Documentation/devicetree/bindings/regulator/max8997-regulator.txt

   1 * Maxim MAX8997 Voltage and Current Regulator
   2
   3 The Maxim MAX8997 is a multi-function device which includes voltage and
   4 current regulators, rtc, charger controller and other sub-blocks. It is
   5 interfaced to the host controller using a i2c interface. Each sub-block is
   6 addressed by the host system using different i2c slave address. This document
   7 describes the bindings for 'pmic' sub-block of max8997.
   8
   9 Required properties:
  10 - compatible: Should be "maxim,max8997-pmic".
  11 - reg: Specifies the i2c slave address of the pmic block. It should be 0x66.
  12
  13 - max8997,pmic-buck1-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
  14   units for buck1 when changing voltage using gpio dvs. Refer to [1] below
  15   for additional information.
  16
  17 - max8997,pmic-buck2-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
  18   units for buck2 when changing voltage using gpio dvs. Refer to [1] below
  19   for additional information.
  20
  21 - max8997,pmic-buck5-dvs-voltage: A set of 8 voltage values in micro-volt (uV)
  22   units for buck5 when changing voltage using gpio dvs. Refer to [1] below
  23   for additional information.
  24
  25 [1] If none of the 'max8997,pmic-buck[1/2/5]-uses-gpio-dvs' optional
  26     property is specified, the 'max8997,pmic-buck[1/2/5]-dvs-voltage'
  27     property should specify atleast one voltage level (which would be a
  28     safe operating voltage).
  29
  30     If either of the 'max8997,pmic-buck[1/2/5]-uses-gpio-dvs' optional
  31     property is specified, then all the eight voltage values for the
  32     'max8997,pmic-buck[1/2/5]-dvs-voltage' should be specified.
  33
  34 Optional properties:
  35 - interrupt-parent: Specifies the phandle of the interrupt controller to which
  36   the interrupts from max8997 are delivered to.
  37 - interrupts: Interrupt specifiers for two interrupt sources.
  38   - First interrupt specifier is for 'irq1' interrupt.
  39   - Second interrupt specifier is for 'alert' interrupt.
  40 - max8997,pmic-buck1-uses-gpio-dvs: 'buck1' can be controlled by gpio dvs.
  41 - max8997,pmic-buck2-uses-gpio-dvs: 'buck2' can be controlled by gpio dvs.
  42 - max8997,pmic-buck5-uses-gpio-dvs: 'buck5' can be controlled by gpio dvs.
  43
  44 Additional properties required if either of the optional properties are used:
  45 - max8997,pmic-ignore-gpiodvs-side-effect: When GPIO-DVS mode is used for
  46   multiple bucks, changing the voltage value of one of the bucks may affect
  47   that of another buck, which is the side effect of the change (set_voltage).
  48   Use this property to ignore such side effects and change the voltage.
  49
  50 - max8997,pmic-buck125-default-dvs-idx: Default voltage setting selected from
  51   the possible 8 options selectable by the dvs gpios. The value of this
  52   property should be between 0 and 7. If not specified or if out of range, the
  53   default value of this property is set to 0.
  54
  55 - max8997,pmic-buck125-dvs-gpios: GPIO specifiers for three host gpio's used
  56   for dvs. The format of the gpio specifier depends in the gpio controller.
  57
  58 Regulators: The regulators of max8997 that have to be instantiated should be
  59 included in a sub-node named 'regulators'. Regulator nodes included in this
  60 sub-node should be of the format as listed below.
  61
  62         regulator_name {
  63                 standard regulator bindings here
  64         };
  65
  66 The following are the names of the regulators that the max8997 pmic block
  67 supports. Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number
  68 as per the datasheet of max8997.
  69
  70         - LDOn
  71                   - valid values for n are 1 to 18 and 21
  72                   - Example: LDO0, LD01, LDO2, LDO21
  73         - BUCKn
  74                   - valid values for n are 1 to 7.
  75                   - Example: BUCK1, BUCK2, BUCK3, BUCK7
  76
  77         - ENVICHG: Battery Charging Current Monitor Output. This is a fixed
  78                    voltage type regulator
  79
  80         - ESAFEOUT1: (ldo19)
  81         - ESAFEOUT2: (ld020)
  82
  83         - CHARGER_CV: main battery charger voltage control
  84         - CHARGER: main battery charger current control
  85         - CHARGER_TOPOFF: end of charge current threshold level
  86
  87 The bindings inside the regulator nodes use the standard regulator bindings
  88 which are documented elsewhere.
  89
  90 Example:
  91
  92         max8997_pmic@66 {
  93                 compatible = "maxim,max8997-pmic";
  94                 interrupt-parent = <&wakeup_eint>;
  95                 reg = <0x66>;
  96                 interrupts = <4 0>, <3 0>;
  97
  98                 max8997,pmic-buck1-uses-gpio-dvs;
  99                 max8997,pmic-buck2-uses-gpio-dvs;
 100                 max8997,pmic-buck5-uses-gpio-dvs;
 101
 102                 max8997,pmic-ignore-gpiodvs-side-effect;
 103                 max8997,pmic-buck125-default-dvs-idx = <0>;
 104
 105                 max8997,pmic-buck125-dvs-gpios = <&gpx0 0 1 0 0>, /* SET1 */
 106                                                  <&gpx0 1 1 0 0>, /* SET2 */
 107                                                  <&gpx0 2 1 0 0>; /* SET3 */
 108
 109                 max8997,pmic-buck1-dvs-voltage = <1350000>, <1300000>,
 110                                                  <1250000>, <1200000>,
 111                                                  <1150000>, <1100000>,
 112                                                  <1000000>, <950000>;
 113
 114                 max8997,pmic-buck2-dvs-voltage = <1100000>, <1100000>,
 115                                                  <1100000>, <1100000>,
 116                                                  <1000000>, <1000000>,
 117                                                  <1000000>, <1000000>;
 118
 119                 max8997,pmic-buck5-dvs-voltage = <1200000>, <1200000>,
 120                                                  <1200000>, <1200000>,
 121                                                  <1200000>, <1200000>,
 122                                                  <1200000>, <1200000>;
 123
 124                 regulators {
 125                         ldo1_reg: LDO1 {
 126                                 regulator-name = "VDD_ABB_3.3V";
 127                                 regulator-min-microvolt = <3300000>;
 128                                 regulator-max-microvolt = <3300000>;
 129                         };
 130
 131                         ldo2_reg: LDO2 {
 132                                 regulator-name = "VDD_ALIVE_1.1V";
 133                                 regulator-min-microvolt = <1100000>;
 134                                 regulator-max-microvolt = <1100000>;
 135                                 regulator-always-on;
 136                         };
 137
 138                         buck1_reg: BUCK1 {
 139                                 regulator-name = "VDD_ARM_1.2V";
 140                                 regulator-min-microvolt = <950000>;
 141                                 regulator-max-microvolt = <1350000>;
 142                                 regulator-always-on;
 143                                 regulator-boot-on;
 144                         };
 145                 };
 146         };