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