qcom-wled.yaml

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    1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
    2 %YAML 1.2
    3 ---
    4 $id: http://devicetree.org/schemas/leds/backlight/qcom-wled.yaml#
    5 $schema: http://devicetree.org/meta-schemas/core.yaml#
    6 
    7 title: Binding for Qualcomm Technologies, Inc. WLED driver
    8 
    9 maintainers:
   10   - Bjorn Andersson <bjorn.andersson@linaro.org>
   11   - Kiran Gunda <kgunda@codeaurora.org>
   12 
   13 description: |
   14   WLED (White Light Emitting Diode) driver is used for controlling display
   15   backlight that is part of PMIC on Qualcomm Technologies, Inc. reference
   16   platforms. The PMIC is connected to the host processor via SPMI bus.
   17 
   18 properties:
   19   compatible:
   20     enum:
   21       - qcom,pm8941-wled
   22       - qcom,pmi8994-wled
   23       - qcom,pmi8998-wled
   24       - qcom,pm660l-wled
   25       - qcom,pm6150l-wled
   26       - qcom,pm8150l-wled
   27 
   28   reg:
   29     maxItems: 1
   30 
   31   default-brightness:
   32     description: |
   33       brightness value on boot.
   34 
   35   label: true
   36 
   37   max-brightness:
   38     description: |
   39       Maximum brightness level.
   40 
   41   qcom,cs-out:
   42     description: |
   43       enable current sink output.
   44       This property is supported only for WLED3.
   45     type: boolean
   46 
   47   qcom,cabc:
   48     description: |
   49       enable content adaptive backlight control.
   50     type: boolean
   51 
   52   qcom,ext-gen:
   53     description: |
   54       use externally generated modulator signal to dim.
   55       This property is supported only for WLED3.
   56     type: boolean
   57 
   58   qcom,current-limit:
   59     description: |
   60       mA; per-string current limit.
   61       This property is supported only for WLED3.
   62     $ref: /schemas/types.yaml#/definitions/uint32
   63     default: 20
   64     minimum: 0
   65     maximum: 25
   66 
   67   qcom,current-limit-microamp:
   68     description: |
   69       uA; per-string current limit.
   70     default: 25
   71     minimum: 0
   72     maximum: 30000
   73     multipleOf: 25
   74 
   75   qcom,current-boost-limit:
   76     description: |
   77       mA; boost current limit.
   78     $ref: /schemas/types.yaml#/definitions/uint32
   79 
   80   qcom,switching-freq:
   81     description: |
   82       kHz; switching frequency.
   83     $ref: /schemas/types.yaml#/definitions/uint32
   84     enum: [ 600, 640, 685, 738, 800, 872, 960, 1066, 1200, 1371, 1600, 1920,
   85             2400, 3200, 4800, 9600 ]
   86 
   87   qcom,ovp:
   88     description: |
   89       V; Over-voltage protection limit.
   90       This property is supported only for WLED3.
   91     $ref: /schemas/types.yaml#/definitions/uint32
   92     enum: [ 27, 29, 32, 35 ]
   93     default: 29
   94 
   95   qcom,ovp-millivolt:
   96     description: |
   97       Over-voltage protection limit. This property is for WLED4 only.
   98     $ref: /schemas/types.yaml#/definitions/uint32
   99     enum: [ 18100, 19600, 29600, 31100 ]
  100     default: 29600
  101 
  102   qcom,num-strings:
  103     description: |
  104       number of led strings attached.
  105     $ref: /schemas/types.yaml#/definitions/uint32
  106 
  107   qcom,enabled-strings:
  108     description: |
  109       Array of the WLED strings numbered from 0 to 3. Each
  110       string of leds are operated individually. Specify the
  111       list of strings used by the device. Any combination of
  112       led strings can be used.
  113     $ref: /schemas/types.yaml#/definitions/uint32-array
  114     minItems: 1
  115     maxItems: 4
  116 
  117   qcom,external-pfet:
  118     description: |
  119       Specify if external PFET control for short circuit
  120       protection is used. This property is supported only
  121       for WLED4.
  122     type: boolean
  123 
  124   qcom,auto-string-detection:
  125     description: |
  126       Enables auto-detection of the WLED string configuration.
  127       This feature is not supported for WLED3.
  128     type: boolean
  129 
  130   interrupts:
  131     minItems: 1
  132     items:
  133       - description: over voltage protection interrupt.
  134       - description: short circuit interrupt.
  135 
  136   interrupt-names:
  137     minItems: 1
  138     items:
  139       - const: ovp
  140       - const: short
  141 
  142   qcom,modulator-sel:
  143     description: |
  144       Selects the modulator used for brightness modulation.
  145       Allowed values are,
  146            0 - Modulator A
  147            1 - Modulator B
  148       This property is applicable only to WLED5 peripheral.
  149     $ref: /schemas/types.yaml#/definitions/uint32
  150     enum: [ 0, 1 ]
  151     default: 0
  152 
  153   qcom,cabc-sel:
  154     description: |
  155       Selects the CABC pin signal used for brightness modulation.
  156       Allowed values are,
  157            0 - CABC disabled
  158            1 - CABC 1
  159            2 - CABC 2
  160            3 - External signal (e.g. LPG) is used for dimming
  161       This property is applicable only to WLED5 peripheral.
  162     $ref: /schemas/types.yaml#/definitions/uint32
  163     enum: [ 0, 1, 2, 3 ]
  164 
  165 allOf:
  166   - if:
  167       properties:
  168         compatible:
  169           contains:
  170             const: qcom,pm8941-wled
  171 
  172     then:
  173       properties:
  174         qcom,current-boost-limit:
  175           enum: [ 105, 385, 525, 805, 980, 1260, 1400, 1680 ]
  176           default: 805
  177 
  178         qcom,switching-freq:
  179           default: 1600
  180 
  181         qcom,num-strings:
  182           enum: [ 1, 2, 3 ]
  183 
  184         interrupts:
  185           maxItems: 1
  186 
  187         interrupt-names:
  188           maxItems: 1
  189 
  190     else:
  191       properties:
  192         qcom,current-boost-limit:
  193           enum: [ 105, 280, 450, 620, 970, 1150, 1300, 1500 ]
  194           default: 970
  195 
  196         qcom,switching-freq:
  197           default: 800
  198 
  199         qcom,num-strings:
  200           enum: [ 1, 2, 3, 4 ]
  201 
  202         interrupts:
  203           minItems: 2
  204 
  205         interrupt-names:
  206           minItems: 2
  207   - if:
  208       properties:
  209         compatible:
  210           contains:
  211             enum:
  212               - qcom,pm8150l-wled
  213 
  214     then:
  215       properties:
  216         default-brightness:
  217           minimum: 0
  218           maximum: 32767
  219 
  220         max-brightness:
  221           minimum: 0
  222           maximum: 32767
  223 
  224     else:
  225       properties:
  226         default-brightness:
  227           minimum: 0
  228           maximum: 4095
  229 
  230         max-brightness:
  231           minimum: 0
  232           maximum: 4095
  233 
  234 required:
  235   - compatible
  236   - reg
  237   - label
  238 
  239 additionalProperties: false
  240 
  241 examples:
  242   - |
  243     backlight@d800 {
  244         compatible = "qcom,pm8941-wled";
  245         reg = <0xd800 0x100>;
  246         label = "backlight";
  247 
  248         qcom,cs-out;
  249         qcom,current-limit = <20>;
  250         qcom,current-boost-limit = <805>;
  251         qcom,switching-freq = <1600>;
  252         qcom,ovp = <29>;
  253         qcom,num-strings = <2>;
  254         qcom,enabled-strings = <0 1>;
  255      };

Cache object: e08fc6f2ec37f6126cea6491e0677248

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FreeBSD/Linux Kernel Cross Reference sys/contrib/device-tree/Bindings/leds/backlight/qcom-wled.yaml

FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/leds/backlight/qcom-wled.yaml