| Javier Martinez Canillas | aa60a83 | 2015-08-24 10:47:21 +0200 | [diff] [blame] | 1 | Binding for Maxim MAX77686 regulators |
| 2 | |
| 3 | This is a part of the device tree bindings of MAX77686 multi-function device. |
| 4 | More information can be found in ../mfd/max77686.txt file. |
| 5 | |
| 6 | The MAX77686 PMIC has 9 high-efficiency Buck and 26 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 | - voltage-regulators : The regulators of max77686 have to be instantiated |
| 13 | under subnode named "voltage-regulators" using the following format. |
| 14 | |
| 15 | regulator_name { |
| 16 | regulator-compatible = LDOn/BUCKn |
| 17 | standard regulator constraints.... |
| 18 | }; |
| 19 | refer Documentation/devicetree/bindings/regulator/regulator.txt |
| 20 | |
| 21 | The regulator node's name should be initialized with a string |
| 22 | to get matched with their hardware counterparts as follow: |
| 23 | |
| 24 | -LDOn : for LDOs, where n can lie in range 1 to 26. |
| 25 | example: LDO1, LDO2, LDO26. |
| 26 | -BUCKn : for BUCKs, where n can lie in range 1 to 9. |
| 27 | example: BUCK1, BUCK5, BUCK9. |
| 28 | |
| 29 | Regulators which can be turned off during system suspend: |
| 30 | -LDOn : 2, 6-8, 10-12, 14-16, |
| 31 | -BUCKn : 1-4. |
| 32 | Use standard regulator bindings for it ('regulator-off-in-suspend'). |
| 33 | |
| 34 | LDO20, LDO21, LDO22, BUCK8 and BUCK9 can be configured to GPIO enable |
| 35 | control. To turn this feature on this property must be added to the regulator |
| 36 | sub-node: |
| 37 | - maxim,ena-gpios : one GPIO specifier enable control (the gpio |
| 38 | flags are actually ignored and always |
| 39 | ACTIVE_HIGH is used) |
| 40 | |
| 41 | Example: |
| 42 | |
| 43 | max77686: pmic@09 { |
| 44 | compatible = "maxim,max77686"; |
| 45 | interrupt-parent = <&wakeup_eint>; |
| 46 | interrupts = <26 IRQ_TYPE_NONE>; |
| 47 | reg = <0x09>; |
| 48 | |
| 49 | voltage-regulators { |
| 50 | ldo11_reg: LDO11 { |
| 51 | regulator-name = "vdd_ldo11"; |
| 52 | regulator-min-microvolt = <1900000>; |
| 53 | regulator-max-microvolt = <1900000>; |
| 54 | regulator-always-on; |
| 55 | }; |
| 56 | |
| 57 | buck1_reg: BUCK1 { |
| 58 | regulator-name = "vdd_mif"; |
| 59 | regulator-min-microvolt = <950000>; |
| 60 | regulator-max-microvolt = <1300000>; |
| 61 | regulator-always-on; |
| 62 | regulator-boot-on; |
| 63 | }; |
| 64 | |
| 65 | buck9_reg: BUCK9 { |
| 66 | regulator-name = "CAM_ISP_CORE_1.2V"; |
| 67 | regulator-min-microvolt = <1000000>; |
| 68 | regulator-max-microvolt = <1200000>; |
| 69 | maxim,ena-gpios = <&gpm0 3 GPIO_ACTIVE_HIGH>; |
| 70 | }; |
| 71 | }; |