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![Mark Brown](/assets/img/avatar_default.png)
A collection of fairly minor bug fixes here, a couple of driver specific ones plus two core fixes. There's one fix for the new suspend state code which fixes some confusion with constant values that are supposed to indicate noop operation and another fixing a race condition with the creation of sysfs files on new regulators. -----BEGIN PGP SIGNATURE----- iQFHBAABCgAxFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAluuL04THGJyb29uaWVA a2VybmVsLm9yZwAKCRAk1otyXVSH0GdVB/9AWbmIA8iNJDo/CETEZ9UiOvEFXSO8 vRk+WcU4vtPo4qp27ylYRh9dKjWczEq8dKpe4YmaLjv4HX5MggLiwO1cLl44+q6y AKZYK1FvGR1yExP3adE4XEC03jD21909mkLCNRawCVh+Iorp4r5CA6ahNfzT0flI Eo5nKi4zN/0WSjxcoDdqUQ7oIivlmxiC8HYZyluS7f6UV0rcQXeqdXKqs6utPUxD w4MLQriPqG7R0g75XqoRB7hVcZBO4m/NRi6SMGQtF1WG1unpl+iCnxRa0WXHi1th nMg900nucgIe6gWBxMocWbyXsFj3+CrWlCB4BxVW8+pe8VyLFtYnPUA5 =yAAv -----END PGP SIGNATURE----- gpgsig -----BEGIN PGP SIGNATURE----- iQFHBAABCgAxFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAluuMasTHGJyb29uaWVA a2VybmVsLm9yZwAKCRAk1otyXVSH0NPZB/0X1e0JWK819dT5HWgNa6E2391fn1Qj eY89u0cJj+3gom3QyOKCupcjEIumPHVYjiCsIEVipH+vefcuzgyUkRHhBZsSFgyp 90sVHKywg5pcxi6em/wuStzkXA84HjCVPJ4nDd6fnE6Ew7NDpP0/FPkpt7PwqlFy b56pg/iK6YFhgXLlJMi6k7TGb/NG9M0qZzrb5UvTIbqVw9IRsqQrLN6YSaqhUFwe hwonne4bMPl4DroVBGDz15djFv0Re7DxJuhAErJ/Fafzq5SX1zAPzkJ6peJnSdyF 2fUv6596nhNKVqAvMF5514kBq+JeFB13YS4S2Xm2Dm/rQ1P9G8XSfzQG =YPYr -----END PGP SIGNATURE----- Merge tag 'regulator-v4.19-rc5' into regulator-bd718xx regulator: Fixes for 4.19 A collection of fairly minor bug fixes here, a couple of driver specific ones plus two core fixes. There's one fix for the new suspend state code which fixes some confusion with constant values that are supposed to indicate noop operation and another fixing a race condition with the creation of sysfs files on new regulators.
586 lines
16 KiB
C
586 lines
16 KiB
C
/*
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* OF helpers for regulator framework
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*
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* Copyright (C) 2011 Texas Instruments, Inc.
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* Rajendra Nayak <rnayak@ti.com>
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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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#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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#include "internal.h"
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static const char *const regulator_states[PM_SUSPEND_MAX + 1] = {
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[PM_SUSPEND_MEM] = "regulator-state-mem",
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[PM_SUSPEND_MAX] = "regulator-state-disk",
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};
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static void of_get_regulation_constraints(struct device_node *np,
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struct regulator_init_data **init_data,
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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;
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struct device_node *suspend_np;
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unsigned int mode;
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int ret, i, len;
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u32 pval;
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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))
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constraints->min_uV = pval;
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if (!of_property_read_u32(np, "regulator-max-microvolt", &pval))
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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? */
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if (constraints->min_uV && constraints->max_uV)
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constraints->apply_uV = true;
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if (!of_property_read_u32(np, "regulator-microvolt-offset", &pval))
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constraints->uV_offset = pval;
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if (!of_property_read_u32(np, "regulator-min-microamp", &pval))
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constraints->min_uA = pval;
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if (!of_property_read_u32(np, "regulator-max-microamp", &pval))
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constraints->max_uA = pval;
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if (!of_property_read_u32(np, "regulator-input-current-limit-microamp",
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&pval))
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constraints->ilim_uA = pval;
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/* Current change possible? */
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if (constraints->min_uA != constraints->max_uA)
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constraints->valid_ops_mask |= REGULATOR_CHANGE_CURRENT;
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constraints->boot_on = of_property_read_bool(np, "regulator-boot-on");
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constraints->always_on = of_property_read_bool(np, "regulator-always-on");
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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"))
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constraints->valid_ops_mask |= REGULATOR_CHANGE_BYPASS;
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if (of_property_read_bool(np, "regulator-allow-set-load"))
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constraints->valid_ops_mask |= REGULATOR_CHANGE_DRMS;
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ret = of_property_read_u32(np, "regulator-ramp-delay", &pval);
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if (!ret) {
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if (pval)
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constraints->ramp_delay = pval;
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else
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constraints->ramp_disable = true;
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}
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ret = of_property_read_u32(np, "regulator-settling-time-us", &pval);
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if (!ret)
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constraints->settling_time = pval;
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ret = of_property_read_u32(np, "regulator-settling-time-up-us", &pval);
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if (!ret)
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constraints->settling_time_up = pval;
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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'\n",
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np);
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constraints->settling_time_up = 0;
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}
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ret = of_property_read_u32(np, "regulator-settling-time-down-us",
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&pval);
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if (!ret)
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constraints->settling_time_down = pval;
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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'\n",
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np);
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constraints->settling_time_down = 0;
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}
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ret = of_property_read_u32(np, "regulator-enable-ramp-delay", &pval);
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if (!ret)
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constraints->enable_time = pval;
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constraints->soft_start = of_property_read_bool(np,
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"regulator-soft-start");
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ret = of_property_read_u32(np, "regulator-active-discharge", &pval);
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if (!ret) {
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constraints->active_discharge =
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(pval) ? REGULATOR_ACTIVE_DISCHARGE_ENABLE :
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REGULATOR_ACTIVE_DISCHARGE_DISABLE;
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}
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if (!of_property_read_u32(np, "regulator-initial-mode", &pval)) {
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if (desc && desc->of_map_mode) {
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mode = desc->of_map_mode(pval);
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if (mode == REGULATOR_MODE_INVALID)
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pr_err("%pOFn: invalid mode %u\n", 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\n",
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np, pval);
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}
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}
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len = of_property_count_elems_of_size(np, "regulator-allowed-modes",
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sizeof(u32));
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if (len > 0) {
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if (desc && desc->of_map_mode) {
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for (i = 0; i < len; i++) {
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ret = of_property_read_u32_index(np,
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"regulator-allowed-modes", i, &pval);
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if (ret) {
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pr_err("%pOFn: couldn't read allowed modes index %d, ret=%d\n",
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np, i, ret);
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break;
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}
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mode = desc->of_map_mode(pval);
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if (mode == REGULATOR_MODE_INVALID)
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pr_err("%pOFn: invalid regulator-allowed-modes element %u\n",
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np, pval);
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else
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constraints->valid_modes_mask |= mode;
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}
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if (constraints->valid_modes_mask)
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constraints->valid_ops_mask
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|= REGULATOR_CHANGE_MODE;
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} else {
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pr_warn("%pOFn: mode mapping not defined\n", np);
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}
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}
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if (!of_property_read_u32(np, "regulator-system-load", &pval))
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constraints->system_load = pval;
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if (!of_property_read_u32(np, "regulator-coupled-max-spread",
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&pval))
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constraints->max_spread = pval;
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constraints->over_current_protection = of_property_read_bool(np,
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"regulator-over-current-protection");
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for (i = 0; i < ARRAY_SIZE(regulator_states); i++) {
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switch (i) {
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case PM_SUSPEND_MEM:
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suspend_state = &constraints->state_mem;
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break;
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case PM_SUSPEND_MAX:
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suspend_state = &constraints->state_disk;
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break;
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case PM_SUSPEND_ON:
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case PM_SUSPEND_TO_IDLE:
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case PM_SUSPEND_STANDBY:
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default:
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continue;
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}
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suspend_np = of_get_child_by_name(np, regulator_states[i]);
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if (!suspend_np || !suspend_state)
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continue;
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if (!of_property_read_u32(suspend_np, "regulator-mode",
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&pval)) {
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if (desc && desc->of_map_mode) {
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mode = desc->of_map_mode(pval);
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if (mode == REGULATOR_MODE_INVALID)
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pr_err("%pOFn: invalid mode %u\n",
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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\n",
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np, pval);
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}
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}
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if (of_property_read_bool(suspend_np,
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"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,
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"regulator-off-in-suspend"))
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suspend_state->enabled = DISABLE_IN_SUSPEND;
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if (!of_property_read_u32(np, "regulator-suspend-min-microvolt",
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&pval))
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suspend_state->min_uV = pval;
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if (!of_property_read_u32(np, "regulator-suspend-max-microvolt",
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&pval))
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suspend_state->max_uV = pval;
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if (!of_property_read_u32(suspend_np,
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"regulator-suspend-microvolt", &pval))
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suspend_state->uV = pval;
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else /* otherwise use min_uV as default suspend voltage */
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suspend_state->uV = suspend_state->min_uV;
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if (of_property_read_bool(suspend_np,
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"regulator-changeable-in-suspend"))
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suspend_state->changeable = true;
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if (i == PM_SUSPEND_MEM)
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constraints->initial_state = PM_SUSPEND_MEM;
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of_node_put(suspend_np);
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suspend_state = NULL;
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suspend_np = NULL;
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}
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}
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/**
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* of_get_regulator_init_data - extract regulator_init_data structure info
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* @dev: device requesting for regulator_init_data
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* @node: regulator device node
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* @desc: regulator description
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*
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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 struture or NULL if memory
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* alloc fails.
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*/
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struct regulator_init_data *of_get_regulator_init_data(struct device *dev,
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struct device_node *node,
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const struct regulator_desc *desc)
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{
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struct regulator_init_data *init_data;
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if (!node)
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return NULL;
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init_data = devm_kzalloc(dev, sizeof(*init_data), GFP_KERNEL);
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if (!init_data)
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return NULL; /* Out of memory? */
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of_get_regulation_constraints(node, &init_data, desc);
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return init_data;
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}
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EXPORT_SYMBOL_GPL(of_get_regulator_init_data);
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struct devm_of_regulator_matches {
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struct of_regulator_match *matches;
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unsigned int num_matches;
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};
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static void devm_of_regulator_put_matches(struct device *dev, void *res)
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{
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struct devm_of_regulator_matches *devm_matches = res;
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int i;
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for (i = 0; i < devm_matches->num_matches; i++)
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of_node_put(devm_matches->matches[i].of_node);
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}
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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
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* @node: parent device node of the regulators
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* @matches: match table for the regulators
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* @num_matches: number of entries in match table
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*
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* This function uses a match table specified by the regulator driver to
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* parse regulator init data from the device tree. @node is expected to
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* contain a set of child nodes, each providing the init data for one
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* regulator. The data parsed from a child node will be matched to a regulator
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* based on either the deprecated property regulator-compatible if present,
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* 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
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* regulator.
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*
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* Returns the number of matches found or a negative error code on failure.
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*/
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int of_regulator_match(struct device *dev, struct device_node *node,
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struct of_regulator_match *matches,
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unsigned int num_matches)
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{
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unsigned int count = 0;
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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)
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return -EINVAL;
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devm_matches = devres_alloc(devm_of_regulator_put_matches,
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sizeof(struct devm_of_regulator_matches),
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GFP_KERNEL);
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if (!devm_matches)
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return -ENOMEM;
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devm_matches->matches = matches;
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devm_matches->num_matches = num_matches;
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devres_add(dev, devm_matches);
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for (i = 0; i < num_matches; i++) {
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struct of_regulator_match *match = &matches[i];
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match->init_data = NULL;
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match->of_node = NULL;
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}
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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)
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name = child->name;
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for (i = 0; i < num_matches; i++) {
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struct of_regulator_match *match = &matches[i];
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if (match->of_node)
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continue;
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if (strcmp(match->name, name))
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continue;
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match->init_data =
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of_get_regulator_init_data(dev, child,
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match->desc);
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if (!match->init_data) {
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dev_err(dev,
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"failed to parse DT for regulator %pOFn\n",
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child);
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of_node_put(child);
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return -EINVAL;
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}
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match->of_node = of_node_get(child);
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count++;
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break;
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}
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}
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return count;
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}
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EXPORT_SYMBOL_GPL(of_regulator_match);
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struct regulator_init_data *regulator_of_get_init_data(struct device *dev,
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const struct regulator_desc *desc,
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struct regulator_config *config,
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struct device_node **node)
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{
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struct device_node *search, *child;
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struct regulator_init_data *init_data = NULL;
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const char *name;
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if (!dev->of_node || !desc->of_match)
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return NULL;
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if (desc->regulators_node)
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search = of_get_child_by_name(dev->of_node,
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desc->regulators_node);
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else
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search = of_node_get(dev->of_node);
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if (!search) {
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dev_dbg(dev, "Failed to find regulator container node '%s'\n",
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desc->regulators_node);
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return NULL;
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}
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for_each_available_child_of_node(search, child) {
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name = of_get_property(child, "regulator-compatible", NULL);
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if (!name)
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name = child->name;
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if (strcmp(desc->of_match, name))
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continue;
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init_data = of_get_regulator_init_data(dev, child, desc);
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if (!init_data) {
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dev_err(dev,
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"failed to parse DT for regulator %pOFn\n",
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child);
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break;
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}
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if (desc->of_parse_cb) {
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if (desc->of_parse_cb(child, desc, config)) {
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dev_err(dev,
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"driver callback failed to parse DT for regulator %pOFn\n",
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child);
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init_data = NULL;
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break;
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}
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}
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of_node_get(child);
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*node = child;
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break;
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}
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of_node_put(search);
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return init_data;
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}
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static int of_node_match(struct device *dev, const void *data)
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{
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return dev->of_node == data;
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}
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struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
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{
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struct device *dev;
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dev = class_find_device(®ulator_class, NULL, np, of_node_match);
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return dev ? dev_to_rdev(dev) : NULL;
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}
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/*
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* Returns number of regulators coupled with rdev.
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*/
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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,
|
|
struct device_node *to_find)
|
|
{
|
|
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);
|
|
|
|
if (found)
|
|
break;
|
|
}
|
|
|
|
return found;
|
|
}
|
|
|
|
/**
|
|
* of_check_coupling_data - Parse rdev's coupling properties and check data
|
|
* consistency
|
|
* @rdev - pointer to regulator_dev whose data is checked
|
|
*
|
|
* 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)
|
|
{
|
|
int max_spread = rdev->constraints->max_spread;
|
|
struct device_node *node = rdev->dev.of_node;
|
|
int n_phandles = of_get_n_coupled(rdev);
|
|
struct device_node *c_node;
|
|
int i;
|
|
bool ret = true;
|
|
|
|
if (max_spread <= 0) {
|
|
dev_err(&rdev->dev, "max_spread value invalid\n");
|
|
return false;
|
|
}
|
|
|
|
/* iterate over rdev's phandles */
|
|
for (i = 0; i < n_phandles; i++) {
|
|
int c_max_spread, c_n_phandles;
|
|
|
|
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) {
|
|
dev_err(&rdev->dev, "number of couped reg phandles mismatch\n");
|
|
ret = false;
|
|
goto clean;
|
|
}
|
|
|
|
if (of_property_read_u32(c_node, "regulator-coupled-max-spread",
|
|
&c_max_spread)) {
|
|
ret = false;
|
|
goto clean;
|
|
}
|
|
|
|
if (c_max_spread != max_spread) {
|
|
dev_err(&rdev->dev,
|
|
"coupled regulators max_spread mismatch\n");
|
|
ret = false;
|
|
goto clean;
|
|
}
|
|
|
|
if (!of_coupling_find_node(c_node, node)) {
|
|
dev_err(&rdev->dev, "missing 2-way linking for coupled regulators\n");
|
|
ret = false;
|
|
}
|
|
|
|
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;
|
|
}
|