| GPIO controlled regulators |
| |
| Required properties: |
| - compatible : Must be "regulator-gpio". |
| - regulator-name : Defined in regulator.txt as optional, but required |
| here. |
| - gpios : Array of one or more GPIO pins used to select the |
| regulator voltage/current listed in "states". |
| - states : Selection of available voltages/currents provided by |
| this regulator and matching GPIO configurations to |
| achieve them. If there are no states in the "states" |
| array, use a fixed regulator instead. |
| |
| Optional properties: |
| - enable-gpios : GPIO used to enable/disable the regulator. |
| Warning, the GPIO phandle flags are ignored and the |
| GPIO polarity is controlled solely by the presence |
| of "enable-active-high" DT property. This is due to |
| compatibility with old DTs. |
| - enable-active-high : Polarity of "enable-gpio" GPIO is active HIGH. |
| Default is active LOW. |
| - gpios-states : On operating systems, that don't support reading back |
| gpio values in output mode (most notably linux), this |
| array provides the state of GPIO pins set when |
| requesting them from the gpio controller. Systems, |
| that are capable of preserving state when requesting |
| the lines, are free to ignore this property. |
| 0: LOW, 1: HIGH. Default is LOW if nothing else |
| is specified. |
| - startup-delay-us : Startup time in microseconds. |
| - regulator-type : Specifies what is being regulated, must be either |
| "voltage" or "current", defaults to voltage. |
| |
| Any property defined as part of the core regulator binding defined in |
| regulator.txt can also be used. |
| |
| Example: |
| |
| mmciv: gpio-regulator { |
| compatible = "regulator-gpio"; |
| |
| regulator-name = "mmci-gpio-supply"; |
| regulator-min-microvolt = <1800000>; |
| regulator-max-microvolt = <2600000>; |
| regulator-boot-on; |
| |
| enable-gpios = <&gpio0 23 0x4>; |
| gpios = <&gpio0 24 0x4 |
| &gpio0 25 0x4>; |
| states = <1800000 0x3 |
| 2200000 0x2 |
| 2600000 0x1 |
| 2900000 0x0>; |
| |
| startup-delay-us = <100000>; |
| enable-active-high; |
| }; |