[i].u_volt_min < uV[i].min) + uV[i].min = opp->supplies[i].u_volt_min; + if (opp->supplies[i].u_volt_max > uV[i].max) + uV[i].max = opp->supplies[i].u_volt_max; + } }

rcu_read_unlock(); @@ -258,9 +295,16 @@ unsigned long dev_pm_opp_get_max_volt_latency(struct device *dev) * The caller needs to ensure that opp_table (and hence the regulator) * isn't freed, while we are executing this routine. */ - ret = regulator_set_voltage_time(reg, min_uV, max_uV); - if (ret > 0) - latency_ns = ret * 1000; + for (i = 0; reg = regulators[i], i < count; i++) { + ret = regulator_set_voltage_time(reg, uV[i].min, uV[i].max); + if (ret > 0) + latency_ns += ret * 1000; + } + +free_uV: + kfree(uV); +free_regulators: + kfree(regulators);

return latency_ns; } @@ -580,7 +624,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) { struct opp_table *opp_table; struct dev_pm_opp *old_opp, *opp; - struct regulator *reg; + struct regulator *reg = ERR_PTR(-ENXIO); struct clk *clk; unsigned long freq, old_freq; struct dev_pm_opp_supply old_supply, new_supply; @@ -633,14 +677,23 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) return ret; }

+ if (opp_table->regulators) { + /* This function only supports single regulator per device */ + if (WARN_ON(opp_table->regulator_count > 1)) { + dev_err(dev, "multiple regulators not supported\n"); + rcu_read_unlock(); + return -EINVAL; + } + + reg = opp_table->regulators[0]; + } + if (IS_ERR(old_opp)) old_supply.u_volt = 0; else - memcpy(&old_supply, &old_opp->supply, sizeof(old_supply)); - - memcpy(&new_supply, &opp->supply, sizeof(new_supply)); + memcpy(&old_supply, old_opp->supplies, sizeof(old_supply));

- reg = opp_table->regulator; + memcpy(&new_supply, opp->supplies, sizeof(new_supply));

rcu_read_unlock();

@@ -764,9 +817,6 @@ static struct opp_table *_add_opp_table(struct device *dev)

_of_init_opp_table(opp_table, dev);

- /* Set regulator to a non-NULL error value */ - opp_table->regulator = ERR_PTR(-ENXIO); - /* Find clk for the device */ opp_table->clk = clk_get(dev, NULL); if (IS_ERR(opp_table->clk)) { @@ -815,7 +865,7 @@ static void _remove_opp_table(struct opp_table *opp_table) if (opp_table->prop_name) return;

- if (!IS_ERR(opp_table->regulator)) + if (opp_table->regulators) return;

/* Release clk */ @@ -924,35 +974,50 @@ struct dev_pm_opp *_allocate_opp(struct device *dev, struct opp_table **opp_table) { struct dev_pm_opp *opp; + int count, supply_size; + struct opp_table *table;

- /* allocate new OPP node */ - opp = kzalloc(sizeof(*opp), GFP_KERNEL); - if (!opp) + table = _add_opp_table(dev); + if (!table) return NULL;

- INIT_LIST_HEAD(&opp->node); + /* Allocate space for at least one supply */ + count = table->regulator_count ? table->regulator_count : 1; + supply_size = sizeof(*opp->supplies) * count;

- *opp_table = _add_opp_table(dev); - if (!*opp_table) { - kfree(opp); + /* allocate new OPP node and supplies structures */ + opp = kzalloc(sizeof(*opp) + supply_size, GFP_KERNEL); + if (!opp) { + kfree(table); return NULL; }

+ /* Put the supplies at the end of the OPP structure as an empty array */ + opp->supplies = (struct dev_pm_opp_supply *)(opp + 1); + INIT_LIST_HEAD(&opp->node); + + *opp_table = table; + return opp; }

static bool _opp_supported_by_regulators(struct dev_pm_opp *opp, struct opp_table *opp_table) { - struct regulator *reg = opp_table->regulator; - - if (!IS_ERR(reg) && - !regulator_is_supported_voltage(reg, opp->supply.u_volt_min, - opp->supply.u_volt_max)) { - pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", - __func__, opp->supply.u_volt_min, - opp->supply.u_volt_max); - return false; + struct regulator *reg; + int i; + + for (i = 0; i < opp_table->regulator_count; i++) { + reg = opp_table->regulators[i]; + + if (!regulator_is_supported_voltage(reg, + opp->supplies[i].u_volt_min, + opp->supplies[i].u_volt_max)) { + pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n", + __func__, opp->supplies[i].u_volt_min, + opp->supplies[i].u_volt_max); + return false; + } }

return true; @@ -984,12 +1049,13 @@ int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,

/* Duplicate OPPs */ dev_warn(dev, "%s: duplicate OPPs detected. Existing: freq: %lu, volt: %lu, enabled: %d. New: freq: %lu, volt: %lu, enabled: %d\n", - __func__, opp->rate, opp->supply.u_volt, - opp->available, new_opp->rate, new_opp->supply.u_volt, - new_opp->available); + __func__, opp->rate, opp->supplies[0].u_volt, + opp->available, new_opp->rate, + new_opp->supplies[0].u_volt, new_opp->available);

+ /* Should we compare voltages for all regulators here ? */ return opp->available && - new_opp->supply.u_volt == opp->supply.u_volt ? 0 : -EEXIST; + new_opp->supplies[0].u_volt == opp->supplies[0].u_volt ? 0 : -EEXIST; }

new_opp->opp_table = opp_table; @@ -1056,9 +1122,9 @@ int _opp_add_v1(struct device *dev, unsigned long freq, long u_volt, /* populate the opp table */ new_opp->rate = freq; tol = u_volt * opp_table->voltage_tolerance_v1 / 100; - new_opp->supply.u_volt = u_volt; - new_opp->supply.u_volt_min = u_volt - tol; - new_opp->supply.u_volt_max = u_volt + tol; + new_opp->supplies[0].u_volt = u_volt; + new_opp->supplies[0].u_volt_min = u_volt - tol; + new_opp->supplies[0].u_volt_max = u_volt + tol; new_opp->available = true; new_opp->dynamic = dynamic;

@@ -1303,12 +1369,14 @@ void dev_pm_opp_put_prop_name(struct device *dev) EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name);

/** - * dev_pm_opp_set_regulator() - Set regulator name for the device + * dev_pm_opp_set_regulators() - Set regulator names for the device * @dev: Device for which regulator name is being set. - * @name: Name of the regulator. + * @names: Array of pointers to the names of the regulator. + * @count: Number of regulators. * * In order to support OPP switching, OPP layer needs to know the name of the - * device's regulator, as the core would be required to switch voltages as well. + * device's regulators, as the core would be required to switch voltages as + * well. * * This must be called before any OPPs are initialized for the device. * @@ -1318,11 +1386,12 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_put_prop_name); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -int dev_pm_opp_set_regulator(struct device *dev, const char *name) +int dev_pm_opp_set_regulators(struct device *dev, const char * const names[], + unsigned int count) { struct opp_table *opp_table; struct regulator *reg; - int ret; + int ret, i;

mutex_lock(&opp_table_lock);

@@ -1338,26 +1407,44 @@ int dev_pm_opp_set_regulator(struct device *dev, const char *name) goto err; }

- /* Already have a regulator set */ - if (WARN_ON(!IS_ERR(opp_table->regulator))) { + /* Already have regulators set */ + if (WARN_ON(opp_table->regulators)) { ret = -EBUSY; goto err; } - /* Allocate the regulator */ - reg = regulator_get_optional(dev, name); - if (IS_ERR(reg)) { - ret = PTR_ERR(reg); - if (ret != -EPROBE_DEFER) - dev_err(dev, "%s: no regulator (%s) found: %d\n", - __func__, name, ret); + + opp_table->regulators = kmalloc_array(count, + sizeof(*opp_table->regulators), + GFP_KERNEL); + if (!opp_table->regulators) { + ret = -ENOMEM; goto err; }

- opp_table->regulator = reg; + for (i = 0; i < count; i++) { + reg = regulator_get_optional(dev, names[i]); + if (IS_ERR(reg)) { + ret = PTR_ERR(reg); + if (ret != -EPROBE_DEFER) + dev_err(dev, "%s: regulator (%s) not found: %d\n", + __func__, names[i], ret); + goto free_regulators; + } + + opp_table->regulators[i] = reg; + } + + opp_table->regulator_count = count;

mutex_unlock(&opp_table_lock); return 0;

+free_regulators: + while (i != 0) + regulator_put(opp_table->regulators[--i]); + + kfree(opp_table->regulators); + opp_table->regulators = NULL; err: _remove_opp_table(opp_table); unlock: @@ -1365,11 +1452,11 @@ int dev_pm_opp_set_regulator(struct device *dev, const char *name)

return ret; } -EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulator); +EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulators);

/** - * dev_pm_opp_put_regulator() - Releases resources blocked for regulator - * @dev: Device for which regulator was set. + * dev_pm_opp_put_regulators() - Releases resources blocked for regulators + * @dev: Device for which regulators were set. * * Locking: The internal opp_table and opp structures are RCU protected. * Hence this function internally uses RCU updater strategy with mutex locks @@ -1377,9 +1464,10 @@ EXPORT_SYMBOL_GPL(dev_pm_opp_set_regulator); * that this function is *NOT* called under RCU protection or in contexts where * mutex cannot be locked. */ -void dev_pm_opp_put_regulator(struct device *dev) +void dev_pm_opp_put_regulators(struct device *dev) { struct opp_table *opp_table; + int i;

mutex_lock(&opp_table_lock);

@@ -1391,16 +1479,20 @@ void dev_pm_opp_put_regulator(struct device *dev) goto unlock; }

- if (IS_ERR(opp_table->regulator)) { - dev_err(dev, "%s: Doesn't have regulator set\n", __func__); + if (!opp_table->regulators) { + dev_err(dev, "%s: Doesn't have regulators set\n", __func__); goto unlock; }

/* Make sure there are no concurrent readers while updating opp_table */ WARN_ON(!list_empty(&opp_table->opp_list));

- regulator_put(opp_table->regulator); - opp_table->regulator = ERR_PTR(-ENXIO); + for (i = opp_table->regulator_count - 1; i >= 0; i--) + regulator_put(opp_table->regulators[i]); + + kfree(opp_table->regulators); + opp_table->regulators = NULL; + opp_table->regulator_count = 0;

/* Try freeing opp_table if this was the last blocking resource */ _remove_opp_table(opp_table); @@ -1408,7 +1500,7 @@ void dev_pm_opp_put_regulator(struct device *dev) unlock: mutex_unlock(&opp_table_lock); } -EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulator); +EXPORT_SYMBOL_GPL(dev_pm_opp_put_regulators);

/** * dev_pm_opp_add() - Add an OPP table from a table definitions diff --git a/drivers/base/power/opp/debugfs.c b/drivers/base/power/opp/debugfs.c index c897676ca35f..95f433db4ac7 100644 --- a/drivers/base/power/opp/debugfs.c +++ b/drivers/base/power/opp/debugfs.c @@ -15,6 +15,7 @@ #include <linux/err.h> #include <linux/init.h> #include <linux/limits.h> +#include <linux/slab.h>

#include "opp.h"

@@ -34,6 +35,46 @@ void opp_debug_remove_one(struct dev_pm_opp *opp) debugfs_remove_recursive(opp->dentry); }

+static bool opp_debug_create_supplies(struct dev_pm_opp *opp, + struct opp_table *opp_table, + struct dentry *pdentry) +{ + struct dentry *d; + int i = 0; + char *name; + + /* Always create at least supply-0 directory */ + do { + name = kasprintf(GFP_KERNEL, "supply-%d", i); + + /* Create per-opp directory */ + d = debugfs_create_dir(name, pdentry); + + kfree(name); + + if (!d) + return false; + + if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d, + &opp->supplies[i].u_volt)) + return false; + + if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d, + &opp->supplies[i].u_volt_min)) + return false; + + if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d, + &opp->supplies[i].u_volt_max)) + return false; + + if (!debugfs_create_ulong("u_amp", S_IRUGO, d, + &opp->supplies[i].u_amp)) + return false; + } while (++i < opp_table->regulator_count); + + return true; +} + int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) { struct dentry *pdentry = opp_table->dentry; @@ -63,16 +104,7 @@ int opp_debug_create_one(struct dev_pm_opp *opp, struct opp_table *opp_table) if (!debugfs_create_ulong("rate_hz", S_IRUGO, d, &opp->rate)) return -ENOMEM;

- if (!debugfs_create_ulong("u_volt_target", S_IRUGO, d, &opp->supply.u_volt)) - return -ENOMEM; - - if (!debugfs_create_ulong("u_volt_min", S_IRUGO, d, &opp->supply.u_volt_min)) - return -ENOMEM; - - if (!debugfs_create_ulong("u_volt_max", S_IRUGO, d, &opp->supply.u_volt_max)) - return -ENOMEM; - - if (!debugfs_create_ulong("u_amp", S_IRUGO, d, &opp->supply.u_amp)) + if (!opp_debug_create_supplies(opp, opp_table, d)) return -ENOMEM;

if (!debugfs_create_ulong("clock_latency_ns", S_IRUGO, d, diff --git a/drivers/base/power/opp/of.c b/drivers/base/power/opp/of.c index bdf409d42126..3f7d2591b173 100644 --- a/drivers/base/power/opp/of.c +++ b/drivers/base/power/opp/of.c @@ -17,6 +17,7 @@ #include <linux/errno.h> #include <linux/device.h> #include <linux/of.h> +#include <linux/slab.h> #include <linux/export.h>

#include "opp.h" @@ -101,16 +102,16 @@ static bool _opp_is_supported(struct device *dev, struct opp_table *opp_table, return true; }

-/* TODO: Support multiple regulators */ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, struct opp_table *opp_table) { - u32 microvolt[3] = {0}; - u32 val; - int count, ret; + u32 *microvolt, *microamp = NULL; + int supplies, vcount, icount, ret, i, j; struct property *prop = NULL; char name[NAME_MAX];

+ supplies = opp_table->regulator_count ? opp_table->regulator_count : 1; + /* Search for "opp-microvolt-<name>" */ if (opp_table->prop_name) { snprintf(name, sizeof(name), "opp-microvolt-%s", @@ -128,34 +129,29 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, return 0; }

- count = of_property_count_u32_elems(opp->np, name); - if (count < 0) { + vcount = of_property_count_u32_elems(opp->np, name); + if (vcount < 0) { dev_err(dev, "%s: Invalid %s property (%d)\n", - __func__, name, count); - return count; + __func__, name, vcount); + return vcount; }

- /* There can be one or three elements here */ - if (count != 1 && count != 3) { - dev_err(dev, "%s: Invalid number of elements in %s property (%d)\n", - __func__, name, count); + /* There can be one or three elements per supply */ + if (vcount != supplies && vcount != supplies * 3) { + dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", + __func__, name, vcount, supplies); return -EINVAL; }

- ret = of_property_read_u32_array(opp->np, name, microvolt, count); + microvolt = kmalloc_array(vcount, sizeof(*microvolt), GFP_KERNEL); + if (!microvolt) + return -ENOMEM; + + ret = of_property_read_u32_array(opp->np, name, microvolt, vcount); if (ret) { dev_err(dev, "%s: error parsing %s: %d\n", __func__, name, ret); - return -EINVAL; - } - - opp->supply.u_volt = microvolt[0]; - - if (count == 1) { - opp->supply.u_volt_min = opp->supply.u_volt; - opp->supply.u_volt_max = opp->supply.u_volt; - } else { - opp->supply.u_volt_min = microvolt[1]; - opp->supply.u_volt_max = microvolt[2]; + ret = -EINVAL; + goto free_microvolt; }

/* Search for "opp-microamp-<name>" */ @@ -172,10 +168,59 @@ static int opp_parse_supplies(struct dev_pm_opp *opp, struct device *dev, prop = of_find_property(opp->np, name, NULL); }

- if (prop && !of_property_read_u32(opp->np, name, &val)) - opp->supply.u_amp = val; + if (prop) { + icount = of_property_count_u32_elems(opp->np, name); + if (icount < 0) { + dev_err(dev, "%s: Invalid %s property (%d)\n", __func__, + name, icount); + ret = icount; + goto free_microvolt; + }

- return 0; + if (icount != supplies) { + dev_err(dev, "%s: Invalid number of elements in %s property (%d) with supplies (%d)\n", + __func__, name, icount, supplies); + ret = -EINVAL; + goto free_microvolt; + } + + microamp = kmalloc_array(icount, sizeof(*microamp), GFP_KERNEL); + if (!microamp) { + ret = -EINVAL; + goto free_microvolt; + } + + ret = of_property_read_u32_array(opp->np, name, microamp, + icount); + if (ret) { + dev_err(dev, "%s: error parsing %s: %d\n", __func__, + name, ret); + ret = -EINVAL; + goto free_microamp; + } + } + + for (i = 0, j = 0; i < supplies; i++) { + opp->supplies[i].u_volt = microvolt[j++]; + + if (vcount == supplies) { + opp->supplies[i].u_volt_min = opp->supplies[i].u_volt; + opp->supplies[i].u_volt_max = opp->supplies[i].u_volt; + } else { + opp->supplies[i].u_volt_min = microvolt[j++]; + opp->supplies[i].u_volt_max = microvolt[j++]; + } + + if (microamp) + opp->supplies[i].u_amp = microamp[i]; + } + +free_microamp: + kfree(microamp); +free_microvolt: + kfree(microvolt); + + return ret; }

/** @@ -304,8 +349,8 @@ static int _opp_add_static_v2(struct device *dev, struct device_node *np)

pr_debug("%s: turbo:%d rate:%lu uv:%lu uvmin:%lu uvmax:%lu latency:%lu\n", __func__, new_opp->turbo, new_opp->rate, - new_opp->supply.u_volt, new_opp->supply.u_volt_min, - new_opp->supply.u_volt_max, new_opp->clock_latency_ns); + new_opp->supplies[0].u_volt, new_opp->supplies[0].u_volt_min, + new_opp->supplies[0].u_volt_max, new_opp->clock_latency_ns);

/* * Notify the changes in the availability of the operable diff --git a/drivers/base/power/opp/opp.h b/drivers/base/power/opp/opp.h index 8a02516542c2..5b0f7e53bede 100644 --- a/drivers/base/power/opp/opp.h +++ b/drivers/base/power/opp/opp.h @@ -61,7 +61,7 @@ extern struct list_head opp_tables; * @turbo: true if turbo (boost) OPP * @suspend: true if suspend OPP * @rate: Frequency in hertz - * @supply: Power supply voltage/current values + * @supplies: Power supplies voltage/current values * @clock_latency_ns: Latency (in nanoseconds) of switching to this OPP's * frequency from any other OPP's frequency. * @opp_table: points back to the opp_table struct this opp belongs to @@ -80,7 +80,7 @@ struct dev_pm_opp { bool suspend; unsigned long rate;

- struct dev_pm_opp_supply supply; + struct dev_pm_opp_supply *supplies;

unsigned long clock_latency_ns;

@@ -139,7 +139,8 @@ enum opp_table_access { * @supported_hw_count: Number of elements in supported_hw array. * @prop_name: A name to postfix to many DT properties, while parsing them. * @clk: Device's clock handle - * @regulator: Supply regulator + * @regulators: Supply regulators + * @regulator_count: Number of power supply regulators * @dentry: debugfs dentry pointer of the real device directory (not links). * @dentry_name: Name of the real dentry. * @@ -174,7 +175,8 @@ struct opp_table { unsigned int supported_hw_count; const char *prop_name; struct clk *clk; - struct regulator *regulator; + struct regulator **regulators; + unsigned int regulator_count;

#ifdef CONFIG_DEBUG_FS struct dentry *dentry; diff --git a/drivers/cpufreq/cpufreq-dt.c b/drivers/cpufreq/cpufreq-dt.c index 5c07ae05d69a..15cb26118dc7 100644 --- a/drivers/cpufreq/cpufreq-dt.c +++ b/drivers/cpufreq/cpufreq-dt.c @@ -186,7 +186,10 @@ static int cpufreq_init(struct cpufreq_policy *policy) */ name = find_supply_name(cpu_dev); if (name) { - ret = dev_pm_opp_set_regulator(cpu_dev, name); + const char *names[] = {name}; + + ret = dev_pm_opp_set_regulators(cpu_dev, names, + ARRAY_SIZE(names)); if (ret) { dev_err(cpu_dev, "Failed to set regulator for cpu%d: %d\n", policy->cpu, ret); @@ -285,7 +288,7 @@ static int cpufreq_init(struct cpufreq_policy *policy) out_free_opp: dev_pm_opp_of_cpumask_remove_table(policy->cpus); if (name) - dev_pm_opp_put_regulator(cpu_dev); + dev_pm_opp_put_regulators(cpu_dev); out_put_clk: clk_put(cpu_clk);

@@ -300,7 +303,7 @@ static int cpufreq_exit(struct cpufreq_policy *policy) dev_pm_opp_free_cpufreq_table(priv->cpu_dev, &policy->freq_table); dev_pm_opp_of_cpumask_remove_table(policy->related_cpus); if (priv->reg_name) - dev_pm_opp_put_regulator(priv->cpu_dev); + dev_pm_opp_put_regulators(priv->cpu_dev);

clk_put(policy->clk); kfree(priv); diff --git a/include/linux/pm_opp.h b/include/linux/pm_opp.h index f69126e2bb59..27eea9bfc5ed 100644 --- a/include/linux/pm_opp.h +++ b/include/linux/pm_opp.h @@ -78,8 +78,8 @@ int dev_pm_opp_set_supported_hw(struct device *dev, const u32 *versions, void dev_pm_opp_put_supported_hw(struct device *dev); int dev_pm_opp_set_prop_name(struct device *dev, const char *name); void dev_pm_opp_put_prop_name(struct device *dev); -int dev_pm_opp_set_regulator(struct device *dev, const char *name); -void dev_pm_opp_put_regulator(struct device *dev); +int dev_pm_opp_set_regulators(struct device *dev, const char * const names[], unsigned int count); +void dev_pm_opp_put_regulators(struct device *dev); int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq); int dev_pm_opp_set_sharing_cpus(struct device *cpu_dev, const struct cpumask *cpumask); int dev_pm_opp_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask); @@ -186,12 +186,12 @@ static inline int dev_pm_opp_set_prop_name(struct device *dev, const char *name)

static inline void dev_pm_opp_put_prop_name(struct device *dev) {}

-static inline int dev_pm_opp_set_regulator(struct device *dev, const char *name) +static inline int dev_pm_opp_set_regulators(struct device *dev, const char *names[], unsigned int count) { return -ENOTSUPP; }

-static inline void dev_pm_opp_put_regulator(struct device *dev) {} +static inline void dev_pm_opp_put_regulators(struct device *dev) {}

static inline int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) {