From 05a0fe8e43c876ffd2befb5a406d3baf3179b9fe Mon Sep 17 00:00:00 2001 From: Joan Na Date: Sun, 7 Dec 2025 12:29:06 +0900 Subject: [PATCH] regulator: dt-bindings: Add MAX77675 regulator Add device tree binding YAML schema for the Maxim MAX77675 PMIC regulator. Signed-off-by: Joan Na Reviewed-by: Rob Herring (Arm) Link: https://patch.msgid.link/20251207032907.4850-2-joan.na@analog.com Signed-off-by: Mark Brown --- .../bindings/regulator/adi,max77675.yaml | 184 ++++++++++++++++++ 1 file changed, 184 insertions(+) create mode 100644 Documentation/devicetree/bindings/regulator/adi,max77675.yaml diff --git a/Documentation/devicetree/bindings/regulator/adi,max77675.yaml b/Documentation/devicetree/bindings/regulator/adi,max77675.yaml new file mode 100644 index 0000000000000..c138e61380a43 --- /dev/null +++ b/Documentation/devicetree/bindings/regulator/adi,max77675.yaml @@ -0,0 +1,184 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/regulator/adi,max77675.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Maxim MAX77675 PMIC Regulator + +maintainers: + - Joan Na + +description: + The MAX77675 is a Power Management IC providing four switching buck + regulators (SBB0–SBB3) accessible via I2C. It supports configuration + of output voltages and enable controls for each regulator. + +allOf: + - $ref: /schemas/input/input.yaml + - $ref: /schemas/pinctrl/pincfg-node.yaml + +properties: + compatible: + const: adi,max77675 + + reg: + maxItems: 1 + + reset-time-sec: + description: Manual reset time in seconds + enum: [4, 8, 12, 16] + default: 4 + + bias-disable: + type: boolean + description: Disable internal pull-up for EN pin + + input-debounce: + description: Debounce time for the enable pin, in microseconds + items: + - enum: [100, 30000] + default: 100 + + adi,en-mode: + description: | + Enable mode configuration. + The debounce time set by 'input-debounce' applies to + both push-button and slide-switch modes. + "push-button" - A long press triggers power-on or power-down + "slide-switch" - Low : powers on, High : powers down + "logic" - Low : powers on, High : powers down (no debounce time) + $ref: /schemas/types.yaml#/definitions/string + enum: [push-button, slide-switch, logic] + default: slide-switch + + adi,voltage-change-latency-us: + description: + Specifies the delay (in microseconds) between an output voltage change + request and the start of the SBB voltage ramp. + enum: [10, 100] + default: 100 + + adi,drv-sbb-strength: + description: | + SIMO Buck-Boost Drive Strength Trim. + Controls the drive strength of the SIMO regulator's power MOSFETs. + This setting affects switching speed, impacting power efficiency and EMI. + "max" – Maximum drive strength (~0.6 ns transition time) + "high" – High drive strength (~1.2 ns transition time) + "low" – Low drive strength (~1.8 ns transition time) + "min" – Minimum drive strength (~8 ns transition time) + $ref: /schemas/types.yaml#/definitions/string + enum: [max, high, low, min] + default: max + + adi,dvs-slew-rate-mv-per-us: + description: + Dynamic rising slew rate for output voltage transitions, in mV/μs. + This setting is only used when 'adi,fixed-slew-rate' is not present. + enum: [5, 10] + default: 5 + + adi,bias-low-power-request: + type: boolean + description: Request low-power bias mode + + adi,simo-ldo-always-on: + type: boolean + description: Set internal LDO to always supply 1.8V + + regulators: + type: object + description: Regulator child nodes + patternProperties: + "^sbb[0-3]$": + type: object + $ref: regulator.yaml# + properties: + adi,fps-slot: + description: | + FPS (Flexible Power Sequencer) slot selection. + The Flexible Power Sequencer allows resources to power up under + hardware or software control. Additionally, each resource can + power up independently or among a group of other regulators with + adjustable power-up and power-down slots. + "slot0" - Assign to FPS Slot 0 + "slot1" - Assign to FPS Slot 1 + "slot2" - Assign to FPS Slot 2 + "slot3" - Assign to FPS Slot 3 + "default" - Use the default FPS slot value stored in register + $ref: /schemas/types.yaml#/definitions/string + enum: [slot0, slot1, slot2, slot3, default] + default: default + + adi,fixed-slew-rate: + type: boolean + description: + When this property is present, the device uses a constant 2 mV/μs + slew rate and ignores any dynamic slew rate configuration. + When absent, the device uses the dynamic slew rate specified + by 'adi,dvs-slew-rate-mv-per-us' + + unevaluatedProperties: false + +required: + - compatible + - reg + - regulators + +additionalProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + max77675: pmic@44 { + compatible = "adi,max77675"; + reg = <0x44>; + + reset-time-sec = <4>; + input-debounce = <100>; + + adi,en-mode = "slide-switch"; + adi,voltage-change-latency-us = <100>; + adi,drv-sbb-strength = "max"; + adi,dvs-slew-rate-mv-per-us = <5>; + + regulators { + sbb0: sbb0 { + regulator-name = "sbb0"; + regulator-min-microvolt = <500000>; + regulator-max-microvolt = <5500000>; + adi,fps-slot = "default"; + adi,fixed-slew-rate; + }; + + sbb1: sbb1 { + regulator-name = "sbb1"; + regulator-min-microvolt = <500000>; + regulator-max-microvolt = <5500000>; + adi,fps-slot = "default"; + adi,fixed-slew-rate; + }; + + sbb2: sbb2 { + regulator-name = "sbb2"; + regulator-min-microvolt = <500000>; + regulator-max-microvolt = <5500000>; + adi,fps-slot = "default"; + adi,fixed-slew-rate; + }; + + sbb3: sbb3 { + regulator-name = "sbb3"; + regulator-min-microvolt = <500000>; + regulator-max-microvolt = <5500000>; + adi,fps-slot = "default"; + adi,fixed-slew-rate; + }; + }; + }; + }; + -- 2.47.3