1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * machine.h -- SoC Regulator support, machine/board driver API.
5 * Copyright (C) 2007, 2008 Wolfson Microelectronics PLC.
7 * Author: Liam Girdwood <lrg@slimlogic.co.uk>
9 * Regulator Machine/Board Interface.
12 #ifndef __LINUX_REGULATOR_MACHINE_H_
13 #define __LINUX_REGULATOR_MACHINE_H_
15 #include <linux/regulator/consumer.h>
16 #include <linux/suspend.h>
21 * Regulator operation constraint flags. These flags are used to enable
22 * certain regulator operations and can be OR'ed together.
24 * VOLTAGE: Regulator output voltage can be changed by software on this
26 * CURRENT: Regulator output current can be changed by software on this
28 * MODE: Regulator operating mode can be changed by software on this
30 * STATUS: Regulator can be enabled and disabled.
31 * DRMS: Dynamic Regulator Mode Switching is enabled for this regulator.
32 * BYPASS: Regulator can be put into bypass mode
35 #define REGULATOR_CHANGE_VOLTAGE 0x1
36 #define REGULATOR_CHANGE_CURRENT 0x2
37 #define REGULATOR_CHANGE_MODE 0x4
38 #define REGULATOR_CHANGE_STATUS 0x8
39 #define REGULATOR_CHANGE_DRMS 0x10
40 #define REGULATOR_CHANGE_BYPASS 0x20
43 * operations in suspend mode
44 * DO_NOTHING_IN_SUSPEND - the default value
45 * DISABLE_IN_SUSPEND - turn off regulator in suspend states
46 * ENABLE_IN_SUSPEND - keep regulator on in suspend states
48 #define DO_NOTHING_IN_SUSPEND 0
49 #define DISABLE_IN_SUSPEND 1
50 #define ENABLE_IN_SUSPEND 2
52 /* Regulator active discharge flags */
53 enum regulator_active_discharge {
54 REGULATOR_ACTIVE_DISCHARGE_DEFAULT,
55 REGULATOR_ACTIVE_DISCHARGE_DISABLE,
56 REGULATOR_ACTIVE_DISCHARGE_ENABLE,
60 * struct regulator_state - regulator state during low power system states
62 * This describes a regulators state during a system wide low power
63 * state. One of enabled or disabled must be set for the
64 * configuration to be applied.
66 * @uV: Default operating voltage during suspend, it can be adjusted
67 * among <min_uV, max_uV>.
68 * @min_uV: Minimum suspend voltage may be set.
69 * @max_uV: Maximum suspend voltage may be set.
70 * @mode: Operating mode during suspend.
71 * @enabled: operations during suspend.
72 * - DO_NOTHING_IN_SUSPEND
73 * - DISABLE_IN_SUSPEND
75 * @changeable: Is this state can be switched between enabled/disabled,
77 struct regulator_state {
86 #define REGULATOR_NOTIF_LIMIT_DISABLE -1
87 #define REGULATOR_NOTIF_LIMIT_ENABLE -2
88 struct notification_limit {
95 * struct regulation_constraints - regulator operating constraints.
97 * This struct describes regulator and board/machine specific constraints.
99 * @name: Descriptive name for the constraints, used for display purposes.
101 * @min_uV: Smallest voltage consumers may set.
102 * @max_uV: Largest voltage consumers may set.
103 * @uV_offset: Offset applied to voltages from consumer to compensate for
106 * @min_uA: Smallest current consumers may set.
107 * @max_uA: Largest current consumers may set.
108 * @ilim_uA: Maximum input current.
109 * @system_load: Load that isn't captured by any consumer requests.
111 * @over_curr_limits: Limits for acting on over current.
112 * @over_voltage_limits: Limits for acting on over voltage.
113 * @under_voltage_limits: Limits for acting on under voltage.
114 * @temp_limits: Limits for acting on over temperature.
116 * @max_spread: Max possible spread between coupled regulators
117 * @max_uV_step: Max possible step change in voltage
118 * @valid_modes_mask: Mask of modes which may be configured by consumers.
119 * @valid_ops_mask: Operations which may be performed by consumers.
121 * @always_on: Set if the regulator should never be disabled.
122 * @boot_on: Set if the regulator is enabled when the system is initially
123 * started. If the regulator is not enabled by the hardware or
124 * bootloader then it will be enabled when the constraints are
126 * @apply_uV: Apply the voltage constraint when initialising.
127 * @ramp_disable: Disable ramp delay when initialising or when setting voltage.
128 * @soft_start: Enable soft start so that voltage ramps slowly.
129 * @pull_down: Enable pull down when regulator is disabled.
130 * @over_current_protection: Auto disable on over current event.
132 * @over_current_detection: Configure over current limits.
133 * @over_voltage_detection: Configure over voltage limits.
134 * @under_voltage_detection: Configure under voltage limits.
135 * @over_temp_detection: Configure over temperature limits.
137 * @input_uV: Input voltage for regulator when supplied by another regulator.
139 * @state_disk: State for regulator when system is suspended in disk mode.
140 * @state_mem: State for regulator when system is suspended in mem mode.
141 * @state_standby: State for regulator when system is suspended in standby
143 * @initial_state: Suspend state to set by default.
144 * @initial_mode: Mode to set at startup.
145 * @ramp_delay: Time to settle down after voltage change (unit: uV/us)
146 * @settling_time: Time to settle down after voltage change when voltage
147 * change is non-linear (unit: microseconds).
148 * @settling_time_up: Time to settle down after voltage increase when voltage
149 * change is non-linear (unit: microseconds).
150 * @settling_time_down : Time to settle down after voltage decrease when
151 * voltage change is non-linear (unit: microseconds).
152 * @active_discharge: Enable/disable active discharge. The enum
153 * regulator_active_discharge values are used for
155 * @enable_time: Turn-on time of the rails (unit: microseconds)
157 struct regulation_constraints {
161 /* voltage output range (inclusive) - for voltage control */
167 /* current output range (inclusive) - for current control */
174 /* used for coupled regulators */
177 /* used for changing voltage in steps */
180 /* valid regulator operating modes for this machine */
181 unsigned int valid_modes_mask;
183 /* valid operations for regulator on this machine */
184 unsigned int valid_ops_mask;
186 /* regulator input voltage - only if supply is another regulator */
189 /* regulator suspend states for global PMIC STANDBY/HIBERNATE */
190 struct regulator_state state_disk;
191 struct regulator_state state_mem;
192 struct regulator_state state_standby;
193 struct notification_limit over_curr_limits;
194 struct notification_limit over_voltage_limits;
195 struct notification_limit under_voltage_limits;
196 struct notification_limit temp_limits;
197 suspend_state_t initial_state; /* suspend state to set at init */
199 /* mode to set on startup */
200 unsigned int initial_mode;
202 unsigned int ramp_delay;
203 unsigned int settling_time;
204 unsigned int settling_time_up;
205 unsigned int settling_time_down;
206 unsigned int enable_time;
208 unsigned int active_discharge;
210 /* constraint flags */
211 unsigned always_on:1; /* regulator never off when system is on */
212 unsigned boot_on:1; /* bootloader/firmware enabled regulator */
213 unsigned apply_uV:1; /* apply uV constraint if min == max */
214 unsigned ramp_disable:1; /* disable ramp delay */
215 unsigned soft_start:1; /* ramp voltage slowly */
216 unsigned pull_down:1; /* pull down resistor when regulator off */
217 unsigned over_current_protection:1; /* auto disable on over current */
218 unsigned over_current_detection:1; /* notify on over current */
219 unsigned over_voltage_detection:1; /* notify on over voltage */
220 unsigned under_voltage_detection:1; /* notify on under voltage */
221 unsigned over_temp_detection:1; /* notify on over temperature */
225 * struct regulator_consumer_supply - supply -> device mapping
227 * This maps a supply name to a device. Use of dev_name allows support for
228 * buses which make struct device available late such as I2C.
230 * @dev_name: Result of dev_name() for the consumer.
231 * @supply: Name for the supply.
233 struct regulator_consumer_supply {
234 const char *dev_name; /* dev_name() for consumer */
235 const char *supply; /* consumer supply - e.g. "vcc" */
238 /* Initialize struct regulator_consumer_supply */
239 #define REGULATOR_SUPPLY(_name, _dev_name) \
242 .dev_name = _dev_name, \
246 * struct regulator_init_data - regulator platform initialisation data.
248 * Initialisation constraints, our supply and consumers supplies.
250 * @supply_regulator: Parent regulator. Specified using the regulator name
251 * as it appears in the name field in sysfs, which can
252 * be explicitly set using the constraints field 'name'.
254 * @constraints: Constraints. These must be specified for the regulator to
256 * @num_consumer_supplies: Number of consumer device supplies.
257 * @consumer_supplies: Consumer device supply configuration.
259 * @regulator_init: Callback invoked when the regulator has been registered.
260 * @driver_data: Data passed to regulator_init.
262 struct regulator_init_data {
263 const char *supply_regulator; /* or NULL for system supply */
265 struct regulation_constraints constraints;
267 int num_consumer_supplies;
268 struct regulator_consumer_supply *consumer_supplies;
270 /* optional regulator machine specific init */
271 int (*regulator_init)(void *driver_data);
272 void *driver_data; /* core does not touch this */
275 #ifdef CONFIG_REGULATOR
276 void regulator_has_full_constraints(void);
278 static inline void regulator_has_full_constraints(void)
283 static inline int regulator_suspend_prepare(suspend_state_t state)
287 static inline int regulator_suspend_finish(void)