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>

diff --git a/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts b/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts
index 15dc246e84e2bdeffcf11b9b5da0813990633676..cbda25f2ad1953ce7ffa4e4b79d875a4e5afa006 100644 (file)
--- a/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts
+++ b/arch/arm64/boot/dts/qcom/msm8916-samsung-serranove.dts
@@ -142,6 +142,12 @@
 
                        pinctrl-names = "default";
                        pinctrl-0 = <&muic_irq_default>;
+
+                       usb_con: connector {
+                               compatible = "usb-b-connector";
+                               label = "micro-USB";
+                               type = "micro";
+                       };
                };
        };
 
@@ -199,6 +205,15 @@
                        pinctrl-0 = <&nfc_default>;
                };
        };
+
+       battery: battery {
+               compatible = "simple-battery";
+               precharge-current-microamp = <450000>;
+               constant-charge-current-max-microamp = <1000000>;
+               charge-term-current-microamp = <150000>;
+               precharge-upper-limit-microvolt = <3500000>;
+               constant-charge-voltage-max-microvolt = <4350000>;
+       };
 };
 
 &blsp_i2c2 {
@@ -228,7 +243,7 @@
 &blsp_i2c4 {
        status = "okay";
 
-       battery@35 {
+       fuel-gauge@35 {
                compatible = "richtek,rt5033-battery";
                reg = <0x35>;
 
@@ -237,6 +252,8 @@
 
                pinctrl-names = "default";
                pinctrl-0 = <&fg_alert_default>;
+
+               power-supplies = <&rt5033_charger>;
        };
 };
 
@@ -261,6 +278,43 @@
        };
 };
 
+&blsp_i2c6 {
+       status = "okay";
+
+       pmic@34 {
+               compatible = "richtek,rt5033";
+               reg = <0x34>;
+
+               interrupt-parent = <&tlmm>;
+               interrupts = <62 IRQ_TYPE_EDGE_FALLING>;
+
+               pinctrl-names = "default";
+               pinctrl-0 = <&pmic_int_default>;
+
+               regulators {
+                       rt5033_reg_safe_ldo: SAFE_LDO {
+                               regulator-min-microvolt = <4900000>;
+                               regulator-max-microvolt = <4900000>;
+                               regulator-always-on;
+                       };
+                       rt5033_reg_ldo: LDO {
+                               regulator-min-microvolt = <2800000>;
+                               regulator-max-microvolt = <2800000>;
+                       };
+                       rt5033_reg_buck: BUCK {
+                               regulator-min-microvolt = <1200000>;
+                               regulator-max-microvolt = <1200000>;
+                       };
+               };
+
+               rt5033_charger: charger {
+                       compatible = "richtek,rt5033-charger";
+                       monitored-battery = <&battery>;
+                       richtek,usb-connector = <&usb_con>;
+               };
+       };
+};
+
 &blsp_uart2 {
        status = "okay";
 };
@@ -387,6 +441,14 @@
                bias-disable;
        };
 
+       pmic_int_default: pmic-int-default-state {
+               pins = "gpio62";
+               function = "gpio";
+
+               drive-strength = <2>;
+               bias-disable;
+       };
+
        tkey_default: tkey-default-state {
                pins = "gpio98";
                function = "gpio";