arm64: dts: qcom: msm8916-samsung-serranove: Add RT5033 PMIC with charger

arm64: dts: qcom: msm8916-samsung-serranove: Add RT5033 PMIC with charger

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>