as3711.txt

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    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 };

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