projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| a13c7c51 KK |
1 | Binding for Samsung S2M family regulator block |
| 2 | ============================================== | |
| 3 | ||
| 4 | This is a part of device tree bindings for S2M family multi-function devices. | |
| 5 | More information can be found in bindings/mfd/sec-core.txt file. | |
| 6 | ||
| 7 | The S2MPS11/13/14/15 and S2MPU02 devices provide buck and LDO regulators. | |
| 8 | ||
| 9 | To register these with regulator framework instantiate under main device node | |
| 10 | a sub-node named "regulators" with more sub-nodes for each regulator using the | |
| 11 | common regulator binding documented in: | |
| 12 | - Documentation/devicetree/bindings/regulator/regulator.txt | |
| 13 | ||
| 14 | ||
| 15 | Names of regulators supported by different devices: | |
| 16 | - LDOn | |
| 17 | - valid values for n are: | |
| 18 | - S2MPS11: 1 to 38 | |
| 19 | - S2MPS13: 1 to 40 | |
| 20 | - S2MPS14: 1 to 25 | |
| 21 | - S2MPS15: 1 to 27 | |
| 22 | - S2MPU02: 1 to 28 | |
| 23 | - Example: LDO1, LDO2, LDO28 | |
| 24 | - BUCKn | |
| 25 | - valid values for n are: | |
| 26 | - S2MPS11: 1 to 10 | |
| 27 | - S2MPS13: 1 to 10 | |
| 28 | - S2MPS14: 1 to 5 | |
| 29 | - S2MPS15: 1 to 10 | |
| 30 | - S2MPU02: 1 to 7 | |
| 31 | - Example: BUCK1, BUCK2, BUCK9 | |
| 32 | Note: The 'n' in LDOn and BUCKn represents the LDO or BUCK number | |
| 33 | as per the datasheet of device. | |
| 34 | ||
| 35 | ||
| 36 | Optional properties of the nodes under "regulators" sub-node: | |
| 37 | - regulator-ramp-delay: ramp delay in uV/us. May be 6250, 12500, | |
| 38 | 25000 (default) or 50000. | |
| 39 | ||
| 40 | Additionally S2MPS11 supports disabling ramp delay for BUCK{2,3,4,6} | |
| 41 | by setting it to <0>. | |
| 42 | ||
| 43 | Note: On S2MPS11 some bucks share the ramp rate setting i.e. same ramp value | |
| 44 | will be set for a particular group of bucks so provide the same | |
| 45 | regulator-ramp-delay value for them. | |
| 46 | Groups sharing ramp rate: | |
| 47 | - buck{1,6}, | |
| 48 | - buck{3,4}, | |
| 49 | - buck{7,8,10}. | |
| 50 | ||
| 51 | - samsung,ext-control-gpios: On S2MPS14 the LDO10, LDO11 and LDO12 can be | |
| 52 | configured to external control over GPIO. To turn this feature on this | |
| 53 | property must be added to the regulator sub-node: | |
| 54 | - samsung,ext-control-gpios: GPIO specifier for one GPIO | |
| 55 | controlling this regulator (enable/disable) | |
| 56 | Example: | |
| 57 | LDO12 { | |
| 58 | regulator-name = "V_EMMC_2.8V"; | |
| 59 | regulator-min-microvolt = <2800000>; | |
| 60 | regulator-max-microvolt = <2800000>; | |
| 61 | samsung,ext-control-gpios = <&gpk0 2 0>; | |
| 62 | }; | |
| 63 | ||
| 64 | ||
| 65 | Example: | |
| 66 | ||
| 67 | s2mps11_pmic@66 { | |
| 68 | compatible = "samsung,s2mps11-pmic"; | |
| 69 | reg = <0x66>; | |
| 70 | ||
| 71 | regulators { | |
| 72 | ldo1_reg: LDO1 { | |
| 73 | regulator-name = "VDD_ABB_3.3V"; | |
| 74 | regulator-min-microvolt = <3300000>; | |
| 75 | regulator-max-microvolt = <3300000>; | |
| 76 | }; | |
| 77 | ||
| 78 | ldo2_reg: LDO2 { | |
| 79 | regulator-name = "VDD_ALIVE_1.1V"; | |
| 80 | regulator-min-microvolt = <1100000>; | |
| 81 | regulator-max-microvolt = <1100000>; | |
| 82 | regulator-always-on; | |
| 83 | }; | |
| 84 | ||
| 85 | buck1_reg: BUCK1 { | |
| 86 | regulator-name = "vdd_mif"; | |
| 87 | regulator-min-microvolt = <950000>; | |
| 88 | regulator-max-microvolt = <1350000>; | |
| 89 | regulator-always-on; | |
| 90 | regulator-boot-on; | |
| 91 | }; | |
| 92 | ||
| 93 | buck2_reg: BUCK2 { | |
| 94 | regulator-name = "vdd_arm"; | |
| 95 | regulator-min-microvolt = <950000>; | |
| 96 | regulator-max-microvolt = <1350000>; | |
| 97 | regulator-always-on; | |
| 98 | regulator-boot-on; | |
| 99 | regulator-ramp-delay = <50000>; | |
| 100 | }; | |
| 101 | }; | |
| 102 | }; |