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-Binding for Qualcomm Technologies, Inc. WLED driver
-
-WLED (White Light Emitting Diode) driver is used for controlling display
-backlight that is part of PMIC on Qualcomm Technologies, Inc. reference
-platforms. The PMIC is connected to the host processor via SPMI bus.
-
-- compatible
- Usage: required
- Value type: <string>
- Definition: should be one of:
- "qcom,pm8941-wled"
- "qcom,pmi8998-wled"
- "qcom,pm660l-wled"
-
-- reg
- Usage: required
- Value type: <prop encoded array>
- Definition: Base address of the WLED modules.
-
-- default-brightness
- Usage: optional
- Value type: <u32>
- Definition: brightness value on boot, value from: 0-4095.
- Default: 2048
-
-- label
- Usage: required
- Value type: <string>
- Definition: The name of the backlight device
-
-- qcom,cs-out
- Usage: optional
- Value type: <bool>
- Definition: enable current sink output.
- This property is supported only for PM8941.
-
-- qcom,cabc
- Usage: optional
- Value type: <bool>
- Definition: enable content adaptive backlight control.
-
-- qcom,ext-gen
- Usage: optional
- Value type: <bool>
- Definition: use externally generated modulator signal to dim.
- This property is supported only for PM8941.
-
-- qcom,current-limit
- Usage: optional
- Value type: <u32>
- Definition: mA; per-string current limit; value from 0 to 25 with
- 1 mA step. Default 20 mA.
- This property is supported only for pm8941.
-
-- qcom,current-limit-microamp
- Usage: optional
- Value type: <u32>
- Definition: uA; per-string current limit; value from 0 to 30000 with
- 2500 uA step. Default 25 mA.
-
-- qcom,current-boost-limit
- Usage: optional
- Value type: <u32>
- Definition: mA; boost current limit.
- For pm8941: one of: 105, 385, 525, 805, 980, 1260, 1400,
- 1680. Default: 805 mA.
- For pmi8998: one of: 105, 280, 450, 620, 970, 1150, 1300,
- 1500. Default: 970 mA.
-
-- qcom,switching-freq
- Usage: optional
- Value type: <u32>
- Definition: kHz; switching frequency; one of: 600, 640, 685, 738,
- 800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200,
- 4800, 9600.
- Default: for pm8941: 1600 kHz
- for pmi8998: 800 kHz
-
-- qcom,ovp
- Usage: optional
- Value type: <u32>
- Definition: V; Over-voltage protection limit; one of:
- 27, 29, 32, 35. Default: 29V
- This property is supported only for PM8941.
-
-- qcom,ovp-millivolt
- Usage: optional
- Value type: <u32>
- Definition: mV; Over-voltage protection limit;
- For pmi8998: one of 18100, 19600, 29600, 31100.
- Default 29600 mV.
- If this property is not specified for PM8941, it
- falls back to "qcom,ovp" property.
-
-- qcom,num-strings
- Usage: optional
- Value type: <u32>
- Definition: #; number of led strings attached;
- value: For PM8941 from 1 to 3. Default: 2
- For PMI8998 from 1 to 4.
-
-- interrupts
- Usage: optional
- Value type: <prop encoded array>
- Definition: Interrupts associated with WLED. This should be
- "short" and "ovp" interrupts. Interrupts can be
- specified as per the encoding listed under
- Documentation/devicetree/bindings/spmi/
- qcom,spmi-pmic-arb.txt.
-
-- interrupt-names
- Usage: optional
- Value type: <string>
- Definition: Interrupt names associated with the interrupts.
- Must be "short" and "ovp". The short circuit detection
- is not supported for PM8941.
-
-- qcom,enabled-strings
- Usage: optional
- Value tyoe: <u32 array>
- Definition: Array of the WLED strings numbered from 0 to 3. Each
- string of leds are operated individually. Specify the
- list of strings used by the device. Any combination of
- led strings can be used.
-
-- qcom,external-pfet
- Usage: optional
- Value type: <bool>
- Definition: Specify if external PFET control for short circuit
- protection is used. This property is supported only
- for PMI8998.
-
-- qcom,auto-string-detection
- Usage: optional
- Value type: <bool>
- Definition: Enables auto-detection of the WLED string configuration.
- This feature is not supported for PM8941.
-
-
-Example:
-
-pm8941-wled@d800 {
- compatible = "qcom,pm8941-wled";
- reg = <0xd800>;
- label = "backlight";
-
- qcom,cs-out;
- qcom,current-limit = <20>;
- qcom,current-boost-limit = <805>;
- qcom,switching-freq = <1600>;
- qcom,ovp = <29>;
- qcom,num-strings = <2>;
- qcom,enabled-strings = <0 1>;
-};
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+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/backlight/qcom-wled.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Binding for Qualcomm Technologies, Inc. WLED driver
+
+maintainers:
+ - Lee Jones <lee.jones@linaro.org>
+
+description: |
+ WLED (White Light Emitting Diode) driver is used for controlling display
+ backlight that is part of PMIC on Qualcomm Technologies, Inc. reference
+ platforms. The PMIC is connected to the host processor via SPMI bus.
+
+properties:
+ compatible :
+ enum:
+ - qcom,pm8941-wled
+ - qcom,pmi8998-wled
+ - qcom,pm660l-wled
+
+ reg:
+ maxItems: 1
+
+ default-brightness:
+ maxItems: 1
+ description:
+ brightness value on boot, value from 0-4095.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ default: 2048
+
+ label:
+ maxItems: 1
+ description:
+ The name of the backlight device.
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/string
+
+ qcom,cs-out:
+ description:
+ enable current sink output.
+ This property is supported only for PM8941.
+ type: boolean
+
+ qcom,cabc:
+ description:
+ enable content adaptive backlight control.
+ type: boolean
+
+ qcom,ext-gen:
+ description:
+ use externally generated modulator signal to dim.
+ This property is supported only for PM8941.
+ type: boolean
+
+ qcom,current-limit:
+ maxItems: 1
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ mA; per-string current limit; value from 0 to 25 with
+ 1 mA step. This property is supported only for pm8941.
+ default: 20
+
+ qcom,current-limit-microamp:
+ maxItems: 1
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ uA; per-string current limit; value from 0 to 30000 with
+ 2500 uA step.
+ default: 25
+
+ qcom,current-boost-limit:
+ maxItems: 1
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ mA; boost current limit.
+ For pm8941 one of 105, 385, 525, 805, 980, 1260, 1400, 1680.
+ Default, 805 mA.
+ For pmi8998 one of 105, 280, 450, 620, 970, 1150, 1300,
+ 1500. Default 970 mA.
+
+ qcom,switching-freq:
+ maxItems: 1
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ kHz; switching frequency; one of 600, 640, 685, 738,
+ 800, 872, 960, 1066, 1200, 1371, 1600, 1920, 2400, 3200,
+ 4800, 9600.
+ Default for pm8941 1600 kHz
+ for pmi8998 800 kHz
+
+ qcom,ovp:
+ maxItems: 1
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ V; Over-voltage protection limit; one of 27, 29, 32, 35. Default 29V
+ This property is supported only for PM8941.
+
+ qcom,ovp-millivolt:
+ maxItems: 1
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ mV; Over-voltage protection limit;
+ For pmi8998 one of 18100, 19600, 29600, 31100.
+ Default 29600 mV.
+ If this property is not specified for PM8941, it
+ falls back to "qcom,ovp" property.
+
+ qcom,num-strings:
+ maxItems: 1
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32
+ description:
+ number of led strings attached;
+ value for PM8941 from 1 to 3. Default 2
+ For PMI8998 from 1 to 4.
+
+ interrupts:
+ maxItems: 2
+ description:
+ Interrupts associated with WLED. This should be
+ "short" and "ovp" interrupts. Interrupts can be
+ specified as per the encoding listed under
+ Documentation/devicetree/bindings/spmi/
+ qcom,spmi-pmic-arb.txt.
+
+ interrupt-names:
+ description:
+ Interrupt names associated with the interrupts.
+ Must be "short" and "ovp". The short circuit detection
+ is not supported for PM8941.
+
+ qcom,enabled-strings:
+ maxItems: 1
+ allOf:
+ - $ref: /schemas/types.yaml#/definitions/uint32-array
+ description:
+ Array of the WLED strings numbered from 0 to 3. Each
+ string of leds are operated individually. Specify the
+ list of strings used by the device. Any combination of
+ led strings can be used.
+
+ qcom,external-pfet:
+ description:
+ Specify if external PFET control for short circuit
+ protection is used. This property is supported only
+ for PMI8998.
+ type: boolean
+
+ qcom,auto-string-detection:
+ description:
+ Enables auto-detection of the WLED string configuration.
+ This feature is not supported for PM8941.
+ type: boolean
+
+required:
+ - compatible
+ - reg
+ - label
+
+examples:
+ - |
+ pm8941-wled@d800 {
+ compatible = "qcom,pm8941-wled";
+ reg = <0xd800 0x100>;
+ label = "backlight";
+
+ qcom,cs-out;
+ qcom,current-limit = <20>;
+ qcom,current-boost-limit = <805>;
+ qcom,switching-freq = <1600>;
+ qcom,ovp = <29>;
+ qcom,num-strings = <2>;
+ qcom,enabled-strings = <0 1>;
+ };