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For the regulators, apply the same settings as in the downstream devicetree [1], including the "regulator-always-on" for the SAFE_LDO. For the voltage of SAFE_LDO, however, there is only one voltage of 4.9 V available in the mainline driver [2][3]. The values of the battery data evolve from following sources: - precharge current: 450 mA corresponds to the default value of the chip. It doesn't get changed by the downstream Android driver. Therefore let's stick to this value. - constant charge current: The 1000 mA are taken from the downstream devicetree of the serranove battery. It's not easy to spot. The value is in the line "input_current_limit" [4]. The rows are according to the power supply type, the 4th value stands for "main supply" [5]. That's the value used by the Android driver when a charging cable is plugged into the device. - charge termination current: In the downstream devicetree of the battery that's the line "full_check_current_1st", which contains the 150 mA [6]. - precharge voltage: This one doesn't get set in the downstream Android driver. The chip's default is 2.8 V. That seemed too low to have a notable effect of handling the battery gentle. The chosen value of 3.5 V is a bit arbitrary and possibly rather high. As the device is already several years old and therefore most batteries too, a value on the safe side seems reasonable. - constant charge voltage: The value of 4.35 V is set in the line "chg_float_voltage" of the downstream battery devicetree [7]. The "connector" sub-node in the extcon node, the "battery" node in the general section and the line "power-supplies" in the fuel-gauge node result from the way of implementation documented in the dt-bindings of rt5033-charger [8] and mfd rt5033 [9]. [1] https://github.com/msm8916-mainline/linux-downstream/blob/GT-I9195I/arch/arm/boot/dts/samsung/msm8916/msm8916-sec-serranovelte-eur-r03.dtsi#L135-L181 [2] https://github.com/torvalds/linux/blob/v6.3/include/linux/mfd/rt5033-private.h#L211-L212 [3] https://github.com/torvalds/linux/blob/v6.3/drivers/regulator/rt5033-regulator.c#L83 [4] https://github.com/msm8916-mainline/linux-downstream/blob/GT-I9195I/arch/arm/boot/dts/samsung/msm8916/msm8916-sec-serranovelte-battery-r01.dtsi#L100 [5] https://github.com/msm8916-mainline/linux-downstream/blob/GT-I9195I/include/linux/power_supply.h#L173-L177 [6] https://github.com/msm8916-mainline/linux-downstream/blob/GT-I9195I/arch/arm/boot/dts/samsung/msm8916/msm8916-sec-serranovelte-battery-r01.dtsi#L102 [7] https://github.com/msm8916-mainline/linux-downstream/blob/GT-I9195I/arch/arm/boot/dts/samsung/msm8916/msm8916-sec-serranovelte-battery-r01.dtsi#L95 [8] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/devicetree/bindings/power/supply/richtek,rt5033-charger.yaml?h=next-20230616 [9] https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/devicetree/bindings/mfd/richtek,rt5033.yaml?h=next-20230616 Signed-off-by: Jakob Hauser <jahau@rocketmail.com> Link: https://lore.kernel.org/r/20230619203743.8136-1-jahau@rocketmail.com Signed-off-by: Bjorn Andersson <andersson@kernel.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.