Documentation/devicetree/bindings/mfd/as3711.txt

   1 AS3711 is an I2C PMIC from Austria MicroSystems with multiple DCDC and LDO power
   2 supplies, a battery charger and an RTC. So far only bindings for the two stepup
   3 DCDC converters are defined. Other DCDC and LDO supplies are configured, using
   4 standard regulator properties, they must belong to a sub-node, called
   5 "regulators" and be called "sd1" to "sd4" and "ldo1" to "ldo8." Stepup converter
   6 configuration should be placed in a subnode, called "backlight."
   7
   8 Compulsory properties:
   9 - compatible            : must be "ams,as3711"
  10 - reg                   : specifies the I2C address
  11
  12 To use the SU1 converter as a backlight source the following two properties must
  13 be provided:
  14 - su1-dev               : framebuffer phandle
  15 - su1-max-uA            : maximum current
  16
  17 To use the SU2 converter as a backlight source the following two properties must
  18 be provided:
  19 - su2-dev               : framebuffer phandle
  20 - su1-max-uA            : maximum current
  21
  22 Additionally one of these properties must be provided to select the type of
  23 feedback used:
  24 - su2-feedback-voltage  : voltage feedback is used
  25 - su2-feedback-curr1    : CURR1 input used for current feedback
  26 - su2-feedback-curr2    : CURR2 input used for current feedback
  27 - su2-feedback-curr3    : CURR3 input used for current feedback
  28 - su2-feedback-curr-auto: automatic current feedback selection
  29
  30 and one of these to select the over-voltage protection pin
  31 - su2-fbprot-lx-sd4     : LX_SD4 is used for over-voltage protection
  32 - su2-fbprot-gpio2      : GPIO2 is used for over-voltage protection
  33 - su2-fbprot-gpio3      : GPIO3 is used for over-voltage protection
  34 - su2-fbprot-gpio4      : GPIO4 is used for over-voltage protection
  35
  36 If "su2-feedback-curr-auto" is selected, one or more of the following properties
  37 have to be specified:
  38 - su2-auto-curr1        : use CURR1 input for current feedback
  39 - su2-auto-curr2        : use CURR2 input for current feedback
  40 - su2-auto-curr3        : use CURR3 input for current feedback
  41
  42 Example:
  43
  44 as3711@40 {
  45         compatible = "ams,as3711";
  46         reg = <0x40>;
  47
  48         regulators {
  49                 sd4 {
  50                         regulator-name = "1.215V";
  51                         regulator-min-microvolt = <1215000>;
  52                         regulator-max-microvolt = <1235000>;
  53                 };
  54                 ldo2 {
  55                         regulator-name = "2.8V CPU";
  56                         regulator-min-microvolt = <2800000>;
  57                         regulator-max-microvolt = <2800000>;
  58                         regulator-always-on;
  59                         regulator-boot-on;
  60                 };
  61         };
  62
  63         backlight {
  64                 compatible = "ams,as3711-bl";
  65                 su2-dev = <&lcdc>;
  66                 su2-max-uA = <36000>;
  67                 su2-feedback-curr-auto;
  68                 su2-fbprot-gpio4;
  69                 su2-auto-curr1;
  70                 su2-auto-curr2;
  71                 su2-auto-curr3;
  72         };
  73 };