Tom Rini | 6bb92fc | 2024-05-20 09:54:58 -0600 | [diff] [blame] | 1 | # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| 2 | %YAML 1.2 |
| 3 | --- |
| 4 | $id: http://devicetree.org/schemas/hwmon/adi,ltc4282.yaml# |
| 5 | $schema: http://devicetree.org/meta-schemas/core.yaml# |
| 6 | |
| 7 | title: Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C |
| 8 | |
| 9 | maintainers: |
| 10 | - Nuno Sa <nuno.sa@analog.com> |
| 11 | |
| 12 | description: | |
| 13 | Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C. |
| 14 | |
| 15 | https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4282.pdf |
| 16 | |
| 17 | properties: |
| 18 | compatible: |
| 19 | enum: |
| 20 | - adi,ltc4282 |
| 21 | |
| 22 | reg: |
| 23 | maxItems: 1 |
| 24 | |
| 25 | vdd-supply: true |
| 26 | |
| 27 | clocks: |
| 28 | maxItems: 1 |
| 29 | |
| 30 | '#clock-cells': |
| 31 | const: 0 |
| 32 | |
| 33 | adi,rsense-nano-ohms: |
| 34 | description: Value of the sense resistor. |
| 35 | |
| 36 | adi,vin-mode-microvolt: |
| 37 | description: |
| 38 | Selects operating range for the Undervoltage, Overvoltage and Foldback |
| 39 | pins. Also for the ADC. Should be set to the nominal input voltage. |
| 40 | enum: [3300000, 5000000, 12000000, 24000000] |
| 41 | default: 12000000 |
| 42 | |
| 43 | adi,fet-bad-timeout-ms: |
| 44 | description: |
| 45 | From the moment a FET bad conditions is present, this property selects the |
| 46 | wait time/timeout for a FET-bad fault to be signaled. Setting this to 0, |
| 47 | disables FET bad faults to be reported. |
| 48 | default: 255 |
| 49 | maximum: 255 |
| 50 | |
| 51 | adi,overvoltage-dividers: |
| 52 | description: | |
| 53 | Select which dividers to use for VDD Overvoltage detection. Note that |
| 54 | when the internal dividers are used the threshold is referenced to VDD. |
| 55 | The percentages in the datasheet are misleading since the actual values |
| 56 | to look for are in the "Absolute Maximum Ratings" table in the |
| 57 | "Comparator Inputs" section. In there there's a line for each of the 5%, |
| 58 | 10% and 15% settings with the actual min, typical and max tolerances. |
| 59 | $ref: /schemas/types.yaml#/definitions/string |
| 60 | enum: [external, vdd_5_percent, vdd_10_percent, vdd_15_percent] |
| 61 | default: external |
| 62 | |
| 63 | adi,undervoltage-dividers: |
| 64 | description: | |
| 65 | Select which dividers to use for VDD Overvoltage detection. Note that |
| 66 | when the internal dividers are used the threshold is referenced to VDD. |
| 67 | The percentages in the datasheet are misleading since the actual values |
| 68 | to look for are in the "Absolute Maximum Ratings" table in the |
| 69 | "Comparator Inputs" section. In there there's a line for each of the 5%, |
| 70 | 10% and 15% settings with the actual min, typical and max tolerances. |
| 71 | $ref: /schemas/types.yaml#/definitions/string |
| 72 | enum: [external, vdd_5_percent, vdd_10_percent, vdd_15_percent] |
| 73 | default: external |
| 74 | |
| 75 | adi,current-limit-sense-microvolt: |
| 76 | description: |
| 77 | The current limit sense voltage of the chip is adjustable between |
| 78 | 12.5mV and 34.4mV in 3.1mV steps. This effectively limits the current |
| 79 | on the load. |
| 80 | enum: [12500, 15625, 18750, 21875, 25000, 28125, 31250, 34375] |
| 81 | default: 25000 |
| 82 | |
| 83 | adi,overcurrent-retry: |
| 84 | description: |
| 85 | If set, enables the chip to auto-retry 256 timer cycles after an |
| 86 | Overcurrent fault. |
| 87 | type: boolean |
| 88 | |
| 89 | adi,overvoltage-retry-disable: |
| 90 | description: |
| 91 | If set, disables the chip to auto-retry 50ms after an Overvoltage fault. |
| 92 | It's enabled by default. |
| 93 | type: boolean |
| 94 | |
| 95 | adi,undervoltage-retry-disable: |
| 96 | description: |
| 97 | If set, disables the chip to auto-retry 50ms after an Undervoltage fault. |
| 98 | It's enabled by default. |
| 99 | type: boolean |
| 100 | |
| 101 | adi,fault-log-enable: |
| 102 | description: |
| 103 | If set, enables the FAULT_LOG and ADC_ALERT_LOG registers to be written |
| 104 | to the EEPROM when a fault bit transitions high and hence, will be |
| 105 | available after a power cycle (the chip loads the contents of |
| 106 | the EE_FAULT_LOG register - the one in EEPROM - into FAULT_LOG at boot). |
| 107 | type: boolean |
| 108 | |
| 109 | adi,gpio1-mode: |
| 110 | description: Defines the function of the Pin. It can indicate that power is |
| 111 | good (PULL the pin low when power is not good) or that power is bad (Go |
| 112 | into high-z when power is not good). |
| 113 | $ref: /schemas/types.yaml#/definitions/string |
| 114 | enum: [power_bad, power_good] |
| 115 | default: power_good |
| 116 | |
| 117 | adi,gpio2-mode: |
| 118 | description: Defines the function of the Pin. It can be set as the input for |
| 119 | the ADC or indicating that the MOSFET is in stress (dissipating power). |
| 120 | $ref: /schemas/types.yaml#/definitions/string |
| 121 | enum: [adc_input, stress_fet] |
| 122 | default: adc_input |
| 123 | |
| 124 | adi,gpio3-monitor-enable: |
| 125 | description: If set, gpio3 is set as input for the ADC instead of gpio2. |
| 126 | type: boolean |
| 127 | |
| 128 | allOf: |
| 129 | - if: |
| 130 | required: |
| 131 | - adi,gpio3-monitor-enable |
| 132 | then: |
| 133 | properties: |
| 134 | adi,gpio2-mode: |
| 135 | const: stress_fet |
| 136 | |
| 137 | required: |
| 138 | - compatible |
| 139 | - reg |
| 140 | - adi,rsense-nano-ohms |
| 141 | |
| 142 | additionalProperties: false |
| 143 | |
| 144 | examples: |
| 145 | - | |
| 146 | i2c { |
| 147 | #address-cells = <1>; |
| 148 | #size-cells = <0>; |
| 149 | |
| 150 | hwmon@50 { |
| 151 | compatible = "adi,ltc4282"; |
| 152 | reg = <0x50>; |
| 153 | adi,rsense-nano-ohms = <500>; |
| 154 | |
| 155 | adi,gpio1-mode = "power_good"; |
| 156 | adi,gpio2-mode = "adc_input"; |
| 157 | }; |
| 158 | }; |
| 159 | ... |