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-----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQQUwxxKyE5l/npt8ARiEGxRG/Sl2wUCXYAIeQAKCRBiEGxRG/Sl 2/SzAQDEnoNxzV/R5kWFd+2kmFeY3cll0d99KMrWJ8om+kje6QD/cXxZHzFm+T1L UPF66k76oOODV7cyndjXnTnRXbeCRAM= =Szby -----END PGP SIGNATURE----- Merge tag 'leds-for-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds Pull LED updates from Jacek Anaszewski: "In this cycle we've finally managed to contribute the patch set sorting out LED naming issues. Besides that there are many changes scattered among various LED class drivers and triggers. LED naming related improvements: - add new 'function' and 'color' fwnode properties and deprecate 'label' property which has been frequently abused for conveying vendor specific names that have been available in sysfs anyway - introduce a set of standard LED_FUNCTION* definitions - introduce a set of standard LED_COLOR_ID* definitions - add a new {devm_}led_classdev_register_ext() API with the capability of automatic LED name composition basing on the properties available in the passed fwnode; the function is backwards compatible in a sense that it uses 'label' data, if present in the fwnode, for creating LED name - add tools/leds/get_led_device_info.sh script for retrieving LED vendor, product and bus names, if applicable; it also performs basic validation of an LED name - update following drivers and their DT bindings to use the new LED registration API: - leds-an30259a, leds-gpio, leds-as3645a, leds-aat1290, leds-cr0014114, leds-lm3601x, leds-lm3692x, leds-lp8860, leds-lt3593, leds-sc27xx-blt Other LED class improvements: - replace {devm_}led_classdev_register() macros with inlines - allow to call led_classdev_unregister() unconditionally - switch to use fwnode instead of be stuck with OF one LED triggers improvements: - led-triggers: - fix dereferencing of null pointer - fix a memory leak bug - ledtrig-gpio: - GPIO 0 is valid Drop superseeded apu2/3 support from leds-apu since for apu2+ a newer, more complete driver exists, based on a generic driver for the AMD SOCs gpio-controller, supporting LEDs as well other devices: - drop profile field from priv data - drop iosize field from priv data - drop enum_apu_led_platform_types - drop superseeded apu2/3 led support - add pr_fmt prefix for better log output - fix error message on probing failure Other misc fixes and improvements to existing LED class drivers: - leds-ns2, leds-max77650: - add of_node_put() before return - leds-pwm, leds-is31fl32xx: - use struct_size() helper - leds-lm3697, leds-lm36274, leds-lm3532: - switch to use fwnode_property_count_uXX() - leds-lm3532: - fix brightness control for i2c mode - change the define for the fs current register - fixes for the driver for stability - add full scale current configuration - dt: Add property for full scale current. - avoid potentially unpaired regulator calls - move static keyword to the front of declarations - fix optional led-max-microamp prop error handling - leds-max77650: - add of_node_put() before return - add MODULE_ALIAS() - Switch to fwnode property API - leds-as3645a: - fix misuse of strlcpy - leds-netxbig: - add of_node_put() in netxbig_leds_get_of_pdata() - remove legacy board-file support - leds-is31fl319x: - simplify getting the adapter of a client - leds-ti-lmu-common: - fix coccinelle issue - move static keyword to the front of declaration - leds-syscon: - use resource managed variant of device register - leds-ktd2692: - fix a typo in the name of a constant - leds-lp5562: - allow firmware files up to the maximum length - leds-an30259a: - fix typo - leds-pca953x: - include the right header" * tag 'leds-for-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds: (72 commits) leds: lm3532: Fix optional led-max-microamp prop error handling led: triggers: Fix dereferencing of null pointer leds: ti-lmu-common: Move static keyword to the front of declaration leds: lm3532: Move static keyword to the front of declarations leds: trigger: gpio: GPIO 0 is valid leds: pwm: Use struct_size() helper leds: is31fl32xx: Use struct_size() helper leds: ti-lmu-common: Fix coccinelle issue in TI LMU leds: lm3532: Avoid potentially unpaired regulator calls leds: syscon: Use resource managed variant of device register leds: Replace {devm_}led_classdev_register() macros with inlines leds: Allow to call led_classdev_unregister() unconditionally leds: lm3532: Add full scale current configuration dt: lm3532: Add property for full scale current. leds: lm3532: Fixes for the driver for stability leds: lm3532: Change the define for the fs current register leds: lm3532: Fix brightness control for i2c mode leds: Switch to use fwnode instead of be stuck with OF one leds: max77650: Switch to fwnode property API led: triggers: Fix a memory leak bug ...
625 lines
16 KiB
C
625 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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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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#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_STANDBY] = "regulator-state-standby",
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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 int of_get_regulation_constraints(struct device *dev,
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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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int n_phandles;
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u32 pval;
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n_phandles = of_count_phandle_with_args(np, "regulator-coupled-with",
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NULL);
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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))
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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 (n_phandles) {
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constraints->max_spread = devm_kzalloc(dev,
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sizeof(*constraints->max_spread) * n_phandles,
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GFP_KERNEL);
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if (!constraints->max_spread)
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return -ENOMEM;
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of_property_read_u32_array(np, "regulator-coupled-max-spread",
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constraints->max_spread, n_phandles);
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}
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if (!of_property_read_u32(np, "regulator-max-step-microvolt",
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&pval))
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constraints->max_uV_step = 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_STANDBY:
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suspend_state = &constraints->state_standby;
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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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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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return 0;
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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 structure 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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if (of_get_regulation_constraints(dev, node, &init_data, desc))
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return NULL;
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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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static struct
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device_node *regulator_of_get_init_node(struct device *dev,
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const struct regulator_desc *desc)
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{
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struct device_node *search, *child;
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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 (!strcmp(desc->of_match, search->name))
|
|
return search;
|
|
}
|
|
|
|
if (!search) {
|
|
dev_dbg(dev, "Failed to find regulator container node '%s'\n",
|
|
desc->regulators_node);
|
|
return NULL;
|
|
}
|
|
|
|
for_each_available_child_of_node(search, child) {
|
|
name = of_get_property(child, "regulator-compatible", NULL);
|
|
if (!name)
|
|
name = child->name;
|
|
|
|
if (!strcmp(desc->of_match, name)) {
|
|
of_node_put(search);
|
|
return of_node_get(child);
|
|
}
|
|
}
|
|
|
|
of_node_put(search);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
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\n", child);
|
|
goto error;
|
|
}
|
|
|
|
if (desc->of_parse_cb && desc->of_parse_cb(child, desc, config)) {
|
|
dev_err(dev,
|
|
"driver callback failed to parse DT for regulator %pOFn\n",
|
|
child);
|
|
goto error;
|
|
}
|
|
|
|
*node = child;
|
|
|
|
return init_data;
|
|
|
|
error:
|
|
of_node_put(child);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct regulator_dev *of_find_regulator_by_node(struct device_node *np)
|
|
{
|
|
struct device *dev;
|
|
|
|
dev = class_find_device_by_of_node(®ulator_class, np);
|
|
|
|
return dev ? dev_to_rdev(dev) : NULL;
|
|
}
|
|
|
|
/*
|
|
* 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,
|
|
struct device_node *to_find,
|
|
int *index)
|
|
{
|
|
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) {
|
|
*index = i;
|
|
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)
|
|
{
|
|
struct device_node *node = rdev->dev.of_node;
|
|
int n_phandles = of_get_n_coupled(rdev);
|
|
struct device_node *c_node;
|
|
int index;
|
|
int i;
|
|
bool ret = true;
|
|
|
|
/* iterate over rdev's phandles */
|
|
for (i = 0; i < n_phandles; i++) {
|
|
int max_spread = rdev->constraints->max_spread[i];
|
|
int c_max_spread, c_n_phandles;
|
|
|
|
if (max_spread <= 0) {
|
|
dev_err(&rdev->dev, "max_spread value invalid\n");
|
|
return false;
|
|
}
|
|
|
|
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 coupled reg phandles mismatch\n");
|
|
ret = false;
|
|
goto clean;
|
|
}
|
|
|
|
if (!of_coupling_find_node(c_node, node, &index)) {
|
|
dev_err(&rdev->dev, "missing 2-way linking for coupled regulators\n");
|
|
ret = false;
|
|
goto clean;
|
|
}
|
|
|
|
if (of_property_read_u32_index(c_node, "regulator-coupled-max-spread",
|
|
index, &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;
|
|
}
|
|
|
|
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;
|
|
}
|