Add bindings for the LTC4282 High Current Hot Swap Controller with I2C Compatible Monitoring. Signed-off-by: Nuno Sa <nuno.sa@xxxxxxxxxx> --- .../bindings/hwmon/adi,ltc4282.yaml | 228 ++++++++++++++++++ MAINTAINERS | 6 + 2 files changed, 234 insertions(+) create mode 100644 Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml diff --git a/Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml b/Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml new file mode 100644 index 000000000000..0a5d540f014e --- /dev/null +++ b/Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml @@ -0,0 +1,228 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/hwmon/adi,ltc4282.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C + +maintainers: + - Nuno Sa <nuno.sa@xxxxxxxxxx> + +description: | + Analog Devices LTC4282 I2C High Current Hot Swap Controller over I2C. + + https://www.analog.com/media/en/technical-documentation/data-sheets/ltc4282.pdf + + +properties: + compatible: + enum: + - adi,ltc4282 + + reg: + maxItems: 1 + + vdd-supply: true + + clocks: + maxItems: 1 + + adi,clkout-mode: + description: | + Controls in which mode the CLKOUT PIN should work: + 0 - Configures the CLKOUT pin to output the internal system clock + 1 - Configures the CLKOUT pin to output the internal conversion time + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1] + + adi,rsense-nano-ohms: + description: Value of the sense resistor. + + adi,vin-mode-microvolt: + description: + Selects operating range for the Undervoltage, Overvoltage and Foldback + pins. Also for the ADC. Should be set to the nominal input voltage. + enum: [3300000, 5000000, 12000000, 24000000] + default: 12000000 + + adi,fet-bad-timeout-ms: + description: + From the moment a FET bad conditions is present, this property selects the + wait time/timeout for a FET-bad fault to be signaled. Setting this to 0, + disables FET bad faults to be reported. + default: 255 + maximum: 255 + + adi,overvoltage-dividers: + description: | + Select which dividers to use for VDD Overvoltage detection. Note that + when the internal dividers are used the threshold is referenced to VDD. + The percentages in the datasheet are misleading since the actual values + to look for are in the "Absolute Maximum Ratings" table in the + "Comparator Inputs" section. In there there's a line for each of the 5%, + 10% and 15% settings with the actual min, typical and max tolerances. + 0 - Use the external dividers. + 1 - Internal dividers 5% + 2 - Internal dividers 10% + 3 - Internal dividers 15% + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1, 2, 3] + default: 0 + + adi,undervoltage-dividers: + description: | + Select which dividers to use for VDD Overvoltage detection. Note that + when the internal dividers are used the threshold is referenced to VDD. + The percentages in the datasheet are misleading since the actual values + to look for are in the "Absolute Maximum Ratings" table in the + "Comparator Inputs" section. In there there's a line for each of the 5%, + 10% and 15% settings with the actual min, typical and max tolerances. + 0 - Use the external dividers. + 1 - Internal dividers 5% + 2 - Internal dividers 10% + 3 - Internal dividers 15% + $ref: /schemas/types.yaml#/definitions/uint32 + enum: [0, 1, 2, 3] + default: 0 + + adi,current-limit-microvolt: + description: + The current limit sense voltage of the chip is adjustable between + 12.5mV and 34.4mV in 3.1mV steps. This effectively limits the current + on the load. + enum: [12500, 15625, 18750, 21875, 25000, 28125, 31250, 34375] + default: 25000 + + adi,overcurrent-retry: + description: + If set, enables the chip to auto-retry 256 timer cycles after an + Overcurrent fault. + type: boolean + + adi,overvoltage-retry-disable: + description: + If set, disables the chip to auto-retry 50ms after an Overvoltage fault. + It's enabled by default. + type: boolean + + adi,undervoltage-retry-disable: + description: + If set, disables the chip to auto-retry 50ms after an Undervoltage fault. + It's enabled by default. + type: boolean + + adi,fault-log-enable: + description: + If set, enables the FAULT_LOG and ADC_ALERT_LOG registers to be written + to the EEPROM when a fault bit transitions high and hence, will be + available after a power cycle (the chip loads the contents of + the EE_FAULT_LOG register - the one in EEPROM - into FAULT_LOG at boot). + type: boolean + + adi,gpio-alert: + description: Use the ALERT pin as a GPIO. + type: boolean + + adi,gpio1-mode: + description: | + Defines the function of the Pin. + 0 - GPIO Mode. + 1 - Power Bad. Goes into high-z to indicate that the output power is + no longer good. + 2 - Power Good. Pulls low to indicate that the output power is no + longer good. + $ref: /schemas/types.yaml#/definitions/uint32 + maximum: 2 + + adi,gpio2-mode: + description: | + Defines the function of the Pin. + 0 - GPIO Mode. + 1 - Acts as an input pin and it is feeded into the ADC. + 2 - Pulls Low when the MOSFET is dissipating power (stress). + $ref: /schemas/types.yaml#/definitions/uint32 + maximum: 2 + + adi,gpio3-mode: + description: | + Defines the function of the Pin. + 0 - GPIO Mode. + 1 - Acts as an input pin and it is feeded into the ADC. + $ref: /schemas/types.yaml#/definitions/uint32 + maximum: 1 + + gpio-controller: + description: + This property applies if some of the pins are used as GPIOs. + + '#gpio-cells': + const: 2 + +required: + - compatible + - reg + - adi,rsense-nano-ohms + +dependencies: + adi,alert-as-gpio: [gpio-controller, '#gpio-cells'] + +allOf: + - if: + required: + - adi,gpio1-mode + then: + allOf: + - if: + properties: + adi,gpio0-mode: + const: 0 + then: + dependencies: + adi,gpio0-mode: [gpio-controller, '#gpio-cells'] + - if: + required: + - adi,gpio2-mode + then: + allOf: + - if: + properties: + adi,gpio1-mode: + const: 0 + then: + dependencies: + adi,gpio1-mode: [gpio-controller, '#gpio-cells'] + - if: + required: + - adi,gpio3-mode + then: + allOf: + - if: + properties: + adi,gpio2-mode: + const: 0 + then: + dependencies: + adi,gpio2-mode: [gpio-controller, '#gpio-cells'] + +additionalProperties: false + +examples: + - | + i2c { + #address-cells = <1>; + #size-cells = <0>; + + hwmon@50 { + compatible = "adi,ltc4282"; + reg = <0x50>; + adi,rsense-nano-ohms = <500>; + + gpio-controller; + #gpio-cells = <2>; + + adi,gpio1-mode = <2>; + adi,gpio2-mode = <0>; + }; + }; +... diff --git a/MAINTAINERS b/MAINTAINERS index 43121073390c..9f9527f6057b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -12481,6 +12481,12 @@ S: Maintained F: Documentation/hwmon/ltc4261.rst F: drivers/hwmon/ltc4261.c +LTC4282 HARDWARE MONITOR DRIVER +M: Nuno Sa <nuno.sa@xxxxxxxxxx> +L: linux-hwmon@xxxxxxxxxxxxxxx +S: Supported +F: Documentation/devicetree/bindings/hwmon/adi,ltc4282.yaml + LTC4306 I2C MULTIPLEXER DRIVER M: Michael Hennerich <michael.hennerich@xxxxxxxxxx> L: linux-i2c@xxxxxxxxxxxxxxx -- 2.42.1
