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c054c6c792
linux/drivers/regulator
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Maciej Purski c054c6c792
regulator: core: Add voltage balancing mechanism 
On Odroid XU3/4 and other Exynos5422 based boards there is a case, that
different devices on the board are supplied by different regulators
with non-fixed voltages. If one of these devices temporarily requires
higher voltage, there might occur a situation that the spread between
two devices' voltages is so high, that there is a risk of changing
'high' and 'low' states on the interconnection between devices powered
by those regulators.

Introduce new function regulator_balance_voltage(), which
keeps max_spread constraint fulfilled between a group of coupled
regulators. It should be called if a regulator changes its
voltage or after disabling or enabling. Disabled regulators should
follow changes of the enabled ones, but their consumers' demands
shouldn't be taken into account while calculating voltage of other
coupled regulators.

Find voltages, which are closest to suiting all the consumers' demands,
while fulfilling max_spread constraint, keeping the following rules:
- if one regulator is about to rise its voltage, rise others
  voltages in order to keep the max_spread
- if a regulator, which has caused rising other regulators, is
  lowered, lower other regulators if possible
- if one regulator is about to lower its voltage, but it hasn't caused
  rising other regulators, change its voltage so that it doesn't break the
  max_spread

Change regulators' voltages step by step, keeping max_spread constraint
fulfilled all the time. Function regulator_get_optimal_voltage()
should find the best possible change for the regulator, which doesn't
break max_spread constraint. In function regulator_balance_voltage()
optimize number of steps by finding highest voltage difference on
each iteration.

If a regulator, which is about to change its voltage, is not coupled,
method regulator_get_optimal_voltage() should simply return the lowest
voltage fulfilling consumers' demands.

Coupling should be checked only if the system is in PM_SUSPEND_ON state.

Signed-off-by: Maciej Purski <m.purski@samsung.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2018-11-08 12:38:23 +00:00
..
88pg86x.c regulator: 88pg86x: new i2c dual regulator chip 2018-03-09 13:01:17 +00:00
88pm800.c regulator: 88pm800: constify regulator_ops structures 2017-01-31 20:32:26 +00:00
88pm8607.c regulator: 88pm8607: constify regulator_ops structure 2017-01-31 20:32:53 +00:00
aat2870-regulator.c regulator: aat2870-regulator: constify regulator_ops structure 2017-01-31 20:35:49 +00:00
ab3100.c
ab8500-ext.c ARM: ux500: move ab8500_regulator_plat_data into driver 2016-07-12 11:23:50 +02:00
ab8500.c regulator: ab8500: Drop AB8540/9540 support 2018-04-16 13:08:59 +01:00
act8865-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
act8945a-regulator.c regulator: act8945a-regulator: constify regulator_ops structure 2017-01-31 20:36:10 +00:00
ad5398.c regulator: ad5398: constify regulator_ops structure 2017-01-31 20:38:27 +00:00
anatop-regulator.c regulator: anatop: Switch to SPDX identifier 2018-05-24 15:17:07 +01:00
arizona-ldo1.c regulator: Fetch enable gpiods nonexclusive 2018-10-15 10:48:59 +01:00
arizona-micsupp.c regulator: arizona-micsupp: Factor out generic initialization 2017-04-25 16:36:31 +01:00
as3711-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
as3722-regulator.c regulator: as3722: Constify regulator ops 2016-04-11 15:15:36 +01:00
axp20x-regulator.c regulator: axp20x: Mark expected switch fall-throughs 2018-10-04 15:02:19 +01:00
bcm590xx-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
bd718x7-regulator.c regulator: bd718x7: Remove struct bd718xx_pmic 2018-10-19 13:22:45 +01:00
bd9571mwv-regulator.c regulator: bd9571mwv: Make symbol 'dev_attr_backup_mode' static 2018-07-24 11:58:37 +01:00
core.c regulator: core: Add voltage balancing mechanism 2018-11-08 12:38:23 +00:00
cpcap-regulator.c regulator: Add support for CPCAP regulators on Motorola Xoom devices. 2018-07-24 15:37:08 +01:00
da903x.c regulator: da9*: constify regulator_ops structures 2015-12-22 23:59:57 +00:00
da9052-regulator.c regulator: da905{2,5}: Remove unnecessary array check 2018-09-20 18:28:09 -07:00
da9055-regulator.c regulator: da905{2,5}: Remove unnecessary array check 2018-09-20 18:28:09 -07:00
da9062-regulator.c regulator: da9061: BUCK and LDO regulator driver 2017-06-07 19:47:24 +01:00
da9063-regulator.c regulator: da9063: Handle less LDOs on DA9063L 2018-07-04 07:17:08 +01:00
da9210-regulator.c regulator: da9210: addition of device tree support 2016-07-15 11:45:26 +01:00
da9210-regulator.h
da9211-regulator.c regulator: Fetch enable gpiods nonexclusive 2018-10-15 10:48:59 +01:00
da9211-regulator.h regulator: da9211: update for supporting da9223/4/5 2017-10-31 11:01:14 +00:00
db8500-prcmu.c
dbx500-prcmu.c regulator: dbx500: remove unused functions in dbx500-prcmu.c 2016-09-26 09:40:22 -07:00
dbx500-prcmu.h
devres.c regulator: core: optimize devm_regulator_bulk_get() 2017-02-04 11:37:25 +01:00
dummy.c
dummy.h
fan53555.c regulator: fan53555: fix I2C device ids 2017-08-21 16:57:53 +01:00
fixed-helper.c regulator: fixed: Convert to use GPIO descriptor only 2018-09-17 14:32:22 -07:00
fixed.c regulator/gpio: Allow nonexclusive GPIO access 2018-10-12 18:55:02 +02:00
gpio-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
helpers.c regulator/mfd: Support for the ROHM BD71847 2018-09-28 15:07:30 +01:00
hi655x-regulator.c Merge remote-tracking branches 'regulator/topic/helpers', 'regulator/topic/hi655x', 'regulator/topic/lm363x', 'regulator/topic/ltc3589' and 'regulator/topic/ltc3676' into regulator-next 2017-04-30 22:17:31 +09:00
hi6421-regulator.c regulator: hi6421: Describe consumed platform device 2017-06-07 20:25:49 +01:00
hi6421v530-regulator.c regulator: hi6421v530: Describe consumed platform device 2017-06-14 18:27:20 +01:00
internal.h regulator: core: Parse coupled regulators properties 2018-05-17 16:05:48 +09:00
isl6271a-regulator.c regulator: drivers: Drop owner assignment from i2c_driver 2015-07-14 18:53:01 +01:00
isl9305.c regulator: isl9305: Add missing .owner field in regulator_desc 2018-08-28 19:41:36 +01:00
Kconfig regulator: lochnagar: Add support for the Cirrus Logic Lochnagar 2018-10-12 18:53:03 +02:00
lm363x-regulator.c regulator: Fetch enable gpiods nonexclusive 2018-10-15 10:48:59 +01:00
lochnagar-regulator.c regulator: lochnagar: Use a consisent comment style for SPDX header 2018-10-19 15:33:53 +01:00
lp872x.c regulator: lp872x: Add enable GPIO pin support 2016-02-05 18:57:09 +00:00
lp873x-regulator.c regulator: lp873x: Add support for populating input supply 2016-11-11 15:36:38 +00:00
lp3971.c regulator: lp3971: Silence uninitialized variable warning 2016-04-14 14:46:05 +01:00
lp3972.c regulator: lp3972: Silence uninitialized variable warning 2016-04-14 14:46:19 +01:00
lp8755.c regulator: lp8755: fix spelling mistake "acceess" -> "access" 2017-05-19 17:56:37 +01:00
lp8788-buck.c regulator: lp8788: constify regulator_ops structures 2015-12-23 00:01:23 +00:00
lp8788-ldo.c regulator: Fetch enable gpiods nonexclusive 2018-10-15 10:48:59 +01:00
lp87565-regulator.c regulator: lp87565: Enable LP87565_BUCK_CTRL_1_FPWM_MP_0_2 2018-04-17 10:57:21 +01:00
ltc3589.c regmap: split up regmap_config.use_single_rw 2018-09-07 13:03:55 +01:00
ltc3676.c regmap: split up regmap_config.use_single_rw 2018-09-07 13:03:55 +01:00
Makefile regulator: lochnagar: Add support for the Cirrus Logic Lochnagar 2018-10-12 18:53:03 +02:00
max1586.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
max8649.c
max8660.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
max8907-regulator.c regulator: max8907-regulator: constify regulator_ops structure 2017-01-31 20:54:26 +00:00
max8925-regulator.c regulator: max8925-regulator: constify regulator_ops structure 2017-01-31 20:54:41 +00:00
max8952.c regulator: Fetch enable gpiods nonexclusive 2018-10-15 10:48:59 +01:00
max8973-regulator.c regulator: Fetch enable gpiods nonexclusive 2018-10-15 10:48:59 +01:00
max8997-regulator.c regulator: Convert to using %pOFn instead of device_node.name 2018-08-28 19:41:35 +01:00
max8998.c regulator: maxim: Add SPDX license identifiers 2018-08-08 10:52:50 +01:00
max14577-regulator.c regulator: maxim: Add SPDX license identifiers 2018-08-08 10:52:50 +01:00
max77620-regulator.c regulator: max77620-regulator: constify regulator_ops structure 2017-01-31 20:52:52 +00:00
max77686-regulator.c regulator: maxim: Add SPDX license identifiers 2018-08-08 10:52:50 +01:00
max77693-regulator.c regulator: maxim: Add SPDX license identifiers 2018-08-08 10:52:50 +01:00
max77802-regulator.c regulator: maxim: Add SPDX license identifiers 2018-08-08 10:52:50 +01:00
mc13xxx-regulator-core.c regulator: Convert to using %pOFn instead of device_node.name 2018-08-28 19:41:35 +01:00
mc13xxx.h
mc13783-regulator.c regulator: Updates for v4.18 2018-06-08 13:08:57 -07:00
mc13892-regulator.c regulator: Updates for v4.18 2018-06-08 13:08:57 -07:00
mt6311-regulator.c regulator: mt6311: Use REGCACHE_RBTREE 2015-12-18 12:14:27 +00:00
mt6311-regulator.h regulator: mt6311: Add support for mt6311 regulator 2015-07-24 12:30:49 +01:00
mt6323-regulator.c regulator: mt6323: Constify struct regulator_ops 2016-07-19 18:31:59 +01:00
mt6380-regulator.c regulator: mt6380: Add support for MT6380 2017-08-15 12:50:48 +01:00
mt6397-regulator.c regulator: mt6397: Add buck change mode regulator interface for mt6397 2016-05-30 16:29:43 +01:00
of_regulator.c regulator: Fixes for 4.19 2018-09-28 14:50:33 +01:00
palmas-regulator.c Merge remote-tracking branches 'regulator/topic/settle', 'regulator/topic/tps65910' and 'regulator/topic/tps65917' into regulator-next 2017-07-03 16:52:21 +01:00
pbias-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
pcap-regulator.c regulator: pcap-regulator: constify regulator_ops structure 2017-01-31 20:57:31 +00:00
pcf50633-regulator.c regulator: pcf50633-regulator: constify regulator_ops structure 2017-01-31 20:58:15 +00:00
pfuze100-regulator.c regulator: pfuze100-regulator: fix spelling mistake "standy" -> "standby" 2018-09-17 10:38:43 -07:00
pv88060-regulator.c regulator: pv88060-regulator: constify regulator_ops structure 2017-01-31 20:58:46 +00:00
pv88060-regulator.h regulator: pv88060: new regulator driver 2015-11-20 18:06:15 +00:00
pv88080-regulator.c regulator: pv88080-regulator: constify regulator_ops structure 2017-01-31 20:59:01 +00:00
pv88080-regulator.h regulator: pv88080: Update regulator for PV88080 BB silicon support 2016-09-26 08:59:08 -07:00
pv88090-regulator.c regulator: pv88090: Exception handling for out of bounds 2017-08-30 16:12:17 +01:00
pv88090-regulator.h regulator: pv88090: Exception handling for out of bounds 2017-08-30 16:12:17 +01:00
pwm-regulator.c regulator: pwm-regulator: Remove unneeded gpiod NULL check 2017-07-24 16:26:35 +01:00
qcom_rpm-regulator.c regulator: qcom_rpm-regulator: add NULL check on of_match_device() return value 2017-07-07 13:42:03 +01:00
qcom_smd-regulator.c regulator: qcom: Add PMS405 regulators 2018-09-20 10:06:37 -07:00
qcom_spmi-regulator.c regulator: qcom_spmi: Indent with tabs instead of spaces 2018-07-20 17:40:57 +01:00
qcom-rpmh-regulator.c regulator: qcom-rpmh: Add stylistic breaks in the default cases 2018-08-28 21:19:36 +01:00
rc5t583-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
rk808-regulator.c regulator: rk808: Add regulator driver for RK805 2017-08-21 08:54:12 +01:00
rn5t618-regulator.c regulator: rn5t618: Do not index regulator_desc arrays by id 2017-10-18 11:23:21 +01:00
rt5033-regulator.c
s2mpa01.c regulator: samsung: Add SPDX license identifiers 2018-08-08 10:52:54 +01:00
s2mps11.c regulator: samsung: Add SPDX license identifiers 2018-08-08 10:52:54 +01:00
s5m8767.c regulator: Fetch enable gpiods nonexclusive 2018-10-15 10:48:59 +01:00
sc2731-regulator.c regulator: sc2731: Fix defines for SC2731_WR_UNLOCK and SC2731_PWR_WR_PROT_VALUE 2018-01-03 12:10:14 +00:00
sky81452-regulator.c
stm32-vrefbuf.c regulator: stm32-vrefbuf: fix check on ready flag 2018-02-08 15:28:35 +00:00
stpmic1_regulator.c regulator: stpmic1: Return REGULATOR_MODE_INVALID for invalid mode 2018-10-10 12:28:41 +01:00
stw481x-vmmc.c regulator: stw481x-vmmc: fix ages old enable error 2016-11-13 09:22:37 +00:00
sy8106a-regulator.c regulator: add support for SY8106A regulator 2018-05-09 18:25:06 +09:00
ti-abb-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
tps6105x-regulator.c regulator: tps6105x: Convert to use regmap helper functions 2015-11-18 13:19:47 +00:00
tps6507x-regulator.c regulator: tps6507x: Drop pointless static qualifier for *reg_data variable 2016-10-24 17:49:14 +01:00
tps6524x-regulator.c regulator: tps6524x: Fix broken use of spi_dev_get() 2016-04-20 17:37:59 +01:00
tps6586x-regulator.c regulator: tps6586x: Add support for TPS658624 2018-04-20 11:44:34 +01:00
tps51632-regulator.c regulator: tps51632: Fix setting ramp delay 2016-05-31 16:38:01 +01:00
tps62360-regulator.c regulator: drivers: Drop owner assignment from i2c_driver 2015-07-14 18:53:01 +01:00
tps65023-regulator.c regulator: tps65023: Fix inverted core enable logic. 2017-04-18 18:55:05 +01:00
tps65086-regulator.c regulator: tps65086: Fix DT node referencing in of_parse_cb 2017-02-13 18:04:28 +00:00
tps65090-regulator.c regulator: Fetch enable gpiods nonexclusive 2018-10-15 10:48:59 +01:00
tps65132-regulator.c regulator: tps65132: fix platform_no_drv_owner.cocci warnings 2017-04-14 17:59:32 +01:00
tps65217-regulator.c regulator: tps65217: Fix NULL pointer dereference on probe 2018-07-30 09:41:04 +01:00
tps65218-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
tps65910-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
tps65912-regulator.c headers: separate linux/mod_devicetable.h from linux/platform_device.h 2018-07-07 17:52:26 +02:00
tps80031-regulator.c treewide: devm_kzalloc() -> devm_kcalloc() 2018-06-12 16:19:22 -07:00
twl6030-regulator.c mfd: twl: Move header file out of I2C realm 2017-09-04 14:41:02 +01:00
twl-regulator.c regulator: Don't return or expect -errno from of_map_mode() 2018-04-20 12:45:36 +01:00
uniphier-regulator.c regulator: uniphier: add regulator driver for UniPhier SoC 2018-07-11 10:30:32 +01:00
userspace-consumer.c
vctrl-regulator.c regulator: vctrl: Fix out of bounds array access for vctrl->vtable 2017-04-14 18:01:03 +01:00
vexpress-regulator.c regulator: vexpress: rename vexpress regulator implementation 2016-02-15 21:01:52 +00:00
virtual.c
wm831x-dcdc.c Merge remote-tracking branch 'regulator/topic/wm831x' into regulator-next 2016-01-12 18:26:12 +00:00
wm831x-isink.c regulator: wm8*: constify regulator_ops structures 2015-12-23 00:00:00 +00:00
wm831x-ldo.c Merge remote-tracking branch 'regulator/topic/wm831x' into regulator-next 2016-01-12 18:26:12 +00:00
wm8350-regulator.c regulator: wm8350: fix missing increment of loop index i 2018-04-23 12:26:05 +01:00
wm8400-regulator.c regulator: wm8*: constify regulator_ops structures 2015-12-23 00:00:00 +00:00
wm8994-regulator.c regulator: wm8994: Fix shared GPIOs 2018-05-30 15:17:03 +01:00