[PATCH v7 1/6] dt-bindings: mfd: add pf1550

Samuel Kayode via B4 Relay
2025-06-12T14:59:20Z

From: Samuel Kayode <samuel.kayode@savoirfairelinux.com>

Add a DT binding document for pf1550 PMIC. This describes the core mfd
device along with its children: regulators, charger and onkey.

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Samuel Kayode <samuel.kayode@savoirfairelinux.com>
---
v5:
- Address Krzystof's feedback:
- Drop monitored battery ref already included in power supply schema
- Move `additionalProperties` close to `type` for regulator
- Drop unneccessary |
- Change `additionalProperties` to `unevaluatedProperties` for the
PMIC
v4:
- Address Krzystof's feedback:
- Filename changed to nxp,pf1550.yaml
- Replace Freescale with NXP
- Define include before battery-cell
- Drop operating-range-celsius in example since
nxp,thermal-regulation-celsisus already exists
- Not sure if there is similar binding to thermal-regulation...
for regulating temperature on thermal-zones? @Sebastian and @Krzysztof
v3:
- Address Krzysztof's feedback:
- Fold charger and onkey objects
- Drop compatible for sub-devices: onkey, charger and regulator.
- Drop constant voltage property already included in
monitored-battery
- Fix whitespace warnings
- Fix license
v2:
- Add yamls for the PMIC and the sub-devices
---
.../devicetree/bindings/mfd/nxp,pf1550.yaml | 137 +++++++++++++++++++++
1 file changed, 137 insertions(+)

diff --git a/Documentation/devicetree/bindings/mfd/nxp,pf1550.yaml b/Documentation/devicetree/bindings/mfd/nxp,pf1550.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..a0b412c3468a3d8972e5c129387c5417933c78e3
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/nxp,pf1550.yaml
@@ -0,0 +1,137 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mfd/nxp,pf1550.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP PF1550 Power Management IC
+
+maintainers:
+ - Samuel Kayode <samuel.kayode@savoirfairelinux.com>
+
+description:
+ PF1550 PMIC provides battery charging and power supply for low power IoT and
+ wearable applications. This device consists of an i2c controlled MFD that
+ includes regulators, battery charging and an onkey/power button.
+
+$ref: /schemas/power/supply/power-supply.yaml
+
+properties:
+ compatible:
+ const: nxp,pf1550
+
+ reg:
+ maxItems: 1
+
+ interrupts:
+ maxItems: 1
+
+ wakeup-source: true
+
+ regulators:
+ type: object
+ additionalProperties: false
+
+ patternProperties:
+ "^(ldo[1-3]|sw[1-3]|vrefddr)$":
+ type: object
+ $ref: /schemas/regulator/regulator.yaml
+ description:
+ regulator configuration for ldo1-3, buck converters(sw1-3)
+ and DDR termination reference voltage (vrefddr)
+ unevaluatedProperties: false
+
+ monitored-battery:
+ description: |
+ A phandle to a monitored battery node that contains a valid value
+ for:
+ constant-charge-voltage-max-microvolt.
+
+ nxp,thermal-regulation-celsius:
+ description:
+ Temperature threshold for thermal regulation of charger in celsius.
+ enum: [ 60, 75, 90, 105 ]
+
+ nxp,min-system-microvolt:
+ description:
+ System specific lower limit voltage.
+ enum: [ 3500000, 3700000, 4300000 ]
+
+required:
+ - compatible
+ - reg
+ - interrupts
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/interrupt-controller/irq.h>
+ #include <dt-bindings/input/linux-event-codes.h>
+
+ battery: battery-cell {
+ compatible = "simple-battery";
+ constant-charge-voltage-max-microvolt = <4400000>;
+ };
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ pmic@8 {
+ compatible = "nxp,pf1550";
+ reg = <0x8>;
+
+ interrupt-parent = <&gpio1>;
+ interrupts = <2 IRQ_TYPE_LEVEL_LOW>;
+ wakeup-source;
+ monitored-battery = <&battery>;
+ nxp,min-system-microvolt = <4300000>;
+ nxp,thermal-regulation-celsius = <75>;
+
+ regulators {
+ sw1_reg: sw1 {
+ regulator-name = "sw1";
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <1387500>;
+ regulator-always-on;
+ regulator-ramp-delay = <6250>;
+ };
+
+ sw2_reg: sw2 {
+ regulator-name = "sw2";
+ regulator-min-microvolt = <600000>;
+ regulator-max-microvolt = <1387500>;
+ regulator-always-on;
+ };
+
+ sw3_reg: sw3 {
+ regulator-name = "sw3";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-always-on;
+ };
+
+ vldo1_reg: ldo1 {
+ regulator-name = "ldo1";
+ regulator-min-microvolt = <750000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-always-on;
+ };
+
+ vldo2_reg: ldo2 {
+ regulator-name = "ldo2";
+ regulator-min-microvolt = <1800000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-always-on;
+ };
+
+ vldo3_reg: ldo3 {
+ regulator-name = "ldo3";
+ regulator-min-microvolt = <750000>;
+ regulator-max-microvolt = <3300000>;
+ regulator-always-on;
+ };
+ };
+ };
+ };

--
2.49.0