Documentation/devicetree/bindings/mfd/as3722.txt

   1 * ams AS3722 Power management IC.
   2
   3 Required properties:
   4 -------------------
   5 - compatible: Must be "ams,as3722".
   6 - reg: I2C device address.
   7 - interrupt-controller: AS3722 has internal interrupt controller which takes the
   8   interrupt request from internal sub-blocks like RTC, regulators, GPIOs as well
   9   as external input.
  10 - #interrupt-cells: Should be set to 2 for IRQ number and flags.
  11   The first cell is the IRQ number. IRQ numbers for different interrupt source
  12   of AS3722 are defined at dt-bindings/mfd/as3722.h
  13   The second cell is the flags, encoded as the trigger masks from binding document
  14         interrupts.txt, using dt-bindings/irq.
  15
  16 Optional properties:
  17 --------------------
  18 - ams,enable-internal-int-pullup: Boolean property, to enable internal pullup on
  19         interrupt pin. Missing this will disable internal pullup on INT pin.
  20 - ams,enable-internal-i2c-pullup: Boolean property, to enable internal pullup on
  21         i2c scl/sda pins. Missing this will disable internal pullup on i2c
  22         scl/sda lines.
  23 - ams,enable-ac-ok-power-on: Boolean property, to enable exit out of power off
  24         mode with AC_OK pin (pin enabled in power off mode).
  25
  26 Optional submodule and their properties:
  27 =======================================
  28
  29 Pinmux and GPIO:
  30 ===============
  31 Device has 8 GPIO pins which can be configured as GPIO as well as the special IO
  32 functions.
  33
  34 Please refer to pinctrl-bindings.txt in this directory for details of the
  35 common pinctrl bindings used by client devices, including the meaning of the
  36 phrase "pin configuration node".
  37
  38 Following are properties which is needed if GPIO and pinmux functionality
  39 is required:
  40     Required properties:
  41     -------------------
  42         - gpio-controller: Marks the device node as a GPIO controller.
  43         - #gpio-cells: Number of GPIO cells. Refer to binding document
  44                         gpio/gpio.txt
  45
  46     Optional properties:
  47     --------------------
  48         Following properties are require if pin control setting is required
  49         at boot.
  50         - pinctrl-names: A pinctrl state named "default" be defined, using the
  51                 bindings in pinctrl/pinctrl-bindings.txt.
  52         - pinctrl[0...n]: Properties to contain the phandle that refer to
  53                 different nodes of pin control settings. These nodes represents
  54                 the pin control setting of state 0 to state n. Each of these
  55                 nodes contains different subnodes to represents some desired
  56                 configuration for a list of pins. This configuration can
  57                 include the mux function to select on those pin(s), and
  58                 various pin configuration parameters, such as pull-up,
  59                 open drain.
  60
  61                 Each subnode have following properties:
  62                 Required properties:
  63                     - pins: List of pins. Valid values of pins properties are:
  64                                 gpio0, gpio1, gpio2, gpio3, gpio4, gpio5,
  65                                 gpio6, gpio7
  66
  67                 Optional properties:
  68                         function, bias-disable, bias-pull-up, bias-pull-down,
  69                         bias-high-impedance, drive-open-drain.
  70
  71                         Valid values for function properties are:
  72                                 gpio, interrupt-out, gpio-in-interrupt,
  73                                 vsup-vbat-low-undebounce-out,
  74                                 vsup-vbat-low-debounce-out,
  75                                 voltage-in-standby, oc-pg-sd0, oc-pg-sd6,
  76                                 powergood-out, pwm-in, pwm-out, clk32k-out,
  77                                 watchdog-in, soft-reset-in
  78
  79 Regulators:
  80 ===========
  81 Device has multiple DCDC and LDOs. The node "regulators" is require if regulator
  82 functionality is needed.
  83
  84 Following are properties of regulator subnode.
  85
  86     Optional properties:
  87     -------------------
  88         The input supply of regulators are the optional properties on the
  89         regulator node. The input supply of these regulators are provided
  90         through following properties:
  91                 vsup-sd2-supply: Input supply for SD2.
  92                 vsup-sd3-supply: Input supply for SD3.
  93                 vsup-sd4-supply: Input supply for SD4.
  94                 vsup-sd5-supply: Input supply for SD5.
  95                 vin-ldo0-supply: Input supply for LDO0.
  96                 vin-ldo1-6-supply: Input supply for LDO1 and LDO6.
  97                 vin-ldo2-5-7-supply: Input supply for LDO2, LDO5 and LDO7.
  98                 vin-ldo3-4-supply: Input supply for LDO3 and LDO4.
  99                 vin-ldo9-10-supply: Input supply for LDO9 and LDO10.
 100                 vin-ldo11-supply: Input supply for LDO11.
 101
 102     Optional sub nodes for regulators:
 103     ---------------------------------
 104         The subnodes name is the name of regulator and it must be one of:
 105         sd[0-6], ldo[0-7], ldo[9-11]
 106
 107         Each sub-node should contain the constraints and initialization
 108         information for that regulator. See regulator.txt for a description
 109         of standard properties for these sub-nodes.
 110         Additional optional custom properties  are listed below.
 111                 ams,ext-control: External control of the rail. The option of
 112                         this properties will tell which external input is
 113                         controlling this rail. Valid values are 0, 1, 2 ad 3.
 114                         0: There is no external control of this rail.
 115                         1: Rail is controlled by ENABLE1 input pin.
 116                         2: Rail is controlled by ENABLE2 input pin.
 117                         3: Rail is controlled by ENABLE3 input pin.
 118                         Missing this property on DT will be assume as no
 119                         external control. The external control pin macros
 120                         are defined @dt-bindings/mfd/as3722.h
 121
 122                 ams,enable-tracking: Enable tracking with SD1, only supported
 123                         by LDO3.
 124
 125 Power-off:
 126 =========
 127 AS3722 supports the system power off by turning off all its rails.
 128 The device node should have the following properties to enable this
 129 functionality
 130 ams,system-power-controller: Boolean, to enable the power off functionality
 131         through this device.
 132
 133 Example:
 134 --------
 135 #include <dt-bindings/mfd/as3722.h>
 136 ...
 137 ams3722 {
 138         compatible = "ams,as3722";
 139         reg = <0x48>;
 140
 141         ams,system-power-controller;
 142
 143         interrupt-parent = <&intc>;
 144         interrupt-controller;
 145         #interrupt-cells = <2>;
 146
 147         gpio-controller;
 148         #gpio-cells = <2>;
 149
 150         pinctrl-names = "default";
 151         pinctrl-0 = <&as3722_default>;
 152
 153         as3722_default: pinmux {
 154                         gpio0 {
 155                                 pins = "gpio0";
 156                                 function = "gpio";
 157                                 bias-pull-down;
 158                         };
 159
 160                         gpio1_2_4_7 {
 161                                 pins = "gpio1", "gpio2", "gpio4", "gpio7";
 162                                 function = "gpio";
 163                                 bias-pull-up;
 164                         };
 165
 166                         gpio5 {
 167                                 pins = "gpio5";
 168                                 function = "clk32k_out";
 169                         };
 170         }
 171
 172         regulators {
 173                         vsup-sd2-supply = <...>;
 174                         ...
 175
 176                         sd0 {
 177                                 regulator-name = "vdd_cpu";
 178                                 regulator-min-microvolt = <700000>;
 179                                 regulator-max-microvolt = <1400000>;
 180                                 regulator-always-on;
 181                                 ams,ext-control = <2>;
 182                         };
 183
 184                         sd1 {
 185                                 regulator-name = "vdd_core";
 186                                 regulator-min-microvolt = <700000>;
 187                                 regulator-max-microvolt = <1400000>;
 188                                 regulator-always-on;
 189                                 ams,ext-control = <1>;
 190                         };
 191
 192                         sd2 {
 193                                 regulator-name = "vddio_ddr";
 194                                 regulator-min-microvolt = <1350000>;
 195                                 regulator-max-microvolt = <1350000>;
 196                                 regulator-always-on;
 197                         };
 198
 199                         sd4 {
 200                                 regulator-name = "avdd-hdmi-pex";
 201                                 regulator-min-microvolt = <1050000>;
 202                                 regulator-max-microvolt = <1050000>;
 203                                 regulator-always-on;
 204                         };
 205
 206                         sd5 {
 207                                 regulator-name = "vdd-1v8";
 208                                 regulator-min-microvolt = <1800000>;
 209                                 regulator-max-microvolt = <1800000>;
 210                                 regulator-always-on;
 211                         };
 212                         ....
 213         };
 214 };