On Tue, Apr 18, 2017 at 09:34:15AM +0200, Quentin Schulz wrote: > This is a series for AXP20X and AXP22X battery power supply without the > support for changing constant charge current from the DT. The patches for > supporting the constant charge current from DT are ready and will be sent > once the battery framework required to make this work has been merged. > > v6: > - removed mention to fixed battery in DT-binding documentation, > > Quote from v4 cover letter: > > The X-Powers AXP20X and AXP22X PMICs have multiple ADCs. They expose > information and data of the various power supplies they support such as > ACIN, battery and VBUS. For example, they expose the current battery > voltage, charge or discharge, as well as ACIN and VBUS current voltages > and currents, internal PMIC temperature and ADC on 2 different GPIOs > when in the right mode (for the AXP209 only). > > The ACIN power supply driver is added by this patch. The AXP20X and > AXP22X can both read the status and the "usability" of the power supply > but only the AXP209 will be able to tell the current current and voltage > of the power supply by reading ADC channels. It is simply not supported > by the AXP22X PMICs. > > The battery power supply driver is also added by this patch. The AXP20X > and AXP22X share most of their behaviour but have slight variations. The > allowed target voltages for battery charging are not the same, the > AXP22X PMIC are able to tell if the battery percentage computed by the > PMIC is trustworthy and they have different formulas for computing max > current for battery power supply. The driver is able to give the current > voltage and current of the battery (be it charging or discharging), the > maximal and minimal voltage and maximal current allowed for the battery, > whether the battery is present and usable and its capacity. It will get > the battery current current and voltage by reading the ADC channels. The > PMIC allows maximal voltages (4.36V for AXP20X and 4.22V and 4.24V for > AXP22X) that should not be used with Lithium-based batteries and since > this PMIC is supposed to be used with Lithium-based batteries, they have > been disabled. The values returned by the ADC driver are multipled by > 1000 to scale from the mV returned by the ADC to the uV expected by the > power supply framework. > > This series of patch adds DT bindings for ACIN power supply, ADC and > battery power supply drivers for AXP20X and AXP22X PMICs and their > documentation. It also enables the supported power supplies for the > Nextthing Co. CHIP and Sinlinx SinA33 boards. > > The different drivers are also added to the MFD cells of the AXP20X and > AXP22X cells and the writeable and volatile regs updated to work with > the newly added drivers. > > This series of patch is based on a previous upstreaming attempt done by > Bruno Prémont few months ago. It differs in three points: the ADC > driver does not tell the battery temperature (TS_IN) as I do not have a > board to test it with, it does not tell the instantaneous battery power > as it returns crazy values for me and finally no support for OCV curves > for the battery. > > You can test these patches from this repo and branch: > https://github.com/QSchulz/linux/tree/axp2xx_adc_batt_ac_v4 > > v4: > - added the ability to set maximum constant charge current from sysfs, > - added a warning when setting a higher than current maximum constant charge > current, > - set default to minimum possible value for current and maximum constant charge > current when no battery DT is present or invalid battery DT, > - fixed a forgotten custom formula to compute maximum constant charge current > for AXP22X, > - automatically lower the current constant charge current when it is higher > than the maximum constant charge current about to be set, > > v3: > - Removed DT property for constant charge current in favor of the WIP > battery framework as requested by Sebastian Reichel, > - Using a simple if condition instead of a switch in the ADC driver, > - Fixed error handling in ADC driver's probe, > - Fixed missing call to iio_map_array_unregister in the ADC driver's > remove, > - Removed ADC driver's DT node and documentation, > - Merged IIO channel mapping patches into the original ADC driver > patch, > - Removed `adding V-OFF to writeable reg' patch as it's already in > writeable reg range, > > v2: > - Some registers' name have been changed to better reflect their > purpose, > - Make VBUS power supply driver use IIO channels when AXP ADC driver is > enabled, but fall back on previous behavior when disabled. This is made > to avoid the ADC driver overwritting registers for VBUS power supply > ADC when removed, > - Removed useless adding of data registers to volatile registers, > - Reordered IIO channels, now grouped by same part of the PMIC (e.g. > voltage and current of the battery have the same index in different > IIO types), > - Added structures for specific data instead of matching on IDs, > - Switched from DT IIO channels mapping to iio_map structures IIO > channels mapping, > > Quentin > > Quentin Schulz (6): > dt-bindings: power: supply: add AXP20X/AXP22X battery DT binding > power: supply: add battery driver for AXP20X and AXP22X PMICs > ARM: dtsi: axp209: add battery power supply subnode > ARM: dtsi: axp22x: add battery power supply subnode > ARM: dts: sun8i: sina33: enable battery power supply subnode > ARM: sun5i: chip: enable battery power supply subnode Applied the last 4 patches. Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com
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