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Message-Id: <20250926053757.480086-4-joan.na@analog.com>
Date: Fri, 26 Sep 2025 14:37:57 +0900
From: Joan-Na-adi <joan.na.devcode@...il.com>
To: Liam Girdwood <lgirdwood@...il.com>
Cc: Mark Brown <broonie@...nel.org>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>,
linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org,
Joan Na <joan.na@...log.com>
Subject: [PATCH 3/3] dt-bindings: regulator: Add MAX77675 regulator binding
From: Joan Na <joan.na@...log.com>
Add device tree binding YAML schema for the Maxim MAX77675 PMIC regulator.
This defines the node properties and supported regulator names for use
in device tree sources.
Signed-off-by: Joan Na <joan.na@...log.com>
---
.../bindings/regulator/maxim,max77675.yaml | 202 ++++++++++++++++++
1 file changed, 202 insertions(+)
create mode 100644 Documentation/devicetree/bindings/regulator/maxim,max77675.yaml
diff --git a/Documentation/devicetree/bindings/regulator/maxim,max77675.yaml b/Documentation/devicetree/bindings/regulator/maxim,max77675.yaml
new file mode 100644
index 000000000000..f93dfdc499bc
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/maxim,max77675.yaml
@@ -0,0 +1,202 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/regulator/maxim,max77675.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Maxim MAX77675 PMIC Regulator
+
+maintainers:
+ - Joan Na <joan.na@...log.com>
+
+description: |
+ The MAX77675 is a PMIC providing multiple switching buck regulators
+ (SBB0–SBB3), accessible via I2C. Each SBB can be configured individually
+ in the Device Tree. Additional PMIC settings can be configured through
+ device-specific properties.
+ Users should use the macros from dt-bindings/regulator/maxim,max77675-regulator.h
+
+allOf:
+ - $ref: regulator.yaml#
+
+properties:
+ compatible:
+ const: maxim,max77675
+
+ reg:
+ maxItems: 1
+
+ maxim,dvs-slew-rate:
+ description: |
+ DVS slew rate setting.
+ 0 (MAX77675_DVS_SLEW_5MV) - 5 mV/μs
+ 1 (MAX77675_DVS_SLEW_10MV) - 10 mV/μs
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1]
+
+ maxim,latency-mode:
+ description: |
+ Latency mode for voltage transition:
+ 0 (MAX77675_LAT_MODE_HIGH_LATENCY) - Low quiescent current, high latency (~100μs)
+ 1 (MAX77675_LAT_MODE_LOW_LATENCY) - High quiescent current, low latency (~10μs)
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1]
+
+ maxim,drv-sbb-strength:
+ description: |
+ SIMO Buck-Boost Drive Strength Trim.
+ 0 (MAX77675_DRV_SBB_FASTEST) - Fastest transition (~0.6 ns)
+ 1 (MAX77675_DRV_SBB_FAST) - Faster transition (~1.2 ns)
+ 2 (MAX77675_DRV_SBB_MEDIUM) - Moderate transition (~1.8 ns)
+ 3 (MAX77675_DRV_SBB_SLOWEST) - Slowest transition (~8 ns)
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1, 2, 3]
+
+ maxim,manual-reset-time:
+ description: |
+ Manual reset time in seconds:
+ 0 (MAX77675_MRT_4S): 4 seconds
+ 1 (MAX77675_MRT_8S): 8 seconds
+ 2 (MAX77675_MRT_12S): 12 seconds
+ 3 (MAX77675_MRT_16S): 16 seconds
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1, 2, 3]
+
+ maxim,en-pullup-disable:
+ description: |
+ Disable internal pull-up for EN pin.
+ 0 (MAX77675_PU_EN): Internal pull-up enabled (default).
+ 1 (MAX77675_PU_DIS): Internal pull-up disabled.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1]
+
+ maxim,bias-low-power-request:
+ description: |
+ Controls the bias low-power mode setting.
+ 0 (MAX77675_BIAS_NORMAL): Normal bias operation
+ 1 (MAX77675_BIAS_LPM_REQ): Request low-power bias mode
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1]
+
+ maxim,simo-int-ldo-always-on:
+ description: |
+ SIMO internal channel disable configuration.
+ 0 (MAX77675_SIMO_INT_NORMAL): SIMO channel enabled
+ 1 (MAX77675_SIMO_INT_LDO): SIMO channel disabled
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1]
+
+ maxim,en-mode:
+ description: |
+ Enable mode configuration.
+ 0 (MAX77675_EN_PUSH_BUTTON): Push button
+ 1 (MAX77675_EN_SLIDE_SWITCH): Slide switch
+ 2 (MAX77675_EN_LOGIC): Logic mode
+ 3 (MAX77675_EN_RESERVED): Reserved
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1, 2, 3]
+
+ maxim,en-debounce-time:
+ description: |
+ Debounce timer enable.
+ 0 (MAX77675_DBEN_100US): 100us
+ 1 (MAX77675_DBEN_30MS): 30ms
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1]
+
+ regulators:
+ type: object
+ description: Regulator child nodes
+ patternProperties:
+ "^sbb[0-3]$":
+ type: object
+ $ref: regulator.yaml#
+ properties:
+ maxim,fps-slot:
+ description: |
+ FPS slot selection.
+ 0 (MAX77675_FPS_SLOT_0): FPS Slot 0
+ 1 (MAX77675_FPS_SLOT_1): FPS Slot 1
+ 2 (MAX77675_FPS_SLOT_2): FPS Slot 2
+ 3 (MAX77675_FPS_SLOT_3): FPS Slot 3
+ 4 (MAX77675_FPS_NONE): No FPS Slot (disabled)
+ 5 (MAX77675_FPS_DEF): Use the defaul
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1, 2, 3, 4, 5]
+
+ maxim,slew-rate-use-dvs:
+ description: |
+ 0 (MAX77675_SR_2MV_PER_US): Fixed slew rate of 2mV/μs.
+ 1 (MAX77675_SR_USE_DVS): Uses maxim,dvs-slew-rate for dynamic voltage scaling.
+ $ref: /schemas/types.yaml#/definitions/uint32
+ enum: [0, 1]
+ additionalProperties: false
+
+required:
+ - compatible
+ - reg
+ - regulators
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/regulator/maxim,max77675-regulator.h>
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ max77675: pmic@44 {
+ compatible = "maxim,max77675";
+ reg = <0x44>;
+
+ maxim,dvs-slew-rate = <MAX77675_DVS_SLEW_5MV>;
+ maxim,latency-mode = <MAX77675_LAT_MODE_HIGH_LATENCY>;
+ maxim,drv-sbb-strength = <MAX77675_DRV_SBB_FASTEST>;
+ maxim,manual-reset-time = <MAX77675_MRT_4S>;
+ maxim,en-pullup-disable = <MAX77675_PU_EN>;
+ maxim,bias-low-power-request = <MAX77675_BIAS_NORMAL>;
+ maxim,simo-int-ldo-always-on = <MAX77675_SIMO_INT_NORMAL>;
+ maxim,en-mode = <MAX77675_EN_PUSH_BUTTON>;
+ maxim,en-debounce-time = <MAX77675_DBEN_100US>;
+
+ regulators {
+ sbb0: sbb0 {
+ regulator-name = "sbb0";
+ regulator-min-microvolt = <500000>;
+ regulator-max-microvolt = <5500000>;
+ maxim,fps-slot = <MAX77675_FPS_DEF>;
+ maxim,slew-rate-use-dvs = <MAX77675_SR_2MV_PER_US>;
+ };
+
+ sbb1: sbb1 {
+ regulator-name = "sbb1";
+ regulator-min-microvolt = <500000>;
+ regulator-max-microvolt = <5500000>;
+ regulator-allow-set-voltage;
+ maxim,fps-slot = <MAX77675_FPS_DEF>;
+ maxim,slew-rate-use-dvs = <MAX77675_SR_2MV_PER_US>;
+ };
+
+ sbb2: sbb2 {
+ regulator-name = "sbb2";
+ regulator-min-microvolt = <500000>;
+ regulator-max-microvolt = <5500000>;
+ regulator-allow-set-voltage;
+ maxim,fps-slot = <MAX77675_FPS_DEF>;
+ maxim,slew-rate-use-dvs = <MAX77675_SR_2MV_PER_US>;
+ };
+
+ sbb3: sbb3 {
+ regulator-name = "sbb3";
+ regulator-min-microvolt = <500000>;
+ regulator-max-microvolt = <5500000>;
+ regulator-allow-set-voltage;
+ maxim,fps-slot = <MAX77675_FPS_DEF>;
+ maxim,slew-rate-use-dvs = <MAX77675_SR_2MV_PER_US>;
+ };
+ };
+ };
+ };
+
--
2.34.1
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