[PATCH v7 1/3] dt-bindings: mfd: twl: Add missing sub-nodes for TWL4030 & TWL603x

Jihed Chaibi
2025-09-10T16:07:24Z

Update the main TI TWL-family binding to be self-contained and to fix
pre-existing validation errors.

To ensure future patches are bisectable, child nodes whose bindings
are in other patches (audio, keypad, usb, etc.) are now defined using
a flexible 'additionalProperties: true' pattern. This removes hard
dependencies between the MFD and subsystem bindings.

The complete dtbs_check for this binding is clean except for two
warnings originating from pre-existing bugs in the OMAP DTS files,
for which fixes have already been submitted separately [1][2].

Signed-off-by: Jihed Chaibi <jihed.chaibi.dev@gmail.com>

---
Changes in v7:
- Moved twl4030/twl6030-specific child node definitions (audio, usb..)
into the conditional 'if/then' block to improve schema accuracy.

Changes in v6:
- Refactored the ti,twl4030-power compatible schema to be much stricter,
removing obsolete board-specific compatibles (-n900, -beagleboard-xm),
that were added in v5. The schema now only permits specific, valid
fallback combinations. This change is supported by subsequent patches
in the same series (2/3) & (3/3), which update the affected DTS files.
- Enforced the presence of the compatible property on all relevant
sub-nodes by adding 'required: - compatible', closing a key validation
loophole.
- Applied various formatting cleanups for readability and correctness.

Changes in v5:
- Restructured the entire binding to define properties at the top
level instead of if/then blocks, per maintainer feedback.
- Added specific compatible enums for new child nodes instead of a
generic 'compatible: true'.
- Set 'unevaluatedProperties: false' for 'pwm' and 'pwmled' nodes to
enforce strict validation.
- Expanded 'power' node compatible enum to include all board-specific
compatible strings (used in existing device trees, e.g. OMAP3-based
boards) for more complete coverage.
- Corrected the schema for the 'power' node compatible to properly
handle single and fallback entries.

Changes in v4:
- Reworked binding to be independent and bisectable per maintainer
feedback by using 'additionalProperties: true' for child nodes.
- Added board-specific compatibles to the 'power' node enum.
- Added definitions for 'clocks' and 'clock-names' properties.
- Renamed 'twl6030-usb' child node to 'usb-comparator' to match
existing Device Tree usage (twl6030.dtsi).
- Fixed some spelling/grammar erros in the description.

Changes in v3:
- New patch to consolidate simple bindings (power, pwm) and add
definitions for all child nodes to fix dtbs_check validation
errors found in v2.

Changes in v2:
- This patch is split from larger series [3] per maintainer feedback.
- Added missing sub-node definitions, resolving dtbs_check errors.

[1] https://lore.kernel.org/all/20250822222530.113520-1-jihed.chaibi.dev@gmail.com/
[2] https://lore.kernel.org/all/20250822225052.136919-1-jihed.chaibi.dev@gmail.com/
[3] https://lore.kernel.org/all/20250816021523.167049-1-jihed.chaibi.dev@gmail.com/
---
.../devicetree/bindings/mfd/ti,twl.yaml | 232 +++++++++++++++++-
.../devicetree/bindings/mfd/twl4030-power.txt | 48 ----
.../devicetree/bindings/pwm/ti,twl-pwm.txt | 17 --
.../devicetree/bindings/pwm/ti,twl-pwmled.txt | 17 --
4 files changed, 221 insertions(+), 93 deletions(-)
delete mode 100644 Documentation/devicetree/bindings/mfd/twl4030-power.txt
delete mode 100644 Documentation/devicetree/bindings/pwm/ti,twl-pwm.txt
delete mode 100644 Documentation/devicetree/bindings/pwm/ti,twl-pwmled.txt

diff --git a/Documentation/devicetree/bindings/mfd/ti,twl.yaml b/Documentation/devicetree/bindings/mfd/ti,twl.yaml
index f162ab60c09b..95238a10ecda 100644
--- a/Documentation/devicetree/bindings/mfd/ti,twl.yaml
+++ b/Documentation/devicetree/bindings/mfd/ti,twl.yaml
@@ -9,11 +9,13 @@ title: Texas Instruments TWL family
maintainers:
- Andreas Kemnade <andreas@kemnade.info>

-description: |
+description: >
The TWLs are Integrated Power Management Chips.
- Some version might contain much more analog function like
+
+ Some versions might contain much more analog functionality like
USB transceiver or Audio amplifier.
- These chips are connected to an i2c bus.
+
+ These chips are connected to an I2C bus.

allOf:
- if:
@@ -62,6 +64,7 @@ allOf:
pwrbutton:
type: object
additionalProperties: false
+
properties:
compatible:
const: ti,twl4030-pwrbutton
@@ -73,9 +76,109 @@ allOf:
watchdog:
type: object
additionalProperties: false
+
properties:
compatible:
const: ti,twl4030-wdt
+
+ audio:
+ type: object
+ additionalProperties: true
+
+ properties:
+ compatible:
+ const: ti,twl4030-audio
+
+ required:
+ - compatible
+
+ keypad:
+ type: object
+ additionalProperties: true
+
+ properties:
+ compatible:
+ const: ti,twl4030-keypad
+
+ required:
+ - compatible
+
+ twl4030-usb:
+ type: object
+ additionalProperties: true
+
+ properties:
+ compatible:
+ const: ti,twl4030-usb
+
+ required:
+ - compatible
+
+ gpio:
+ type: object
+ additionalProperties: true
+
+ properties:
+ compatible:
+ const: ti,twl4030-gpio
+
+ required:
+ - compatible
+
+ power:
+ type: object
+ additionalProperties: false
+ description: >
+ The power management module inside the TWL4030 provides several
+ facilities to control the power resources, including power scripts.
+
+ For now, the binding only supports the complete shutdown of the
+ system after poweroff.
+
+ Board-specific compatible strings may be used for platform-specific
+ power configurations.
+
+ A board-specific compatible string (e.g., ti,twl4030-power-omap3-evm)
+ may be paired with a generic fallback (generally for power saving mode).
+
+ properties:
+ compatible:
+ oneOf:
+ # Case 1: A single compatible string is provided.
+ - enum:
+ - ti,twl4030-power
+ - ti,twl4030-power-reset
+ - ti,twl4030-power-idle
+ - ti,twl4030-power-idle-osc-off
+ - ti,twl4030-power-omap3-sdp
+ - ti,twl4030-power-omap3-ldp
+ - ti,twl4030-power-omap3-evm
+
+ # Case 2: The specific, valid fallback for 'idle-osc-off'.
+ - items:
+ - const: ti,twl4030-power-idle-osc-off
+ - const: ti,twl4030-power-idle
+
+ # Case 3: The specific, valid fallback for 'omap3-evm'.
+ - items:
+ - const: ti,twl4030-power-omap3-evm
+ - const: ti,twl4030-power-idle
+
+ ti,system-power-controller:
+ type: boolean
+ deprecated: true
+ description: >
+ DEPRECATED. The standard 'system-power-controller'
+ property on the parent node should be used instead.
+
+ ti,use_poweroff:
+ type: boolean
+ deprecated: true
+ description: DEPRECATED, to be removed.
+
+ required:
+ - compatible
+
- if:
properties:
compatible:
@@ -107,14 +210,29 @@ allOf:
properties:
charger:
type: object
+
properties:
compatible:
const: ti,twl6030-charger
+
gpadc:
type: object
+
properties:
compatible:
const: ti,twl6030-gpadc
+
+ usb-comparator:
+ type: object
+ additionalProperties: true
+
+ properties:
+ compatible:
+ const: ti,twl6030-usb
+
+ required:
+ - compatible
+
- if:
properties:
compatible:
@@ -143,22 +261,37 @@ allOf:
properties:
charger:
type: object
+
properties:
compatible:
items:
- const: ti,twl6032-charger
- const: ti,twl6030-charger
+
gpadc:
type: object
+
properties:
compatible:
const: ti,twl6032-gpadc

+ usb-comparator:
+ type: object
+ additionalProperties: true
+
+ properties:
+ compatible:
+ const: ti,twl6030-usb
+
+ required:
+ - compatible
+
properties:
compatible:
- description:
- TWL4030 for integrated power-management/audio CODEC device used in OMAP3
- based boards
+ description: >
+ TWL4030 for integrated power-management/audio CODEC device used in
+ OMAP3 based boards.
+
TWL6030/32 for integrated power-management used in OMAP4 based boards
enum:
- ti,twl4030
@@ -181,28 +314,80 @@ properties:
"#clock-cells":
const: 1

+ clocks:
+ maxItems: 1
+
+ clock-names:
+ const: fck
+
charger:
type: object
additionalProperties: true
+
properties:
compatible: true
+
required:
- compatible

rtc:
type: object
additionalProperties: false
+
properties:
compatible:
const: ti,twl4030-rtc
interrupts:
maxItems: 1

+ pwm:
+ type: object
+ $ref: /schemas/pwm/pwm.yaml#
+ unevaluatedProperties: false
+ description:
+ PWM controllers (PWM1 and PWM2 on TWL4030, PWM0 and PWM1 on TWL6030/32).
+
+ properties:
+ compatible:
+ enum:
+ - ti,twl4030-pwm
+ - ti,twl6030-pwm
+
+ '#pwm-cells':
+ const: 2
+
+ required:
+ - compatible
+ - '#pwm-cells'
+
+ pwmled:
+ type: object
+ $ref: /schemas/pwm/pwm.yaml#
+ unevaluatedProperties: false
+ description: >
+ PWM controllers connected to LED terminals (PWMA and PWMB on TWL4030.
+
+ LED PWM on TWL6030/32, mainly used as charging indicator LED).
+
+ properties:
+ compatible:
+ enum:
+ - ti,twl4030-pwmled
+ - ti,twl6030-pwmled
+
+ '#pwm-cells':
+ const: 2
+
+ required:
+ - compatible
+ - '#pwm-cells'
+
patternProperties:
"^regulator-":
type: object
unevaluatedProperties: false
$ref: /schemas/regulator/regulator.yaml
+
properties:
compatible: true
regulator-initial-mode:
@@ -211,12 +396,13 @@ patternProperties:
# with low power consumption with low load current capability
- 0x0e # Active mode, the regulator can deliver its nominal output
# voltage with full-load current capability
+
ti,retain-on-reset:
- description:
- Does not turn off the supplies during warm
- reset. Could be needed for VMMC, as TWL6030
- reset sequence for this signal does not comply
- with the SD specification.
+ description: >
+ Does not turn off the supplies during warm reset.
+
+ Could be needed for VMMC, as TWL6030 reset sequence for
+ this signal does not comply with the SD specification.
type: boolean

unevaluatedProperties: false
@@ -271,6 +457,16 @@ examples:
compatible = "ti,twl6030-vmmc";
ti,retain-on-reset;
};
+
+ pwm {
+ compatible = "ti,twl6030-pwm";
+ #pwm-cells = <2>;
+ };
+
+ pwmled {
+ compatible = "ti,twl6030-pwmled";
+ #pwm-cells = <2>;
+ };
};
};

@@ -325,6 +521,20 @@ examples:
watchdog {
compatible = "ti,twl4030-wdt";
};
+
+ power {
+ compatible = "ti,twl4030-power";
+ };
+
+ pwm {
+ compatible = "ti,twl4030-pwm";
+ #pwm-cells = <2>;
+ };
+
+ pwmled {
+ compatible = "ti,twl4030-pwmled";
+ #pwm-cells = <2>;
+ };
};
};
...
diff --git a/Documentation/devicetree/bindings/mfd/twl4030-power.txt b/Documentation/devicetree/bindings/mfd/twl4030-power.txt
deleted file mode 100644
index 3d19963312ce..000000000000
--- a/Documentation/devicetree/bindings/mfd/twl4030-power.txt
+++ /dev/null
@@ -1,48 +0,0 @@
-Texas Instruments TWL family (twl4030) reset and power management module
-
-The power management module inside the TWL family provides several facilities
-to control the power resources, including power scripts. For now, the
-binding only supports the complete shutdown of the system after poweroff.
-
-Required properties:
-- compatible : must be one of the following
- "ti,twl4030-power"
- "ti,twl4030-power-reset"
- "ti,twl4030-power-idle"
- "ti,twl4030-power-idle-osc-off"
-
-The use of ti,twl4030-power-reset is recommended at least on
-3530 that needs a special configuration for warm reset to work.
-
-When using ti,twl4030-power-idle, the TI recommended configuration
-for idle modes is loaded to the tlw4030 PMIC.
-
-When using ti,twl4030-power-idle-osc-off, the TI recommended
-configuration is used with the external oscillator being shut
-down during off-idle. Note that this does not work on all boards
-depending on how the external oscillator is wired.
-
-Optional properties:
-
-- ti,system-power-controller: This indicates that TWL4030 is the
- power supply master of the system. With this flag, the chip will
- initiate an ACTIVE-to-OFF or SLEEP-to-OFF transition when the
- system poweroffs.
-
-- ti,use_poweroff: Deprecated name for ti,system-power-controller
-
-Example:
-&i2c1 {
- clock-frequency = <2600000>;
-
- twl: twl@48 {
- reg = <0x48>;
- interrupts = <7>; /* SYS_NIRQ cascaded to intc */
- interrupt-parent = <&intc>;
-
- twl_power: power {
- compatible = "ti,twl4030-power";
- ti,use_poweroff;
- };
- };
-};
diff --git a/Documentation/devicetree/bindings/pwm/ti,twl-pwm.txt b/Documentation/devicetree/bindings/pwm/ti,twl-pwm.txt
deleted file mode 100644
index d97ca1964e94..000000000000
--- a/Documentation/devicetree/bindings/pwm/ti,twl-pwm.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-Texas Instruments TWL series PWM drivers
-
-Supported PWMs:
-On TWL4030 series: PWM1 and PWM2
-On TWL6030 series: PWM0 and PWM1
-
-Required properties:
-- compatible: "ti,twl4030-pwm" or "ti,twl6030-pwm"
-- #pwm-cells: should be 2. See pwm.yaml in this directory for a description of
- the cells format.
-
-Example:
-
-twl_pwm: pwm {
- compatible = "ti,twl6030-pwm";
- #pwm-cells = <2>;
-};
diff --git a/Documentation/devicetree/bindings/pwm/ti,twl-pwmled.txt b/Documentation/devicetree/bindings/pwm/ti,twl-pwmled.txt
deleted file mode 100644
index 31ca1b032ef0..000000000000
--- a/Documentation/devicetree/bindings/pwm/ti,twl-pwmled.txt
+++ /dev/null
@@ -1,17 +0,0 @@
-Texas Instruments TWL series PWM drivers connected to LED terminals
-
-Supported PWMs:
-On TWL4030 series: PWMA and PWMB (connected to LEDA and LEDB terminals)
-On TWL6030 series: LED PWM (mainly used as charging indicator LED)
-
-Required properties:
-- compatible: "ti,twl4030-pwmled" or "ti,twl6030-pwmled"
-- #pwm-cells: should be 2. See pwm.yaml in this directory for a description of
- the cells format.
-
-Example:
-
-twl_pwmled: pwmled {
- compatible = "ti,twl6030-pwmled";
- #pwm-cells = <2>;
-};
--
2.39.5