Documentation/devicetree/bindings/leds/leds-qcom-lpg.txt

   1 Binding for Qualcomm Light Pulse Generator
   2
   3 The Qualcomm Light Pulse Generator consists of three different hardware blocks;
   4 a ramp generator with lookup table, the light pulse generator and a three
   5 channel current sink. These blocks are found in a wide range of Qualcomm PMICs.
   6
   7 Required properties:
   8 - compatible: one of:
   9               "qcom,pm8916-pwm",
  10               "qcom,pm8941-lpg",
  11               "qcom,pm8994-lpg",
  12               "qcom,pmi8994-lpg",
  13               "qcom,pmi8998-lpg",
  14
  15 Optional properties:
  16 - qcom,power-source: power-source used to drive the output, as defined in the
  17                      datasheet. Should be specified if the TRILED block is
  18                      present
  19 - qcom,dtest: configures the output into an internal test line of the
  20               pmic. Specified by a list of u32 pairs, one pair per channel,
  21               where each pair denotes the test line to drive and the second
  22               configures how the value should be outputed, as defined in the
  23               datasheet
  24 - #pwm-cells: should be 2, see ../pwm/pwm.txt
  25
  26 LED subnodes:
  27 A set of subnodes can be used to specify LEDs connected to the LPG. Channels
  28 not associated with a LED are available as pwm channels, see ../pwm/pwm.txt.
  29
  30 Required properties:
  31 - led-sources: list of channels associated with this LED, starting at 1 for the
  32                first LPG channel
  33
  34 Optional properties:
  35 - label: see Documentation/devicetree/bindings/leds/common.txt
  36 - default-state: see Documentation/devicetree/bindings/leds/common.txt
  37 - linux,default-trigger: see Documentation/devicetree/bindings/leds/common.txt
  38
  39 Example:
  40 The following example defines a RGB LED attached to the PM8941.
  41
  42 &spmi_bus {
  43         pm8941@1 {
  44                 lpg {
  45                         compatible = "qcom,pm8941-lpg";
  46                         qcom,power-source = <1>;
  47
  48                         rgb {
  49                                 led-sources = <7 6 5>;
  50                         };
  51                 };
  52         };
  53 };
  54
  55 The following example defines the single PWM channel of the PM8916, which can
  56 be muxed by the MPP4 as a current sink.
  57
  58 &spmi_bus {
  59         pm8916@1 {
  60                 pm8916_pwm: pwm {
  61                         compatible = "qcom,pm8916-pwm";
  62
  63                         #pwm-cells = <2>;
  64                 };
  65         };
  66 };