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2013-11-13regulator: fixed: fix regulator_list_voltage() for regressionGuennadi Liakhovetski1-0/+3
Commit c368e5fc2a190923b786f2de3e79430ea3566a25 "regulator: fixed: get rid of {get|list}_voltage()" broke regulator_list_voltage() for the fixed regulator, because an earlier commit 5a523605afa7d3b54b2e7041f8c9e6bc39872a7e "regulator: core: provide fixed voltage in desc for single voltage rail" missed to add support for the fixed-voltage special case to that function. This patch fixes that regression. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-10-24Merge remote-tracking branch 'regulator/topic/optional' into regulator-nextMark Brown1-34/+15
2013-10-24Merge remote-tracking branch 'regulator/topic/fixed' into regulator-nextMark Brown1-1/+4
2013-10-24Merge remote-tracking branch 'regulator/topic/core' into regulator-nextMark Brown1-6/+70
2013-10-18regulator: core: Add ability to create a lookup alias for supplyCharles Keepax1-0/+170
These patches add the ability to create an alternative device on which a lookup for a certain supply should be conducted. A common use-case for this would be devices that are logically represented as a collection of drivers within Linux but are are presented as a single device from device tree. It this case it is necessary for each sub device to locate their supply data on the main device. Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-10-04regulator: core: Always warn when using a dummy regulatorMark Brown1-7/+2
This helps people spot if they have missed a supply from a device tree or equivalent data structure. Suggested-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-30regulator: core: Reduce busy-wait loopingThierry Reding1-5/+33
Keep busy-wait looping to a minimum while waiting for a regulator to ramp-up to the target voltage. This follows the guidelines set forth in Documentation/timers/timers-howto.txt and assumes that regulators are never enabled in atomic context. Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-24regulator: core: Always use return value when regulator_dev_lookup() failsMark Brown1-1/+2
Ensure that the return value is always set when we return now that the logic has changed for regulator_get_optional() so we don't get missing codes leaking out. Reported-by: Thierry Reding <treding@nvidia.com> Tested-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-23regulator: core: Fix return code for invalid parametersMark Brown1-1/+1
We should be returning an error, a repeated call will never succeed. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-20regulator: core: Fix default return value for _get()Mark Brown1-1/+1
Now that we are defaulting to providing dummy regulators fix the logic for substituting a dummy by making the default return code -EPROBE_DEFER. Reported-by: Thierry Reding <treding@nvidia.com> Tested-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-20regulator: core: set current constraints while setting machine constraintsLaxman Dewangan1-0/+34
Machine constraints is configured during regulator register. If current constraints are provided through machine constraints then it is observed that sometime the current configured on rail is out of range what machine constraint has. Set the current constraints when setting machine constraints to make sure that rail's current is within the range of given machine constraints. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-18regulator: core: add support for configuring turn-on time through constraintsLaxman Dewangan1-0/+2
The turn-on time of the regulator depends on the regulator device's electrical characteristics. Sometimes regulator turn-on time also depends on the capacitive load on the given platform and it can be more than the datasheet value. The driver provides the enable-time as per datasheet. Add support for configure the enable ramp time through regulator constraints so that regulator core can take this value for enable time for that regulator. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-17regulator: core: Remove unused regulator_use_dummy_regulator()Mark Brown1-17/+0
No boards have used this functionality and the new default of providing dummy regulators by default provides a better solution to the problem it was trying to solve. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-17regulator: core: Provide a dummy regulator with full constraintsMark Brown1-17/+19
When a system has said that it has fully specified constraints for its regulators it is still possible that some supplies may be missing, especially if regulator support has been added to a driver after the board was integrated. We can handle such situations more gracefully by providing a dummy regulator. Unless the caller has specifically indicated that the system design may not include a given regulator by using regulator_get_optional() or that it needs its interactions to have an effect using regulator_get_exclusive() provide a dummy regulator if we can't locate a real one. The kconfig option REGULATOR_DUMMY that provided similar behaviour for all regulators has been removed, systems that need it should flag that they have full constraints instead. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-17regulator: core: Split devres code out into a separate fileMark Brown1-251/+1
Cut down on the size of core.c a bit more and ensure that the devres versions of things don't do too much peering inside the internals of the APIs they wrap. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-17regulator: core: Refactor devm_regulator_get* APIsAxel Lin1-65/+62
The implementation of devm_regulator_get, devm_regulator_get_exclusive and devm_regulator_get_optional are almost the same. Introduce _devm_regulator_get helper function and refactor the code. Also move devm_regulator_get_exclusive to proper place, put it after regulator_get_exclusive() function. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-17regulator: core: Fix a trivial typoSachin Kamat1-1/+1
Changed automaticall -> automatically. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-17regulator: core: Provide managed regulator registrationMark Brown1-0/+66
Many regulator drivers have a remove function that consists solely of calling regulator_unregister() so provide a devm_regulator_register() in order to allow this repeated code to be removed and help eliminate error handling code. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-10regulator: core: provide fixed voltage in desc for single voltage railLaxman Dewangan1-1/+4
If given rail has the single voltage (n_voltages = 1) then provide the rail voltage through regulator descriptor so that core can use this value for finding voltage. This will avoid the implementation of the callback for get_voltage() or list_voltage() callback on regulator driver. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-09-01Merge remote-tracking branch 'regulator/topic/ramp' into regulator-nextMark Brown1-3/+4
2013-09-01Merge remote-tracking branch 'regulator/topic/optional' into regulator-nextMark Brown1-0/+89
2013-09-01Merge remote-tracking branch 'regulator/topic/helpers' into regulator-nextMark Brown1-427/+0
2013-09-01Merge remote-tracking branch 'regulator/topic/core' into regulator-nextMark Brown1-18/+26
2013-08-29regulator: Add devm_regulator_get_exclusive()Matthias Kaehlcke1-0/+30
Add a resource managed regulator_get_exclusive() Signed-off-by: Matthias Kaehlcke <matthias@kaehlcke.net> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-08-18regulator: core: Use bool for exclusivitity flagMark Brown1-3/+3
Just for neatness. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-08-09regulator: core: Move list_voltage_{linear,linear_range,table} to helpers.cAxel Lin1-86/+0
Move regulator_list_voltage_{linear,linear_range,table} helper functions to helpers.c. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-08-07regulator: core: Move helpers for drivers out into a separate fileMark Brown1-341/+0
Reduce the size of core.c a bit. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-08-07Merge remote-tracking branch 'regulator/topic/linear-range' into regulator-helpersMark Brown1-0/+95
2013-07-31regulator: core: Provide hints to the core about optional suppliesMark Brown1-0/+59
While the majority of supplies on devices are mandatory and can't be physically omitted for electrical reasons some devices do have optional supplies and need to know if they are missing, MMC being the most common of these. Currently the core accurately reports all errors when regulators are requested since it does not know if the supply is one that must be provided even if by a regulator software does not know about or if it is one that may genuinely be disconnected. In order to allow this behaviour to be changed and stub regulators to be provided in the former case add a new regulator request function regulator_get_optional() which provides a hint to the core that the regulator may genuinely not be connected. Currently the implementation is identical to the current behaviour, future patches will add support in the core for returning stub regulators in the case where normal regulator_get() fails and the board has requested it. Signed-off-by: Mark Brown <broonie@linaro.org> Acked-by: Chris Ball <cjb@laptop.org>
2013-07-25regulator: core: convert class code to use dev_groupsGreg Kroah-Hartman1-12/+16
The dev_attrs field of struct class is going away soon, dev_groups should be used instead. This converts the regulator class code to use the correct field. Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-18regulator: core: Ensure selector is mappedMark Brown1-0/+2
Clearly the testing only covered the bottom range. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-18regulator: core: Allow fixed voltage range in multiple linear rangesAxel Lin1-3/+9
Current code does not allow fixed voltage range in multiple linear ranges. If someone does set range->uV_step == 0 in one of the linear ranges, we hit divided by zero bug. This patch fixes this issue. For fixed voltage range, return any selector means the same voltage. Thus just return 0. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-18regulator: core: Use the power efficient workqueue for delayed powerdownMark Brown1-2/+3
There is no need to use a normal per-CPU workqueue for delayed power downs as they're not timing or performance critical and waking up a core for them would defeat some of the point. Signed-off-by: Mark Brown <broonie@linaro.org> Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Liam Girdwood <liam.r.girdwood@intel.com>
2013-07-15regulator: core: Remove redundant checksYadwinder Singh Brar1-3/+2
In function _regulator_do_set_voltage(), old_selector gets intialised only if (_regulator_is_enabled(rdev) && rdev->desc->ops->set_voltage_time_sel && rdev->desc->ops->get_voltage_sel)) is true. Before calling set_voltage_time_sel() we checks if (old_selector >= 0) and it will true if it got intialised properly. so we don't need to check again _regulator_is_enabled(rdev) && rdev->desc->ops->set_voltage_time_sel before calling set_voltage_time_sel(). Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-15regulator: core: Add support for disabling ramp delayYadwinder Singh Brar1-2/+4
Some hardwares support disabling ramp delay, so adding ramp_disable flag to constraints. It will be used to figure out whether ramp_delay in constraints is explicitly set to zero or its unintialized (zero by default). And we don't need to call set_voltage_time_sel() for regulators for whom ramp delay is disabled in constraints. Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-15regulator: core: Add helpers for multiple linear rangesMark Brown1-0/+87
Many regulators have several linear ranges of selector with different step sizes, for example offering better resolution at lower voltages. Provide regulator_{map,list}_voltage_linear_range() allowing these regulators to use generic code. To do so a table of regulator_linear_range structs needs to be pointed to from the descriptor. This was inspired by similar code included in a driver submission from Chao Xie and Yi Zhang at Marvell. Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-15regulator: core: Drop references on supply regulator when unregisteringMark Brown1-1/+4
Signed-off-by: Mark Brown <broonie@linaro.org>
2013-07-01Merge remote-tracking branch 'regulator/topic/linar' into regulator-nextMark Brown1-0/+15
2013-06-07regulator: core: add regulator_get_linear_step()Paul Walmsley1-0/+15
Add regulator_get_linear_step(), which returns the voltage step size between VSEL values for linear regulators. This is intended for use by regulator consumers which build their own voltage-to-VSEL tables. Signed-off-by: Paul Walmsley <pwalmsley@nvidia.com> Reviewed-by: Andrew Chew <achew@nvidia.com> Cc: Matthew Longnecker <mlongnecker@nvidia.com> Signed-off-by: Mark Brown <broonie@linaro.org>
2013-05-30Merge remote-tracking branch 'regulator/fix/doc' into regulator-linusMark Brown1-1/+4
2013-05-21regulator: core: Correct spelling mistake in commentCharles Keepax1-1/+1
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-05-02regulator: Fix kernel-doc generation warnings.Robert P. J. Day1-1/+4
Add a couple kernel-doc lines to get rid of kernel-doc generation warnings, no functional change. Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-04-28Merge remote-tracking branch 'regulator/topic/gpio' into v3.9-rc8Mark Brown1-19/+123
2013-04-28Merge remote-tracking branch 'regulator/topic/enable-invert' into v3.9-rc8Mark Brown1-4/+20
2013-04-28Merge remote-tracking branch 'regulator/topic/core' into v3.9-rc8Mark Brown1-3/+20
2013-04-18regulator: core: Add regulator_map_voltage_ascend() APIAxel Lin1-0/+31
A lot of regulator hardware has ascendant voltage list. This patch adds regulator_map_voltage_ascend() and export it. Drivers that have ascendant voltage list can use this as their map_voltage() operation, this is more efficient than default regulator_map_voltage_iterate() function. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-04-17regulator: core: return err value for regulator_get if there is no DT bindingNishanth Menon1-1/+10
commit 6d191a5fc7a969d972f1681e1c23781aecb06a61 (regulator: core: Don't defer probe if there's no DT binding for a supply) Attempted to differentiate between regulator_get() with an actual DT binding for the supply and when there is none to avoid unnecessary deferal. However, ret value supplied by regulator_dev_lookup() is being ignored by regulator_get(). So, exit with the appropriate return value. Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-04-05regulator: core: don't require a supply when supply_name is specifiedAndrew Bresticker1-1/+9
Regulator drivers may specify regulator_desc->supply_name which regulator_register() will use to find the supply node for a regulator. If no supply was specified in the device tree or the supply has yet to be registered regulator_register() will fail, deferring the probe of the regulator. In the case where no supply node was specified in the device tree, there is no supply and it is pointless to try and find one later, so go ahead and add the regulator without the supply. Signed-off-by: Andrew Bresticker <abrestic@chromium.org> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-03-25regulator: Fix typo in of_get_regulator function commentsMaxime Ripard1-1/+1
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
2013-03-05regulator: core: Add enable_is_inverted flag to indicate set enable_mask bits to disableAxel Lin1-4/+20
Add enable_is_inverted flag to indicate set enable_mask bits to disable when using regulator_enable_regmap and friends APIs. Signed-off-by: Axel Lin <axel.lin@ingics.com> Reviewed-by: Haojian Zhuang <haojian.zhuang@gmail.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
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