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Message-Id: <20251002-ti-leds-to-dt-v1-1-1604ae333479@thegoodpenguin.co.uk>
Date: Thu, 02 Oct 2025 10:20:15 +0100
From: Harrison Carter <hcarter@...goodpenguin.co.uk>
To: Lee Jones <lee@...nel.org>, Pavel Machek <pavel@...nel.org>,
Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Dan Murphy <dmurphy@...com>
Cc: linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org,
Harrison Carter <hcarter@...goodpenguin.co.uk>
Subject: [PATCH 1/2] dt-bindings: leds: ti,lm3532: Convert to DT Schema
Converts the ti,lm3532 to DT Schema format
Signed-off-by: Harrison Carter <hcarter@...goodpenguin.co.uk>
---
.../devicetree/bindings/leds/leds-lm3532.txt | 105 -------------
.../devicetree/bindings/leds/ti,lm3532.yaml | 172 +++++++++++++++++++++
2 files changed, 172 insertions(+), 105 deletions(-)
diff --git a/Documentation/devicetree/bindings/leds/leds-lm3532.txt b/Documentation/devicetree/bindings/leds/leds-lm3532.txt
deleted file mode 100644
index 097490a5ff91206ce8c8f0fe0a093a043f089416..0000000000000000000000000000000000000000
--- a/Documentation/devicetree/bindings/leds/leds-lm3532.txt
+++ /dev/null
@@ -1,105 +0,0 @@
-* Texas Instruments - lm3532 White LED driver with ambient light sensing
-capability.
-
-The LM3532 provides the 3 high-voltage, low-side current sinks. The device is
-programmable over an I2C-compatible interface and has independent
-current control for all three channels. The adaptive current regulation
-method allows for different LED currents in each current sink thus allowing
-for a wide variety of backlight and keypad applications.
-
-The main features of the LM3532 include dual ambient light sensor inputs
-each with 32 internal voltage setting resistors, 8-bit logarithmic and linear
-brightness control, dual external PWM brightness control inputs, and up to
-1000:1 dimming ratio with programmable fade in and fade out settings.
-
-Required properties:
- - compatible : "ti,lm3532"
- - reg : I2C slave address
- - #address-cells : 1
- - #size-cells : 0
-
-Optional properties:
- - enable-gpios : gpio pin to enable (active high)/disable the device.
- - ramp-up-us - The Run time ramp rates/step are from one current
- set-point to another after the device has reached its
- initial target set point from turn-on
- - ramp-down-us - The Run time ramp rates/step are from one current
- set-point to another after the device has reached its
- initial target set point from turn-on
- Range for ramp settings: 8us - 65536us
-
-Optional properties if ALS mode is used:
- - ti,als-vmin - Minimum ALS voltage defined in Volts
- - ti,als-vmax - Maximum ALS voltage defined in Volts
- Per the data sheet the max ALS voltage is 2V and the min is 0V
-
- - ti,als1-imp-sel - ALS1 impedance resistor selection in Ohms
- - ti,als2-imp-sel - ALS2 impedance resistor selection in Ohms
- Range for impedance select: 37000 Ohms - 1190 Ohms
- Values above 37kohms will be set to the "High Impedance" setting
-
- - ti,als-avrg-time-us - Determines the length of time the device needs to
- average the two ALS inputs. This is only used if
- the input mode is LM3532_ALS_INPUT_AVRG.
- Range: 17920us - 2293760us
- - ti,als-input-mode - Determines how the device uses the attached ALS
- devices.
- 0x00 - ALS1 and ALS2 input average
- 0x01 - ALS1 Input
- 0x02 - ALS2 Input
- 0x03 - Max of ALS1 and ALS2
-
-Required child properties:
- - reg : Indicates control bank the LED string is controlled by
- - led-sources : see Documentation/devicetree/bindings/leds/common.txt
- - ti,led-mode : Defines if the LED strings are manually controlled or
- if the LED strings are controlled by the ALS.
- 0x00 - LED strings are I2C controlled via full scale
- brightness control register
- 0x01 - LED strings are ALS controlled
-
-Optional LED child properties:
- - label : see Documentation/devicetree/bindings/leds/common.txt
- - linux,default-trigger :
- see Documentation/devicetree/bindings/leds/common.txt
- - led-max-microamp : Defines the full scale current value for each control
- bank. The range is from 5000uA-29800uA in increments
- of 800uA.
-
-Example:
-led-controller@38 {
- compatible = "ti,lm3532";
- #address-cells = <1>;
- #size-cells = <0>;
- reg = <0x38>;
-
- enable-gpios = <&gpio6 12 GPIO_ACTIVE_HIGH>;
- ramp-up-us = <1024>;
- ramp-down-us = <65536>;
-
- ti,als-vmin = <0>;
- ti,als-vmax = <2000>;
- ti,als1-imp-sel = <4110>;
- ti,als2-imp-sel = <2180>;
- ti,als-avrg-time-us = <17920>;
- ti,als-input-mode = <0x00>;
-
- led@0 {
- reg = <0>;
- led-sources = <2>;
- ti,led-mode = <1>;
- led-max-microamp = <21800>;
- label = ":backlight";
- linux,default-trigger = "backlight";
- };
-
- led@1 {
- reg = <1>;
- led-sources = <1>;
- ti,led-mode = <0>;
- label = ":kbd_backlight";
- };
-};
-
-For more product information please see the links below:
-https://www.ti.com/product/LM3532
diff --git a/Documentation/devicetree/bindings/leds/ti,lm3532.yaml b/Documentation/devicetree/bindings/leds/ti,lm3532.yaml
new file mode 100644
index 0000000000000000000000000000000000000000..425277e519bd6de9822822685e9f101d0b3ef40a
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/ti,lm3532.yaml
@@ -0,0 +1,172 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/ti,lm3532.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Texas Instruments - lm3532 White LED driver with
+ ambient light sensing capability.
+
+description: |
+ The LM3532 provides the 3 high-voltage,
+ low-side current sinks. The device is programmable over an
+ I2C-compatible interface and has independent current
+ control for all three channels. The adaptive current
+ regulation method allows for different LED currents in
+ each current sink thus allowing for a wide variety of
+ backlight and keypad applications.
+
+ The main features of the LM3532 include dual ambient light
+ sensor inputs each with 32 internal voltage setting
+ resistors, 8-bit logarithmic and linear brightness
+ control, dual external PWM brightness control inputs,
+ and up to 1000:1 dimming ratio with programmable fade in
+ and fade out settings.
+
+ For more product information please see the link below:
+ https://www.ti.com/product/LM3532
+
+maintainers:
+ - Dan Murphy <dmurphy@...com>
+
+properties:
+ compatible:
+ const: ti,lm3532
+
+ reg:
+ maxItems: 1
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+ enable-gpios:
+ description: GPIO pin to enable (active high)/disable
+ the device.
+ maxItems: 1
+
+ ti,als-avrg-time-us:
+ description: Determines the length of time the device
+ needs to average the two ALS inputs. This is only
+ used if the input mode is LM3532_ALS_INPUT_AVRG.
+ minimum: 17920
+ maximum: 2293760
+
+ ti,als-input-mode:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: Determines how the device uses the attached
+ ALS devices.
+ 0x00 - ALS1 and ALS2 input average
+ 0x01 - ALS1 Input
+ 0x02 - ALS2 Input
+ 0x03 - Max of ALS1 and ALS2
+ minimum: 0
+ maximum: 3
+
+patternProperties:
+ "^ramp-(up|down)-us$":
+ description: The Run time ramp rates/step are from one
+ current set-point to another after the device has
+ reached its initial target set point from turn-on
+ minimum: 8
+ maximum: 65536
+
+ "^ti,als-v(min|max)$":
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: Min/max ALS voltage in Volts.
+ minimum: 0
+ maximum: 2
+
+ "^ti,als(1|2)-imp-sel$":
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: ALS impedance resistor selection in Ohms.
+ Values above 37kohms will be set to the "High
+ Impedance" setting
+ minimum: 1190
+ maximum: 37000
+
+ "^led@[0,1]?([0-9]|[a-z])$":
+ $ref: common.yaml#
+ type: object
+ properties:
+ reg:
+ description: Indicates control bank the LED string
+ is controlled by
+
+ ti,led-mode:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: Defines if the LED strings are manually
+ controlled or if the LED strings are controlled
+ by the ALS.
+ 0x00 - LED strings are I2C controlled via full
+ scale brightness control register
+ 0x01 - LED strings are ALS controlled
+ minimum: 0
+ maximum: 1
+
+ led-max-microamp:
+ minimum: 5000
+ maximum: 29800
+ multipleOf: 800
+
+ required:
+ - reg
+ - led-sources
+ - ti,led-mode
+
+ unevaluatedProperties: true
+
+required:
+ - compatible
+ - reg
+ - '#address-cells'
+ - '#size-cells'
+
+additionalProperties: false
+
+examples:
+ - |
+ #include <dt-bindings/gpio/gpio.h>
+ #include <dt-bindings/leds/common.h>
+
+ i2c {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ led-controller@38 {
+ compatible = "ti,lm3532";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x38>;
+
+ enable-gpios = <&gpio6 12 GPIO_ACTIVE_HIGH>;
+ ramp-up-us = <1024>;
+ ramp-down-us = <65536>;
+
+ ti,als-vmin = <0>;
+ ti,als-vmax = <2>;
+ ti,als1-imp-sel = <4110>;
+ ti,als2-imp-sel = <2180>;
+ ti,als-avrg-time-us = <17920>;
+ ti,als-input-mode = <0x00>;
+
+ led@0 {
+ reg = <0>;
+ led-sources = <2>;
+ ti,led-mode = <1>;
+ led-max-microamp = <21600>;
+ label = ":backlight";
+ linux,default-trigger = "backlight";
+ };
+
+ led@1 {
+ reg = <1>;
+ led-sources = <1>;
+ ti,led-mode = <0>;
+ label = ":kbd_backlight";
+ };
+ };
+ };
+...
--
2.51.0
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