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drivers/regulator/of_regulator.c
16.4 KB
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* * OF helpers for regulator framework * * Copyright (C) 2011 Texas Instruments, Inc. * Rajendra Nayak <rnayak@ti.com> |
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*/ |
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#include <linux/module.h> |
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#include <linux/slab.h> #include <linux/of.h> #include <linux/regulator/machine.h> |
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#include <linux/regulator/driver.h> |
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#include <linux/regulator/of_regulator.h> |
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|
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#include "internal.h" |
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static const char *const regulator_states[PM_SUSPEND_MAX + 1] = { |
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[PM_SUSPEND_STANDBY] = "regulator-state-standby", |
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[PM_SUSPEND_MEM] = "regulator-state-mem", [PM_SUSPEND_MAX] = "regulator-state-disk", }; |
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static int of_get_regulation_constraints(struct device *dev, struct device_node *np, |
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struct regulator_init_data **init_data, const struct regulator_desc *desc) |
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{ |
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struct regulation_constraints *constraints = &(*init_data)->constraints; |
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struct regulator_state *suspend_state; struct device_node *suspend_np; |
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unsigned int mode; |
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int ret, i, len; |
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int n_phandles; |
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u32 pval; |
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|
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n_phandles = of_count_phandle_with_args(np, "regulator-coupled-with", NULL); n_phandles = max(n_phandles, 0); |
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constraints->name = of_get_property(np, "regulator-name", NULL); |
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if (!of_property_read_u32(np, "regulator-min-microvolt", &pval)) constraints->min_uV = pval; if (!of_property_read_u32(np, "regulator-max-microvolt", &pval)) constraints->max_uV = pval; |
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/* Voltage change possible? */ |
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if (constraints->min_uV != constraints->max_uV) |
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constraints->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE; |
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/* Do we have a voltage range, if so try to apply it? */ if (constraints->min_uV && constraints->max_uV) |
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constraints->apply_uV = true; |
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|
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if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval)) constraints->uV_offset = pval; if (!of_property_read_u32(np, "regulator-min-microamp", &pval)) constraints->min_uA = pval; if (!of_property_read_u32(np, "regulator-max-microamp", &pval)) constraints->max_uA = pval; |
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|
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if (!of_property_read_u32(np, "regulator-input-current-limit-microamp", &pval)) constraints->ilim_uA = pval; |
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/* Current change possible? */ if (constraints->min_uA != constraints->max_uA) constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT; |
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constraints->boot_on = of_property_read_bool(np, "regulator-boot-on"); constraints->always_on = of_property_read_bool(np, "regulator-always-on"); if (!constraints->always_on) /* status change should be possible. */ |
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constraints->valid_ops_mask |= REGULATOR_CHANGE_STATUS; |
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constraints->pull_down = of_property_read_bool(np, "regulator-pull-down"); |
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if (of_property_read_bool(np, "regulator-allow-bypass")) constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS; |
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if (of_property_read_bool(np, "regulator-allow-set-load")) constraints->valid_ops_mask |= REGULATOR_CHANGE_DRMS; |
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ret = of_property_read_u32(np, "regulator-ramp-delay", &pval); if (!ret) { if (pval) constraints->ramp_delay = pval; |
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else constraints->ramp_disable = true; } |
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ret = of_property_read_u32(np, "regulator-settling-time-us", &pval); if (!ret) constraints->settling_time = pval; |
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ret = of_property_read_u32(np, "regulator-settling-time-up-us", &pval); if (!ret) constraints->settling_time_up = pval; if (constraints->settling_time_up && constraints->settling_time) { |
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pr_warn("%pOFn: ambiguous configuration for settling time, ignoring 'regulator-settling-time-up-us' ", np); |
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constraints->settling_time_up = 0; } ret = of_property_read_u32(np, "regulator-settling-time-down-us", &pval); if (!ret) constraints->settling_time_down = pval; if (constraints->settling_time_down && constraints->settling_time) { |
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pr_warn("%pOFn: ambiguous configuration for settling time, ignoring 'regulator-settling-time-down-us' ", np); |
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constraints->settling_time_down = 0; } |
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ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval); if (!ret) constraints->enable_time = pval; |
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|
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constraints->soft_start = of_property_read_bool(np, "regulator-soft-start"); |
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ret = of_property_read_u32(np, "regulator-active-discharge", &pval); if (!ret) { constraints->active_discharge = (pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE : REGULATOR_ACTIVE_DISCHARGE_DISABLE; } |
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if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) { if (desc && desc->of_map_mode) { |
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mode = desc->of_map_mode(pval); if (mode == REGULATOR_MODE_INVALID) |
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pr_err("%pOFn: invalid mode %u ", np, pval); |
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else |
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constraints->initial_mode = mode; |
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} else { |
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pr_warn("%pOFn: mapping for mode %d not defined ", np, pval); |
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} } |
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len = of_property_count_elems_of_size(np, "regulator-allowed-modes", sizeof(u32)); if (len > 0) { if (desc && desc->of_map_mode) { for (i = 0; i < len; i++) { ret = of_property_read_u32_index(np, "regulator-allowed-modes", i, &pval); if (ret) { |
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pr_err("%pOFn: couldn't read allowed modes index %d, ret=%d ", np, i, ret); |
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break; } mode = desc->of_map_mode(pval); if (mode == REGULATOR_MODE_INVALID) |
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pr_err("%pOFn: invalid regulator-allowed-modes element %u ", np, pval); |
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else constraints->valid_modes_mask |= mode; } if (constraints->valid_modes_mask) constraints->valid_ops_mask |= REGULATOR_CHANGE_MODE; } else { |
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pr_warn("%pOFn: mode mapping not defined ", np); |
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} } |
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if (!of_property_read_u32(np, "regulator-system-load", &pval)) constraints->system_load = pval; |
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if (n_phandles) { constraints->max_spread = devm_kzalloc(dev, sizeof(*constraints->max_spread) * n_phandles, GFP_KERNEL); if (!constraints->max_spread) return -ENOMEM; of_property_read_u32_array(np, "regulator-coupled-max-spread", constraints->max_spread, n_phandles); } |
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if (!of_property_read_u32(np, "regulator-max-step-microvolt", &pval)) constraints->max_uV_step = pval; |
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constraints->over_current_protection = of_property_read_bool(np, "regulator-over-current-protection"); |
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for (i = 0; i < ARRAY_SIZE(regulator_states); i++) { switch (i) { case PM_SUSPEND_MEM: suspend_state = &constraints->state_mem; break; case PM_SUSPEND_MAX: suspend_state = &constraints->state_disk; break; |
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case PM_SUSPEND_STANDBY: suspend_state = &constraints->state_standby; break; |
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case PM_SUSPEND_ON: |
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case PM_SUSPEND_TO_IDLE: |
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default: continue; |
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} |
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suspend_np = of_get_child_by_name(np, regulator_states[i]); if (!suspend_np || !suspend_state) continue; |
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if (!of_property_read_u32(suspend_np, "regulator-mode", &pval)) { if (desc && desc->of_map_mode) { |
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mode = desc->of_map_mode(pval); if (mode == REGULATOR_MODE_INVALID) |
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pr_err("%pOFn: invalid mode %u ", np, pval); |
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else |
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suspend_state->mode = mode; |
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} else { |
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pr_warn("%pOFn: mapping for mode %d not defined ", np, pval); |
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} } |
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if (of_property_read_bool(suspend_np, "regulator-on-in-suspend")) |
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suspend_state->enabled = ENABLE_IN_SUSPEND; |
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else if (of_property_read_bool(suspend_np, "regulator-off-in-suspend")) |
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suspend_state->enabled = DISABLE_IN_SUSPEND; |
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|
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if (!of_property_read_u32(suspend_np, "regulator-suspend-min-microvolt", &pval)) |
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suspend_state->min_uV = pval; |
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if (!of_property_read_u32(suspend_np, "regulator-suspend-max-microvolt", &pval)) |
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suspend_state->max_uV = pval; |
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|
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if (!of_property_read_u32(suspend_np, "regulator-suspend-microvolt", &pval)) suspend_state->uV = pval; |
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else /* otherwise use min_uV as default suspend voltage */ suspend_state->uV = suspend_state->min_uV; if (of_property_read_bool(suspend_np, "regulator-changeable-in-suspend")) suspend_state->changeable = true; |
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|
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if (i == PM_SUSPEND_MEM) constraints->initial_state = PM_SUSPEND_MEM; |
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of_node_put(suspend_np); |
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suspend_state = NULL; suspend_np = NULL; } |
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return 0; |
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} /** * of_get_regulator_init_data - extract regulator_init_data structure info * @dev: device requesting for regulator_init_data |
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* @node: regulator device node * @desc: regulator description |
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* * Populates regulator_init_data structure by extracting data from device |
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* tree node, returns a pointer to the populated structure or NULL if memory |
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* alloc fails. */ |
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struct regulator_init_data *of_get_regulator_init_data(struct device *dev, |
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struct device_node *node, const struct regulator_desc *desc) |
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{ struct regulator_init_data *init_data; |
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if (!node) |
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return NULL; init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL); if (!init_data) return NULL; /* Out of memory? */ |
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if (of_get_regulation_constraints(dev, node, &init_data, desc)) return NULL; |
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return init_data; } |
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EXPORT_SYMBOL_GPL(of_get_regulator_init_data); |
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|
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struct devm_of_regulator_matches { struct of_regulator_match *matches; unsigned int num_matches; }; static void devm_of_regulator_put_matches(struct device *dev, void *res) { struct devm_of_regulator_matches *devm_matches = res; int i; for (i = 0; i < devm_matches->num_matches; i++) of_node_put(devm_matches->matches[i].of_node); } |
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/** |
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* of_regulator_match - extract multiple regulator init data from device tree. |
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* @dev: device requesting the data * @node: parent device node of the regulators * @matches: match table for the regulators * @num_matches: number of entries in match table * |
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* This function uses a match table specified by the regulator driver to * parse regulator init data from the device tree. @node is expected to * contain a set of child nodes, each providing the init data for one * regulator. The data parsed from a child node will be matched to a regulator * based on either the deprecated property regulator-compatible if present, * or otherwise the child node's name. Note that the match table is modified |
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* in place and an additional of_node reference is taken for each matched * regulator. |
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* * Returns the number of matches found or a negative error code on failure. */ int of_regulator_match(struct device *dev, struct device_node *node, struct of_regulator_match *matches, unsigned int num_matches) { unsigned int count = 0; unsigned int i; |
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const char *name; |
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struct device_node *child; |
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struct devm_of_regulator_matches *devm_matches; |
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if (!dev || !node) return -EINVAL; |
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devm_matches = devres_alloc(devm_of_regulator_put_matches, sizeof(struct devm_of_regulator_matches), GFP_KERNEL); if (!devm_matches) return -ENOMEM; devm_matches->matches = matches; devm_matches->num_matches = num_matches; devres_add(dev, devm_matches); |
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for (i = 0; i < num_matches; i++) { struct of_regulator_match *match = &matches[i]; match->init_data = NULL; match->of_node = NULL; } |
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for_each_child_of_node(node, child) { |
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name = of_get_property(child, |
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"regulator-compatible", NULL); |
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if (!name) name = child->name; |
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for (i = 0; i < num_matches; i++) { struct of_regulator_match *match = &matches[i]; if (match->of_node) continue; |
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if (strcmp(match->name, name)) |
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continue; match->init_data = |
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of_get_regulator_init_data(dev, child, match->desc); |
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if (!match->init_data) { dev_err(dev, |
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"failed to parse DT for regulator %pOFn ", child); |
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of_node_put(child); |
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return -EINVAL; } |
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match->of_node = of_node_get(child); |
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count++; break; |
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} |
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} return count; } EXPORT_SYMBOL_GPL(of_regulator_match); |
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|
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static struct device_node *regulator_of_get_init_node(struct device *dev, const struct regulator_desc *desc) |
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{ struct device_node *search, *child; |
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const char *name; if (!dev->of_node || !desc->of_match) return NULL; |
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if (desc->regulators_node) { |
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search = of_get_child_by_name(dev->of_node, desc->regulators_node); |
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} else { |
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search = of_node_get(dev->of_node); |
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|
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if (!strcmp(desc->of_match, search->name)) return search; } |
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if (!search) { |
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dev_dbg(dev, "Failed to find regulator container node '%s' ", desc->regulators_node); |
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return NULL; } |
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for_each_available_child_of_node(search, child) { |
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name = of_get_property(child, "regulator-compatible", NULL); if (!name) name = child->name; |
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if (!strcmp(desc->of_match, name)) { of_node_put(search); |
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return of_node_get(child); |
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} |
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} |
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|
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of_node_put(search); |
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|
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return NULL; } |
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|
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struct regulator_init_data *regulator_of_get_init_data(struct device *dev, const struct regulator_desc *desc, struct regulator_config *config, struct device_node **node) { struct device_node *child; struct regulator_init_data *init_data = NULL; child = regulator_of_get_init_node(dev, desc); if (!child) return NULL; init_data = of_get_regulator_init_data(dev, child, desc); if (!init_data) { dev_err(dev, "failed to parse DT for regulator %pOFn ", child); goto error; |
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} |
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if (desc->of_parse_cb) { int ret; ret = desc->of_parse_cb(child, desc, config); if (ret) { if (ret == -EPROBE_DEFER) { of_node_put(child); return ERR_PTR(-EPROBE_DEFER); } dev_err(dev, "driver callback failed to parse DT for regulator %pOFn ", child); goto error; } |
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} *node = child; |
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return init_data; |
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error: of_node_put(child); return NULL; |
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} |
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|
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struct regulator_dev *of_find_regulator_by_node(struct device_node *np) { struct device *dev; |
cfba5de9b drivers: Introduc... |
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dev = class_find_device_by_of_node(®ulator_class, np); |
148096af0 regulator: core: ... |
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return dev ? dev_to_rdev(dev) : NULL; } |
a085a31af regulator: core: ... |
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/* * Returns number of regulators coupled with rdev. */ int of_get_n_coupled(struct regulator_dev *rdev) { struct device_node *node = rdev->dev.of_node; int n_phandles; n_phandles = of_count_phandle_with_args(node, "regulator-coupled-with", NULL); return (n_phandles > 0) ? n_phandles : 0; } /* Looks for "to_find" device_node in src's "regulator-coupled-with" property */ static bool of_coupling_find_node(struct device_node *src, |
d8ca7d184 regulator: core: ... |
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struct device_node *to_find, int *index) |
a085a31af regulator: core: ... |
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{ int n_phandles, i; bool found = false; n_phandles = of_count_phandle_with_args(src, "regulator-coupled-with", NULL); for (i = 0; i < n_phandles; i++) { struct device_node *tmp = of_parse_phandle(src, "regulator-coupled-with", i); if (!tmp) break; /* found */ if (tmp == to_find) found = true; of_node_put(tmp); |
d8ca7d184 regulator: core: ... |
500 501 |
if (found) { *index = i; |
a085a31af regulator: core: ... |
502 |
break; |
d8ca7d184 regulator: core: ... |
503 |
} |
a085a31af regulator: core: ... |
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} return found; } /** * of_check_coupling_data - Parse rdev's coupling properties and check data * consistency |
45e8446e7 regulator: of_reg... |
512 |
* @rdev: pointer to regulator_dev whose data is checked |
a085a31af regulator: core: ... |
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* * Function checks if all the following conditions are met: * - rdev's max_spread is greater than 0 * - all coupled regulators have the same max_spread * - all coupled regulators have the same number of regulator_dev phandles * - all regulators are linked to each other * * Returns true if all conditions are met. */ bool of_check_coupling_data(struct regulator_dev *rdev) { |
a085a31af regulator: core: ... |
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struct device_node *node = rdev->dev.of_node; int n_phandles = of_get_n_coupled(rdev); struct device_node *c_node; |
d8ca7d184 regulator: core: ... |
527 |
int index; |
a085a31af regulator: core: ... |
528 529 |
int i; bool ret = true; |
a085a31af regulator: core: ... |
530 531 |
/* iterate over rdev's phandles */ for (i = 0; i < n_phandles; i++) { |
d8ca7d184 regulator: core: ... |
532 |
int max_spread = rdev->constraints->max_spread[i]; |
a085a31af regulator: core: ... |
533 |
int c_max_spread, c_n_phandles; |
d8ca7d184 regulator: core: ... |
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if (max_spread <= 0) { dev_err(&rdev->dev, "max_spread value invalid "); return false; } |
a085a31af regulator: core: ... |
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c_node = of_parse_phandle(node, "regulator-coupled-with", i); if (!c_node) ret = false; c_n_phandles = of_count_phandle_with_args(c_node, "regulator-coupled-with", NULL); if (c_n_phandles != n_phandles) { |
48f1b4efd regulator: Fix tr... |
550 551 |
dev_err(&rdev->dev, "number of coupled reg phandles mismatch "); |
a085a31af regulator: core: ... |
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ret = false; goto clean; } |
d8ca7d184 regulator: core: ... |
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if (!of_coupling_find_node(c_node, node, &index)) { dev_err(&rdev->dev, "missing 2-way linking for coupled regulators "); |
a085a31af regulator: core: ... |
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ret = false; goto clean; } |
d8ca7d184 regulator: core: ... |
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if (of_property_read_u32_index(c_node, "regulator-coupled-max-spread", index, &c_max_spread)) { |
a085a31af regulator: core: ... |
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ret = false; goto clean; } |
d8ca7d184 regulator: core: ... |
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if (c_max_spread != max_spread) { dev_err(&rdev->dev, "coupled regulators max_spread mismatch "); |
a085a31af regulator: core: ... |
570 |
ret = false; |
d8ca7d184 regulator: core: ... |
571 |
goto clean; |
a085a31af regulator: core: ... |
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} clean: of_node_put(c_node); if (!ret) break; } return ret; } /** * of_parse_coupled regulator - Get regulator_dev pointer from rdev's property * @rdev: Pointer to regulator_dev, whose DTS is used as a source to parse * "regulator-coupled-with" property * @index: Index in phandles array * * Returns the regulator_dev pointer parsed from DTS. If it has not been yet * registered, returns NULL */ struct regulator_dev *of_parse_coupled_regulator(struct regulator_dev *rdev, int index) { struct device_node *node = rdev->dev.of_node; struct device_node *c_node; struct regulator_dev *c_rdev; c_node = of_parse_phandle(node, "regulator-coupled-with", index); if (!c_node) return NULL; c_rdev = of_find_regulator_by_node(c_node); of_node_put(c_node); return c_rdev; } |