projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 4ece7045 JMC |
1 | Binding for Maxim MAX77802 regulators |
| 2 | ||
| 3 | This is a part of device tree bindings of MAX77802 multi-function device. | |
| 4 | More information can be found in bindings/mfd/max77802.txt file. | |
| 5 | ||
| 6 | The MAX77802 PMIC has 10 high-efficiency Buck and 32 Low-dropout (LDO) | |
| 7 | regulators that can be controlled over I2C. | |
| 8 | ||
| 9 | Following properties should be present in main device node of the MFD chip. | |
| 10 | ||
| 11 | Optional node: | |
| 12 | - regulators : The regulators of max77802 have to be instantiated | |
| 13 | under subnode named "regulators" using the following format. | |
| 14 | ||
| 15 | regulator-name { | |
| 16 | standard regulator constraints.... | |
| 17 | }; | |
| 18 | refer Documentation/devicetree/bindings/regulator/regulator.txt | |
| 19 | ||
| 20 | The regulator node name should be initialized with a string to get matched | |
| 21 | with their hardware counterparts as follow. The valid names are: | |
| 22 | ||
| 23 | -LDOn : for LDOs, where n can lie in ranges 1-15, 17-21, 23-30 | |
| 24 | and 32-35. | |
| 25 | example: LDO1, LDO2, LDO35. | |
| 26 | -BUCKn : for BUCKs, where n can lie in range 1 to 10. | |
| 27 | example: BUCK1, BUCK5, BUCK10. | |
| bf66c48d JMC |
28 | |
| 29 | The max77802 regulator supports two different operating modes: Normal and Low | |
| 30 | Power Mode. Some regulators support the modes to be changed at startup or by | |
| 31 | the consumers during normal operation while others only support to change the | |
| 32 | mode during system suspend. The standard regulator suspend states binding can | |
| 33 | be used to configure the regulator operating mode. | |
| 34 | ||
| 35 | The regulators that support the standard "regulator-initial-mode" property, | |
| 36 | changing their mode during normal operation are: LDOs 1, 3, 20 and 21. | |
| 37 | ||
| 38 | The possible values for "regulator-initial-mode" and "regulator-mode" are: | |
| 39 | 1: Normal regulator voltage output mode. | |
| 40 | 3: Low Power which reduces the quiescent current down to only 1uA | |
| 41 | ||
| 42 | The list of valid modes are defined in the dt-bindings/clock/maxim,max77802.h | |
| 43 | header and can be included by device tree source files. | |
| 44 | ||
| 45 | The standard "regulator-mode" property can only be used for regulators that | |
| 46 | support changing their mode to Low Power Mode during suspend. These regulators | |
| 47 | are: BUCKs 2-4 and LDOs 1-35. Also, it only takes effect if the regulator has | |
| 48 | been enabled for the given suspend state using "regulator-on-in-suspend" and | |
| 49 | has not been disabled for that state using "regulator-off-in-suspend". | |
| 50 | ||
| 4ece7045 JMC |
51 | Example: |
| 52 | ||
| 53 | max77802@09 { | |
| 54 | compatible = "maxim,max77802"; | |
| 55 | interrupt-parent = <&wakeup_eint>; | |
| 56 | interrupts = <26 0>; | |
| 57 | reg = <0x09>; | |
| 58 | #address-cells = <1>; | |
| 59 | #size-cells = <0>; | |
| 60 | ||
| 61 | regulators { | |
| bf66c48d JMC |
62 | ldo1_reg: LDO1 { |
| 63 | regulator-name = "vdd_1v0"; | |
| 64 | regulator-min-microvolt = <1000000>; | |
| 65 | regulator-max-microvolt = <1000000>; | |
| 66 | regulator-always-on; | |
| 67 | regulator-initial-mode = <MAX77802_OPMODE_LP>; | |
| 68 | }; | |
| 69 | ||
| 4ece7045 JMC |
70 | ldo11_reg: LDO11 { |
| 71 | regulator-name = "vdd_ldo11"; | |
| 72 | regulator-min-microvolt = <1900000>; | |
| 73 | regulator-max-microvolt = <1900000>; | |
| 74 | regulator-always-on; | |
| bf66c48d JMC |
75 | regulator-state-mem { |
| 76 | regulator-on-in-suspend; | |
| 77 | regulator-mode = <MAX77802_OPMODE_LP>; | |
| 78 | }; | |
| 4ece7045 JMC |
79 | }; |
| 80 | ||
| 81 | buck1_reg: BUCK1 { | |
| 82 | regulator-name = "vdd_mif"; | |
| 83 | regulator-min-microvolt = <950000>; | |
| 84 | regulator-max-microvolt = <1300000>; | |
| 85 | regulator-always-on; | |
| 86 | regulator-boot-on; | |
| 87 | }; | |
| 88 | }; |