From: Quentin Schulz <quentin.schulz@free-electrons.com>
To: Chen-Yu Tsai <wens@csie.org>
Cc: "Jonathan Cameron" <jic23@kernel.org>,
knaack.h@gmx.de, "Lars-Peter Clausen" <lars@metafoo.de>,
"Peter Meerwald-Stadler" <pmeerw@pmeerw.net>,
"Rob Herring" <robh+dt@kernel.org>,
"Mark Rutland" <mark.rutland@arm.com>,
"Sebastian Reichel" <sre@kernel.org>,
"Russell King" <linux@armlinux.org.uk>,
"Maxime Ripard" <maxime.ripard@free-electrons.com>,
"Lee Jones" <lee.jones@linaro.org>,
linux-iio@vger.kernel.org,
devicetree <devicetree@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
"open list:THERMAL" <linux-pm@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
"Thomas Petazzoni" <thomas.petazzoni@free-electrons.com>,
"Icenowy Zheng" <icenowy@aosc.xyz>,
"Bruno Prémont" <bonbons@linux-vserver.org>
Subject: Re: [PATCH 17/22] power: supply: add battery driver for AXP20X and AXP22X PMICs
Date: Fri, 6 Jan 2017 09:29:07 +0100 [thread overview]
Message-ID: <b26272cc-d8c9-f213-ab66-a24d7bc30dc4@free-electrons.com> (raw)
In-Reply-To: <CAGb2v66XnWOGcaLeRo+cb6NGqfm_cyJVoK+GURUo5iV4pdZzew@mail.gmail.com>
Hi,
On 06/01/2017 04:39, Chen-Yu Tsai wrote:
> Hi,
>
> On Tue, Jan 3, 2017 at 12:37 AM, Quentin Schulz
> <quentin.schulz@free-electrons.com> wrote:
[...]
>> + case POWER_SUPPLY_PROP_CURRENT_MAX:
>> + ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, ®);
>> + if (ret)
>> + return ret;
>> +
>> + reg &= AXP20X_CHRG_CTRL1_TGT_CURR;
>> + val->intval = reg * 100000 + 300000;
>> + break;
>
>
> This controls the charge current. I believe the correct property to use
> is CONSTANT_CHARGE_CURRENT. And you should add CONSTANT_CHARGE_CURRENT_MAX
> which returns the highest possible setting.
>
ACK.
> Also letting the user control this might not always be a good idea.
> IIUC, LiPo batteries can only be charged at 1C, where C is the
> rated capacity (X mAh).
>
OK. Should I get the charge current from a DT property then?
Like "x-powers,charge-current = <300000>;"
It's close to what has been done in bq24257_charger for example.
[...]
>> +static enum power_supply_property axp20x_battery_props[] = {
>> + POWER_SUPPLY_PROP_PRESENT,
>> + POWER_SUPPLY_PROP_ONLINE,
>> + POWER_SUPPLY_PROP_STATUS,
>> + POWER_SUPPLY_PROP_VOLTAGE_NOW,
>> + POWER_SUPPLY_PROP_CURRENT_NOW,
>> + POWER_SUPPLY_PROP_CURRENT_MAX,
>> + POWER_SUPPLY_PROP_HEALTH,
>> + POWER_SUPPLY_PROP_VOLTAGE_MAX_DESIGN,
>> + POWER_SUPPLY_PROP_VOLTAGE_MIN_DESIGN,
>> + POWER_SUPPLY_PROP_CAPACITY,
>
> You can also add POWER_SUPPLY_PROP_TECHNOLOGY, which would return
> POWER_SUPPLY_TECHNOLOGY_LIPO.
>
Hum.. There are also POWER_SUPPLY_TECHNOLOGY_LION,
POWER_SUPPLY_TECHNOLOGY_LiFe and POWER_SUPPLY_TECHNOLOGY_LiMn which are
all Lithium-based batteries. From the datasheet, it can take a "single
cell Li-battery (Li-Ion/Polymer)". So I guess it's either
POWER_SUPPLY_TECHNOLOGY_LION or POWER_SUPPLY_TECHNOLOGY_LIPO.
> It is also possible to do POWER_SUPPLY_PROP_CHARGE_TYPE. According
> to the manual, if the battery is charging, it is in constant current
> mode (POWER_SUPPLY_CHARGE_TYPE_FAST) when V_battery < V_target.
> When V_battery == V_target, it is in constant voltage mode, though
> I don't think this is the same as POWER_SUPPLY_CHARGE_TYPE_TRICKLE.
> When it is not charging, you can return POWER_SUPPLY_CHARGE_TYPE_NONE.
>
ACK, I'll look into that.
Thanks,
Quentin
--
Quentin Schulz, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
next prev parent reply other threads:[~2017-01-06 8:29 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-02 16:37 [PATCH 00/22] add support for AXP20X and AXP22X power supply drivers Quentin Schulz
2017-01-02 16:37 ` [PATCH 01/22] dt-bindings: iio: adc: add AXP20X/AXP22X ADC DT binding Quentin Schulz
2017-01-03 23:20 ` Rob Herring
2017-01-05 4:05 ` Chen-Yu Tsai
2017-01-05 16:40 ` Maxime Ripard
2017-01-02 16:37 ` [PATCH 02/22] mfd: axp20x: add ADC data regs to volatile regs for AXP22X Quentin Schulz
2017-01-04 11:55 ` Lee Jones
2017-01-05 4:12 ` Chen-Yu Tsai
2017-01-02 16:37 ` [PATCH 03/22] iio: adc: add support for X-Powers AXP20X and AXP22X PMICs ADCs Quentin Schulz
2017-01-05 5:42 ` Chen-Yu Tsai
2017-01-05 8:06 ` Quentin Schulz
2017-01-05 8:27 ` Chen-Yu Tsai
2017-01-05 9:50 ` Quentin Schulz
2017-01-05 10:28 ` Chen-Yu Tsai
2017-01-07 19:23 ` Jonathan Cameron
2017-01-05 16:46 ` Maxime Ripard
2017-01-07 19:20 ` Jonathan Cameron
2017-01-05 16:51 ` Maxime Ripard
2017-01-07 19:13 ` Jonathan Cameron
2017-01-02 16:37 ` [PATCH 04/22] mfd: axp20x: add ADC cells for AXP20X and AXP22X PMICs Quentin Schulz
2017-01-04 11:56 ` Lee Jones
2017-01-04 11:56 ` Lee Jones
2017-01-05 5:51 ` Chen-Yu Tsai
2017-01-02 16:37 ` [PATCH 05/22] ARM: dtsi: axp209: add AXP209 ADC subnode Quentin Schulz
2017-01-05 5:51 ` Chen-Yu Tsai
2017-01-05 8:08 ` Quentin Schulz
2017-01-05 8:16 ` Chen-Yu Tsai
2017-01-02 16:37 ` [PATCH 06/22] ARM: dtsi: axp22x: add AXP22X " Quentin Schulz
2017-01-05 5:52 ` Chen-Yu Tsai
2017-01-02 16:37 ` [PATCH 07/22] dt-bindings: power: supply: add AXP20X/AXP22X AC power supply Quentin Schulz
2017-01-04 13:14 ` Rob Herring
2017-01-05 6:17 ` Chen-Yu Tsai
2017-01-07 19:26 ` Jonathan Cameron
2017-01-02 16:37 ` [PATCH 08/22] power: supply: add AC power supply driver for AXP20X and AXP22X PMICs Quentin Schulz
2017-01-07 19:31 ` Jonathan Cameron
2017-01-08 10:41 ` Quentin Schulz
2017-01-17 3:00 ` Sebastian Reichel
2017-01-26 13:32 ` Quentin Schulz
2017-01-27 8:20 ` Maxime Ripard
2017-01-28 14:30 ` Jonathan Cameron
2017-01-29 15:16 ` Sebastian Reichel
2017-01-02 16:37 ` [PATCH 09/22] mfd: axp20x: add AC power supply cells for " Quentin Schulz
2017-01-04 11:57 ` Lee Jones
2017-01-02 16:37 ` [PATCH 10/22] ARM: dtsi: axp209: add AC power supply subnode Quentin Schulz
2017-01-02 16:37 ` [PATCH 11/22] ARM: dtsi: axp22x: " Quentin Schulz
2017-01-02 16:37 ` [PATCH 12/22] ARM: dts: sun8i: sina33: enable ACIN " Quentin Schulz
2017-01-02 16:37 ` [PATCH 13/22] ARM: sun5i: chip: " Quentin Schulz
2017-01-02 16:37 ` [PATCH 14/22] dt-bindings: power: supply: add AXP20X/AXP22X battery DT binding Quentin Schulz
2017-01-04 13:21 ` Rob Herring
2017-01-07 19:33 ` Jonathan Cameron
2017-01-08 10:48 ` Quentin Schulz
2017-01-08 10:59 ` Jonathan Cameron
2017-01-02 16:37 ` [PATCH 15/22] mfd: axp20x: add CHRG_CTRL1 to writeable regs for AXP20X/AXP22X Quentin Schulz
2017-01-04 11:57 ` Lee Jones
2017-01-05 6:10 ` Chen-Yu Tsai
2017-01-05 8:10 ` Quentin Schulz
2017-01-02 16:37 ` [PATCH 16/22] mfd: axp20x: add V_OFF to writeable regs for AXP20X and AXP22X Quentin Schulz
2017-01-04 11:57 ` Lee Jones
2017-01-05 6:02 ` Chen-Yu Tsai
2017-01-02 16:37 ` [PATCH 17/22] power: supply: add battery driver for AXP20X and AXP22X PMICs Quentin Schulz
2017-01-05 17:02 ` Maxime Ripard
2017-01-05 17:34 ` Ezequiel Garcia
2017-01-06 2:46 ` Sebastian Reichel
2017-01-06 3:39 ` Chen-Yu Tsai
2017-01-06 8:29 ` Quentin Schulz [this message]
2017-01-17 3:46 ` Sebastian Reichel
2017-01-02 16:37 ` [PATCH 18/22] mfd: axp20x: add MFD cells for AXP20X and AXP22X battery driver Quentin Schulz
2017-01-04 11:57 ` Lee Jones
2017-01-02 16:37 ` [PATCH 19/22] ARM: dtsi: axp209: add battery power supply subnode Quentin Schulz
2017-01-02 16:37 ` [PATCH 20/22] ARM: dtsi: axp22x: " Quentin Schulz
2017-01-02 16:37 ` [PATCH 21/22] ARM: dts: sun8i: sina33: enable " Quentin Schulz
2017-01-02 16:37 ` [PATCH 22/22] ARM: sun5i: chip: " Quentin Schulz
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